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Autore: Grafiati

Pubblicato: 1 giugno 2024

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1

Kiselev, Alexei D., Ali Ranim e Andrei V. Rybin. "Speed of Evolution and Correlations in Multi-Mode Bosonic Systems". Entropy 24, n. 12 (5 dicembre 2022): 1774. http://dx.doi.org/10.3390/e24121774.

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We employ an exact solution of the thermal bath Lindblad master equation with the Liouvillian superoperator that takes into account both dynamic and environment-induced intermode couplings to study the speed of evolution and quantum speed limit (QSL) times of a open multi-mode bosonic system. The time-dependent QSL times are defined from quantum speed limits, giving upper bounds on the rate of change of two different measures of distinguishability: the fidelity of evolution and the Hilbert–Schmidt distance. For Gaussian states, we derive explicit expressions for the evolution speed and the QSL times. General analytical results are applied to the special case of a two-mode system where the intermode couplings can be characterized by two intermode coupling vectors: the frequency vector and the relaxation rate vector. For the system initially prepared in a two-mode squeezed state, dynamical regimes are generally determined by the intermode coupling vectors, the squeezing parameter and temperature. When the vectors are parallel, different regimes may be associated with the disentanglement time, which is found to be an increasing (a decreasing) function of the length of the relaxation vector when the squeezing parameter is below (above) its temperature-dependent critical value. Alternatively, we study dynamical regimes related to the long-time asymptotic behavior of the QSL times, which is characterized by linear time dependence with the proportionality coefficients defined as the long-time asymptotic ratios. These coefficients are evaluated as a function of the squeezing parameter at varying temperatures and relaxation vector lengths. We also discuss how the magnitude and orientation of the intermode coupling vectors influence the maximum speed of evolution and dynamics of the entropy and the mutual information.

2

Hassanabadi, Hassan, e Antonio Soares de Castro. "Bound States of Spinless Particles in a Short-Range Potential". Zeitschrift für Naturforschung A 70, n. 4 (1 aprile 2015): 245–49. http://dx.doi.org/10.1515/zna-2015-0025.

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AbstractWith a general mixing of vector and scalar couplings in a two-dimensional world, a short-range potential is used to explore certain features of the bound states of a spinless particle. Bound-state solutions are found in terms of the Gauss hypergeometric series when the potential parameters obey a certain constraint relation limiting the dosage of a vector coupling. The appearance of the Schiff–Snyder–Weinberg effect for a strong vector coupling and a short-range potential as well as its suppression by the addition of a scalar coupling is discussed.

3

Kevrekidis, P. G., e D. E. Pelinovsky. "Discrete vector on-site vortices". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 462, n. 2073 (4 aprile 2006): 2671–94. http://dx.doi.org/10.1098/rspa.2006.1693.

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We study discrete vortices in coupled discrete nonlinear Schrödinger equations. We focus on the vortex cross configuration that has been experimentally observed in photorefractive crystals. Stability of the single-component vortex cross in the anti-continuum limit of small coupling between lattice nodes is proved. In the vector case, we consider two coupled configurations of vortex crosses, namely the charge-one vortex in one component coupled in the other component to either the charge-one vortex (forming a double-charge vortex) or the charge-negative-one vortex (forming a, so-called, hidden-charge vortex). We show that both vortex configurations are stable in the anti-continuum limit, if the parameter for the inter-component coupling is small and both of them are unstable when the coupling parameter is large. In the marginal case of the discrete two-dimensional Manakov system, the double-charge vortex is stable while the hidden-charge vortex is linearly unstable. Analytical predictions are corroborated with numerical observations that show good agreement near the anti-continuum limit, but gradually deviate for larger couplings between the lattice nodes.

4

Krasnikov, N. V. "Implications of last NA64 results and the electron ge − 2 anomaly for the X(16.7) boson survival". Modern Physics Letters A 35, n. 15 (12 marzo 2020): 2050116. http://dx.doi.org/10.1142/s0217732320501163.

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We point out that last NA64 bound on coupling constant of hypothetical X[Formula: see text](16.7 MeV) vector boson with electrons plus the recent value of the anomalous electron magnetic moment exclude at 90% C.L. purely vector or axial–vector couplings of X[Formula: see text](16.7) boson with electrons. Models with nonzero [Formula: see text] coupling constant with electron survive and they can explain both the electron and muon [Formula: see text] anomalies.

5

Makri, Nancy. "Topological aspects of system-bath Hamiltonians and a vector model for multisite systems coupled to local, correlated, or common baths". Journal of Chemical Physics 158, n. 14 (14 aprile 2023): 144107. http://dx.doi.org/10.1063/5.0147135.

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Some topological features of multisite Hamiltonians consisting of harmonic potential surfaces with constant site-to-site couplings are discussed. Even in the absence of Duschinsky rotation, such a Hamiltonian assumes the system-bath form only if severe constraints exist. The simplest case of a common bath that couples to all sites is realized when the potential minima are collinear. The bath reorganization energy increases quadratically with site distance in this case. Another frequently encountered situation involves exciton-vibration coupling in molecular aggregates, where the intramolecular normal modes of the monomers give rise to local harmonic potentials. In this case, the reorganization energy accompanying excitation transfer is independent of site-to-site separation, thus this situation cannot be described by the usual system-bath Hamiltonian. A vector system-bath representation is introduced, which brings the exciton-vibration Hamiltonian in system-bath form. In this, the system vectors specify the locations of the potential minima, which in the case of identical monomers lie on the vertices of a regular polyhedron. By properly choosing the system vectors, it is possible to couple each bath to one or more sites and to specify the desired initial density. With a collinear choice of system vectors, the coupling reverts to the simple form of a common bath. The compact form of the vector system-bath coupling generalizes the dissipative tight-binding model to account for local, correlated, and common baths. The influence functional for the vector system-bath Hamiltonian is obtained in a compact and simple form.

6

KIM, HYUN-CHUL, TIM LEDWIG e KLAUS GOEKE. "VECTOR AND AXIAL-VECTOR STRUCTURES OF THE Θ+". Modern Physics Letters A 23, n. 27n30 (30 settembre 2008): 2238–41. http://dx.doi.org/10.1142/s0217732308029101.

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We present in this talk recent results of the vector and axial-vector transitions of the nucleon to the pentaquark baryon Θ+, based on the SU(3) chiral quark-soliton model. The results are summarized as follows: K*NΘ vector and tensor coupling constants turn out to be gK*NΘ ≃ 0.81 and fK*NΘ ≃ 0.84, respectively, and the KNΘ axial-vector coupling constant to be [Formula: see text]. As a result, the total decay width for Θ+ → NK becomes very small: ΓΘ→NK ≃ 0.71 MeV , which is consistent with the DIANA result ΓΘ→NK = 0.36 ± 0.11 MeV .

7

DELBOURGO, R., e M. D. SCADRON. "DYNAMICAL GENERATION OF THE GAUGED SU(2) LINEAR SIGMA MODEL". Modern Physics Letters A 10, n. 03 (30 gennaio 1995): 251–66. http://dx.doi.org/10.1142/s0217732395000284.

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The fermion and meson sectors of the quark-level SU(2) linear sigma model are dynamically generated from a meson–quark Lagrangian, with the quark (q) and meson (σ, π) fields all treated as elementary, having neither bare masses nor expectation values. In the chiral limit, the masses are predicted to be mq = fπg, mπ = 0, mσ = 2mq, and we also find that the quark–meson coupling is [Formula: see text], the three-meson coupling is [Formula: see text] and the four-meson coupling is λ = 2g2 = g′/fπ, where fπ ≃ 90 MeV is the pion decay constant and Nc = 3 is the color number. By gauging this model one can generate the couplings to the vector mesons ρ and A1, including the quark–vector coupling constant gρ = 2π, gρππ, gA1ρπ and the masses mρ ~ 700 MeV, [Formula: see text]; of course the vector and axial currents remain conserved throughout.

8

Jaminon, M., e R. Mendez-Galain. "Effect of the vector-axial-vector coupling on the vector-meson modes". Nuclear Physics A 564, n. 4 (novembre 1993): 542–50. http://dx.doi.org/10.1016/0375-9474(93)90212-g.

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9

Lahiri, Amitabha. "Vector–Tensor Duality". Modern Physics Letters A 12, n. 35 (20 novembre 1997): 2699–705. http://dx.doi.org/10.1142/s0217732397002831.

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A dynamical non-Abelian two-form potential gives masses to vector bosons via a topological coupling.1 Unlike in the Abelian case, the two-form cannot be dualized to Goldstone bosons. Duality is restored by coupling a flat connection to the theory in a particular way, and the new action is then dualized to a nonlinear sigma model. The presence of the flat connection is crucial, which saves the original mechanism of Higgs-free topological mass generation from being dualized to a sigma model.

10

Zhang, Hong-Yi, e Siyang Ling. "Phenomenology of wavelike vector dark matter nonminimally coupled to gravity". Journal of Cosmology and Astroparticle Physics 2023, n. 07 (1 luglio 2023): 055. http://dx.doi.org/10.1088/1475-7516/2023/07/055.

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Abstract We study three astrophysical/cosmological consequences of nonminimal couplings to gravity in wavelike vector dark matter. In the nonrelativistic limit, the nonminimal coupling with the lowest mass dimension leads to effective self-interactions that affect the mass-radius relation of vector solitons, growth of linear perturbations during structure formation, and the speed of gravitational waves (GWs). Based on the success of cold dark matter on large-scale perturbations and the current limits on GW speed, we constrain the dark matter mass and nonminimal coupling strength to be within the range |ξ 1|/m 2 ≪ 1050 eV-2 and -3 × 1046 eV-2 ≲ ξ 2/m 2 ≲ 8 × 1048 eV-2.

11

Weinberg, Steven. "Axial vector coupling of the quark". Physical Review Letters 67, n. 25 (16 dicembre 1991): 3473–74. http://dx.doi.org/10.1103/physrevlett.67.3473.

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12

MARTÍNEZ, AURORA PÉREZ, HUGO PÉREZ ROJAS, DARYEL MANREZA PARET, ALEXANDRE MESQUITA, MOISÉS RAZEIRA, CÉSAR A. Z. VASCONCELLOS, ROSANA O. GOMES e DIMITER HADJIMICHEF. "A RELATIVISTIC EFFECTIVE MODEL WITH PARAMETERIZED COUPLINGS FOR NEUTRON STARS". International Journal of Modern Physics E 20, supp01 (dicembre 2011): 230–36. http://dx.doi.org/10.1142/s021830131104030x.

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We present a relativistic effective model with derivative couplings which includes genuine many-body forces simulated by nonlinear interaction terms involving scalar-isoscalar (σ, σ*), vector-isoscalar (ω, ɸ), vector-isovector (ϱ), scalar-isovector (δ) mesons. The effective model presented in this work has a philosophy quite similar to the original version of the model with parameterized couplings. But unlike that, in which the parametrization is directly inserted in the coupling constants of the Glendenning model, we present here a method for the derivation of the parametric dependence of the coupling terms, in a way that allows in one side to consistently justify this parametrization and in the other to extend in a coherent way the range of possibilities of parameterizations in effective models with derivative couplings. The extended model is then applied to the description of the mass of neutron stars.

13

MESQUITA, ALEXANDRE, MOISÉS RAZEIRA, DIMITER HADJIMICHEF, CÉSAR A. Z. VASCONCELLOS, ROSANA O. GOMES, AURORA PÉREZ MARTÍNEZ, HUGO PÉREZ ROJAS e DARYEL MANREZA PARET. "A RELATIVISTIC EFFECTIVE MODEL WITH PARAMETERIZED COUPLINGS FOR NEUTRON STARS: THE ROLE OF ANTIKAON CONDENSATES". International Journal of Modern Physics E 20, supp02 (dicembre 2011): 133–39. http://dx.doi.org/10.1142/s0218301311040700.

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We study the effects of antikaon condensates in neutron stars in the framework of a relativistic effective model with derivative couplings which includes genuine many-body forces simulated by nonlinear interaction terms involving scalar-isoscalar (σ, σ*), vector-isoscalar (ω, ɸ), vector-isovector (ϱ), scalar-isovector (δ) mesons. The effective model presented in this work has a philosophy quite similar to the original version of the model with parameterized couplings. But unlike that, in which the parametrization is directly inserted in the coupling constants of the Glendenning model, we present here a method for the derivation of the parametric dependence of the coupling terms, in a way that allows in one side to consistently justify this parametrization and in the other to extend in a coherent way the range of possibilities of parameterizations in effective models with derivative couplings. The extended model is then applied to the description of the mass of neutron stars.

14

Ali, Tarek Sayed Taha. "Determination of the Axial-Vector Coupling Constant from the Extended Linear Sigma Model". International Journal of Applied Physics and Mathematics 4, n. 3 (2014): 184–87. http://dx.doi.org/10.7763/ijapm.2014.v4.280.

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15

Chen, Ningyuan, e Mariana Olvera-Cravioto. "Coupling on weighted branching trees". Advances in Applied Probability 48, n. 2 (giugno 2016): 499–524. http://dx.doi.org/10.1017/apr.2016.12.

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Abstract In this paper we consider linear functions constructed on two different weighted branching processes and provide explicit bounds for their Kantorovich–Rubinstein distance in terms of couplings of their corresponding generic branching vectors. Motivated by applications to the analysis of random graphs, we also consider a variation of the weighted branching process where the generic branching vector has a different dependence structure from the usual one. By applying the bounds to sequences of weighted branching processes, we derive sufficient conditions for the convergence in the Kantorovich–Rubinstein distance of linear functions. We focus on the case where the limits are endogenous fixed points of suitable smoothing transformations.

16

Adamuščín, Cyril, Erik Bartoš, Stanislav Dubnička e Anna Z. Dubničková. "There is only one set of the correct values of fF, fD and fS coupling constants in SU(3) invariant Lagrangian of the vector-meson-baryon interactions". EPJ Web of Conferences 199 (2019): 02024. http://dx.doi.org/10.1051/epjconf/201919902024.

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One can prove, there is generally eight various ω − ø mixings forms in elementary particle physics, which on one side give different forms of the vector-meson-nucleon coupling constants through fF, fD and fS in SU(3) invariant Lagrangian of the vector-meson-baryon interactions, and on the other side different signs of the universal vector-meson coupling constants fρ, fω and fø. Identical set of numerical values of fF, fD and fS is evaluated only in that case, if the same ω − ø mixing is applied to a derivation of the vectormeson-nucleon coupling constant forms and also to the signs of the universal vector-meson coupling constants fρ, fω and fø.

17

Wang, Lanmei, Guibao Wang e Cao Zeng. "MUTUAL COUPLING CALIBRATION FOR ELECTROMAGNETIC VECTOR SENSOR". Progress In Electromagnetics Research B 52 (2013): 347–62. http://dx.doi.org/10.2528/pierb13042004.

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18

Maekawa, Nobuhiro. "Vector-Like Strong Coupling Theory with SmallSandTParameters". Progress of Theoretical Physics Supplement 123 (1996): 37–47. http://dx.doi.org/10.1143/ptps.123.37.

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19

Takeuchi, Ryushi, Yuichi Kozawa e Shunichi Sato. "Polarization coupling of vector Bessel–Gaussian beams". Journal of Optics 15, n. 7 (12 giugno 2013): 075710. http://dx.doi.org/10.1088/2040-8978/15/7/075710.

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20

Kammeraad, Joshua A., e Paul M. Zimmerman. "Estimating the Derivative Coupling Vector Using Gradients". Journal of Physical Chemistry Letters 7, n. 24 (30 novembre 2016): 5074–79. http://dx.doi.org/10.1021/acs.jpclett.6b02501.

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21

Park, Tae-Sun, Hong Jung e Dong-Pil Min. "In-medium effective axial-vector coupling constant". Physics Letters B 409, n. 1-4 (settembre 1997): 26–32. http://dx.doi.org/10.1016/s0370-2693(97)00880-0.

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22

Murayama, H., e Y. Sumino. "Axial-vector-coupling contribution to toponium resonances". Physical Review D 47, n. 1 (1 gennaio 1993): 82–92. http://dx.doi.org/10.1103/physrevd.47.82.

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23

Bastero-Gil, Mar, e António Torres Manso. "Parity violating gravitational waves at the end of inflation". Journal of Cosmology and Astroparticle Physics 2023, n. 08 (1 agosto 2023): 001. http://dx.doi.org/10.1088/1475-7516/2023/08/001.

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Abstract Inflaton-vector interactions of the type ϕFF̃ have provided interesting phenomenology to tackle some of current problems in cosmology, namely the vectors could constitute the dark matter component. It could also lead to possible signatures imprinted in a gravitational wave spectrum. Through this coupling, a rolling inflaton induces an exponential production of the transverse polarizations of the vector field, having a maximum at the end of inflation when the inflaton field velocity is at its maximum. These gauge particles, already parity asymmetric, will source the tensor components of the metric perturbations, leading to the production of parity violating gravitational waves. In this work we examine the vector particle production in the weak coupling regime, integrating the gauge mode amplitudes spectrum during the entirety of its production and amplification epochs, until the onset of radiation domination. Finally, we calculate the gravitational wave spectrum combining the vector mode analytical solution, the WKB expansion, valid only during the amplification until horizon crossing, and the numerical solution obtained at the beginning of radiation domination when the modes cease to grow.

24

LUO, LIN, WEN-XIU MA e EN-GUI FAN. "THE ALGEBRAIC STRUCTURE OF ZERO CURVATURE REPRESENTATIONS ASSOCIATED WITH INTEGRABLE COUPLINGS". International Journal of Modern Physics A 23, n. 09 (10 aprile 2008): 1309–25. http://dx.doi.org/10.1142/s0217751x08039347.

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The commutator of enlarged vector fields was explicitly computed for integrable coupling systems associated with semidirect sums of Lie algebras. An algebraic structure of zero curvature representations is then established for such integrable coupling systems. As an application example of this algebraic structure, the commutation relations of Lax operators corresponding to the enlarged isospectral and nonisospectral AKNS flows are worked out, and thus a τ-symmetry algebra for the AKNS integrable couplings is engendered from this theory.

25

NEUMEIER, S., e M. KIRCHBACH. "ON THE η and f1(1420) COUPLINGS TO THE NUCLEON". International Journal of Modern Physics A 15, n. 27 (30 ottobre 2000): 4325–39. http://dx.doi.org/10.1142/s0217751x00002391.

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We consider neutral pseudoscalar, η, and axial vector, f1(1420), mesons in the OZI-rule-respecting flavor basis, [Formula: see text], and suggest a scenario for their coupling to the nucleon. Within this framework, the nonstrange parts of the ηN and f1N couplings are modeled by means of triangular a0πN, and KK*(Λ/Σ) vertices, while the strange ones partly proceed via Goldberger–Treiman relations, which have been concluded solely on the grounds of current universality. The suggested model explains the observed suppression of the ηN coupling with respect to the constituent quark model expectations, and predicts the coupling of f1with the nucleon.

26

Moskvin, Alexander. "Dzyaloshinskii–Moriya Coupling in 3d Insulators". Condensed Matter 4, n. 4 (12 ottobre 2019): 84. http://dx.doi.org/10.3390/condmat4040084.

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We present an overview of the microscopic theory of the Dzyaloshinskii–Moriya (DM) coupling in strongly correlated 3d compounds. Most attention in the paper centers around the derivation of the Dzyaloshinskii vector, its value, orientation, and sense (sign) under different types of the (super)exchange interaction and crystal field. We consider both the Moriya mechanism of the antisymmetric interaction and novel contributions, in particular, that of spin–orbital coupling on the intermediate ligand ions. We have predicted a novel magnetic phenomenon, weak ferrimagnetism in mixed weak ferromagnets with competing signs of Dzyaloshinskii vectors. We revisit a problem of the DM coupling for a single bond in cuprates specifying the local spin–orbital contributions to the Dzyaloshinskii vector focusing on the oxygen term. We predict a novel puzzling effect of the on-site staggered spin polarization to be a result of the on-site spin–orbital coupling and the cation-ligand spin density transfer. The intermediate ligand nuclear magnetic resonance (NMR) measurements are shown to be an effective tool to inspect the effects of the DM coupling in an external magnetic field. We predict the effect of a strong oxygen-weak antiferromagnetism in edge-shared CuO 2 chains due to uncompensated oxygen Dzyaloshinskii vectors. We revisit the effects of symmetric spin anisotropy directly induced by the DM coupling. A critical analysis will be given of different approaches to exchange-relativistic coupling based on the cluster and the DFT (density functional theory) based calculations. Theoretical results are applied to different classes of 3d compounds from conventional weak ferromagnets ( α -Fe 2 O 3 , FeBO 3 , FeF 3 , RFeO 3 , RCrO 3 , ...) to unconventional systems such as weak ferrimagnets (e.g., RFe 1 - x Cr x O 3 ), helimagnets (e.g., CsCuCl 3 ), and parent cuprates (La 2 CuO 4 , ...).

27

Barman, Basabendu, Nicolás Bernal, Ashmita Das e Rishav Roshan. "Non-minimally coupled vector boson dark matter". Journal of Cosmology and Astroparticle Physics 2022, n. 01 (1 gennaio 2022): 047. http://dx.doi.org/10.1088/1475-7516/2022/01/047.

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Abstract We consider a simple abelian vector dark matter (DM) model, where only the DM (X̃μ) couples non-minimally to the scalar curvature (R̃) of the background spacetime via an operator of the form ∼X̃μ X̃μ R̃. By considering the standard freeze-out scenario, we show, it is possible to probe such a non-minimally coupled DM in direct detection experiments for a coupling strength ξ∼𝒪(1030) and DM mass m X ≲ 55 TeV, satisfying Planck observed relic abundance and perturbative unitarity. We also discuss DM production via freeze-in, governed by the non-minimal coupling, that requires ξ ≲10-5 to produce the observed DM abundance over a large range of DM mass depending on the choice of the reheating temperature. We further show, even in the absence of the non-minimal coupling, it is possible to produce the whole observed DM abundance via 2-to-2 scattering of the bath particles mediated by massless gravitons.

28

Lee, Su Houng, Chungsik Song e Hiroyuki Yabu. "Photon vector-meson coupling and vector meson properties in low temperature pion gas". Physics Letters B 341, n. 3-4 (gennaio 1995): 407–12. http://dx.doi.org/10.1016/0370-2693(95)80022-p.

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29

Liu, Xuanyu, e Kaiju Zhang. "Earth pressure prediction in sealed chamber of shield machine based on parallel least squares support vector machine optimized by cooperative particle swarm optimization". Measurement and Control 52, n. 7-8 (10 maggio 2019): 758–64. http://dx.doi.org/10.1177/0020294019840720.

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Earth pressure in sealed chamber is affected by multisystem and multifield coupling during shield tunneling process, so it is difficult to establish a mechanism earth pressure control model. Therefore, a data-driven modeling method of earth pressure in sealed chamber is proposed, which is based on parallel least squares support vector machine optimized by parallel cooperative particle swarm (parallel cooperative particle swarm optimization-partial least squares support vector machine). The vectors are parallel studied according to different hierarchies firstly, then the initial classifiers are updated by using cross-feedback method to retrain the vectors, and finally the vectors are merged to obtain the support vectors. The parameters of least squares support vector machine are optimized by the parallel cooperative particle swarm optimization, so as to predict quickly for large-scale data. Finally, the simulation experiment is carried out based on in-site measured data, and the results show that the method has high computing efficiency and prediction accuracy. The method has directive significance for engineering application.

30

KHOUDEIR, ADEL. "NON-ABELIAN ANTISYMMETRIC-VECTOR COUPLING FROM SELF-INTERACTION". Modern Physics Letters A 11, n. 31 (10 ottobre 1996): 2489–95. http://dx.doi.org/10.1142/s0217732396002484.

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31

Pöyhönen, Sanna, Antero Arkkio e Heikki Hyötyniemi. "Coupling Pairwise Support Vector Machines for Fault Classification". IFAC Proceedings Volumes 36, n. 5 (giugno 2003): 657–62. http://dx.doi.org/10.1016/s1474-6670(17)36567-9.

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32

Dominguez, C. A., C. van Gend e M. Loewe. "Thermal behavior of the axial vector coupling constant". Nuclear Physics B - Proceedings Supplements 86, n. 1-3 (giugno 2000): 413–16. http://dx.doi.org/10.1016/s0920-5632(00)00596-x.

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33

Bernard, Véronique, e Ulf-G. Meißner. "The nucleon axial-vector coupling beyond one loop". Physics Letters B 639, n. 3-4 (agosto 2006): 278–82. http://dx.doi.org/10.1016/j.physletb.2006.06.018.

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34

Henley, E. M., W.-Y. P. Hwang e L. S. Kisslinger. "Axial-vector coupling constants and chiral-symmetry restoration". Physical Review D 46, n. 1 (1 luglio 1992): 431–37. http://dx.doi.org/10.1103/physrevd.46.431.

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35

Pöyhönen, S., A. Arkkio, P. Jover e H. Hyötyniemi. "Coupling pairwise support vector machines for fault classification". Control Engineering Practice 13, n. 6 (giugno 2005): 759–69. http://dx.doi.org/10.1016/j.conengprac.2004.08.002.

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36

Wehner, R., B. Michel e P. Antonsen. "Visual navigation in insects: coupling of egocentric and geocentric information". Journal of Experimental Biology 199, n. 1 (1 gennaio 1996): 129–40. http://dx.doi.org/10.1242/jeb.199.1.129.

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Abstract (sommario):

Social hymenopterans such as bees and ants are central-place foragers; they regularly depart from and return to fixed positions in their environment. In returning to the starting point of their foraging excursion or to any other point, they could resort to two fundamentally different ways of navigation by using either egocentric or geocentric systems of reference. In the first case, they would rely on information continuously collected en route (path integration, dead reckoning), i.e. integrate all angles steered and all distances covered into a mean home vector. In the second case, they are expected, at least by some authors, to use a map-based system of navigation, i.e. to obtain positional information by virtue of the spatial position they occupy within a larger environmental framework. In bees and ants, path integration employing a skylight compass is the predominant mechanism of navigation, but geocentred landmark-based information is used as well. This information is obtained while the animal is dead-reckoning and, hence, added to the vector course. For example, the image of the horizon skyline surrounding the nest entrance is retinotopically stored while the animal approaches the goal along its vector course. As shown in desert ants (genus Cataglyphis), there is neither interocular nor intraocular transfer of landmark information. Furthermore, this retinotopically fixed, and hence egocentred, neural snapshot is linked to an external (geocentred) system of reference. In this way, geocentred information might more and more complement and potentially even supersede the egocentred information provided by the path-integration system. In competition experiments, however, Cataglyphis never frees itself of its homeward-bound vector - its safety-line, so to speak - by which it is always linked to home. Vector information can also be transferred to a longer-lasting (higher-order) memory. There is no need to invoke the concept of the mental analogue of a topographic map - a metric map - assembled by the insect navigator. The flexible use of vectors, snapshots and landmark-based routes suffices to interpret the insect's behaviour. The cognitive-map approach in particular, and the representational paradigm in general, are discussed.

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Huseynova, Narmin, e Shahin Mamedov. "a1-meson-baryon coupling constants in the framework of soft-wall and hard-wall AdS/QCD models". International Journal of Modern Physics A 34, n. 35 (20 dicembre 2019): 1950240. http://dx.doi.org/10.1142/s0217751x19502403.

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We calculate the [Formula: see text]-meson-nucleon ([Formula: see text]-baryon) coupling constant in the framework of soft-wall and hard-wall AdS/QCD models. Interaction Lagrangian in the bulk of AdS space was written for a minimal gauge coupling, a magnetic type coupling and a triple coupling of bulk fields. Applying AdS/CFT correspondence from the bulk interaction Lagrangian, we obtain holographic expressions for the [Formula: see text]-axial-vector meson-nucleon ([Formula: see text]-baryon) coupling constant in the boundary QCD theory. Numerical results for the [Formula: see text] coupling constant in the framework of both models are close to the known phenomenological estimates. The [Formula: see text]-axial-vector meson-[Formula: see text]-baryon coupling constant was considered in the framework of hard-wall model.

38

Jiang, Hao, Chong Yu, Shuwei Song, Wei Gao, Weifeng Sun e Hanquan Wang. "Characterized helical modulation of three-dimensional Skyrmions in the spin-orbit coupled condensate". International Journal of Modern Physics B 34, n. 19 (30 luglio 2020): 2050181. http://dx.doi.org/10.1142/s0217979220501817.

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For the Bose–Einstein condensate in the non-Abelian gauge field, the atomic wavefunction obtains helical modulation, which would lead to nontrivial objects, such as three-dimensional Skyrmion. The spin–orbit coupled condensate is usually capable of supporting Skyrmion ground states, which can be well understood through the wavefunction modulation vector concept. In the present manuscript, the modulation vector is characterized both analytically and numerically with respect to the spin–orbit coupling strength. For the SU(2) symmetric condensate, the modulation vector of the wavefunction is linearly proportional to the spin–orbit coupling strength. In the presence of spin-dependent interaction, the modulus of the modulation vector is predicted to increase or decrease according to the sign of the interaction parameter, resulting in a shrunken or expanded Skyrmion. However, the Skyrmion is unstable for a certain area of the parameter space of the spin–orbit coupling and spin-dependent interaction. The condensate favors a single Skyrmion state or the Skyrmion lattice state according to the strength of the spin–orbit coupling.

39

BUCHEL, A., F. A. CHISHTIE, M. T. HANIF, S. HOMAYOUNI, JUNJI JIA e D. G. C. McKEON. "RADIATIVE CORRECTIONS IN VECTOR-TENSOR MODELS". International Journal of Modern Physics A 25, n. 01 (10 gennaio 2010): 163–69. http://dx.doi.org/10.1142/s0217751x10047804.

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We consider a two-form antisymmetric tensor field ϕ minimally coupled to a non-Abelian vector field with a field strength F. Canonical analysis suggests that a pseudoscalar mass term [Formula: see text] for the tensor field eliminates degrees of freedom associated with this field. Explicit one-loop calculations show that an additional coupling m Tr (ϕ ∧ F) (which can be eliminated classically by a tensor field shift) reintroduces tensor field degrees of freedom. We attribute this to the lack of the renormalizability in our vector-tensor model. We also explore a vector-tensor model with a tensor field scalar mass term [Formula: see text] and coupling m Tr (ϕ ∧ ⋆F). We comment on the Stueckelberg mechanism for mass generation in the Abelian version of the latter model.

40

Gonçalves, Manuel A. F. V., Ietje van der Velde, Josephine M. Janssen, Bram T. H. Maassen, Evert H. Heemskerk, Dirk-Jan E. Opstelten, Shoshan Knaän-Shanzer, Dinko Valerio e Antoine A. F. de Vries. "Efficient Generation and Amplification of High-Capacity Adeno-Associated Virus/Adenovirus Hybrid Vectors". Journal of Virology 76, n. 21 (1 novembre 2002): 10734–44. http://dx.doi.org/10.1128/jvi.76.21.10734-10744.2002.

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ABSTRACT Effective gene therapy is dependent on safe gene delivery vehicles that can achieve efficient transduction and sustained transgene expression. We are developing a hybrid viral vector system that combines in a single particle the large cloning capacity and efficient cell cycle-independent nuclear gene delivery of adenovirus (Ad) vectors with the long-term transgene expression and lack of viral genes of adeno-associated virus (AAV) vectors. The strategy being pursued relies on coupling the AAV DNA replication mechanism to the Ad encapsidation process through packaging of AAV-dependent replicative intermediates provided with Ad packaging elements into Ad capsids. The generation of these high-capacity AAV/Ad hybrid vectors takes place in Ad early region 1 (E1)-expressing cells and requires an Ad vector with E1 deleted to complement in trans both AAV helper functions and Ad structural proteins. The dependence on a replicating helper Ad vector leads to the contamination of AAV/Ad hybrid vector preparations with a large excess of helper Ad particles. This renders the further propagation and ultimate use of these gene delivery vehicles very difficult. Here, we show that Cre/loxP-mediated genetic selection against the packaging of helper Ad DNA can reduce helper Ad vector contamination by 99.98% without compromising hybrid vector rescue. This allowed amplification of high-capacity AAV/Ad hybrid vectors to high titers in a single round of propagation.

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Besprosvany, J. "Standard-Model Coupling Constants from Compositeness". Modern Physics Letters A 18, n. 27 (7 settembre 2003): 1877–85. http://dx.doi.org/10.1142/s0217732303011642.

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A coupling-constant definition is given based on the compositeness property of some particle states with respect to the elementary states of other particles. It is applied in the context of the vector-spin-1/2-particle interaction vertices of a field theory, and the standard model. The definition reproduces Weinberg's angle in a grand-unified theory. One obtains coupling values close to the experimental ones for appropriate configurations of the standard-model vector particles, at the unification scale within grand-unified models, and at the electroweak breaking scale.

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FERREIRA, MANOEL M., e FERNANDO M. O. MOUCHEREK. "INFLUENCE OF LORENTZ- AND CPT-VIOLATING TERMS ON THE DIRAC EQUATION". International Journal of Modern Physics A 21, n. 30 (10 dicembre 2006): 6211–27. http://dx.doi.org/10.1142/s0217751x06033842.

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The influence of Lorentz- and CPT-violating terms (in "vector" and "axial vector" couplings) on the Dirac equation is explicitly analyzed: plane-wave solutions, dispersion relations and eigenenergies are explicitly obtained. The nonrelativistic limit is worked out and the Lorentz-violating Hamiltonian identified in both cases, in full agreement with the results already established in the literature. Finally, the physical implications of this Hamiltonian on the spectrum of hydrogen are evaluated both in the absence and presence of a magnetic external field. It is observed that the fixed background, when considered in a vector coupling, yields no qualitative modification in the hydrogen spectrum, whereas it does provide an effective Zeeman-like splitting of the spectral lines whenever coupled in the axial vector form. It is also argued that the presence of an external fixed field does not imply new modifications on the spectrum.

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Hoang, Manh Tuong. "EFFECT OF CROSS-COUPLING ON STABILITY MARGIN OF GYROVERTICAL PLATFORM AND DECOUPLING METHOD". Journal of Science and Technique 14, n. 4 (28 agosto 2019): 57–65. http://dx.doi.org/10.56651/lqdtu.jst.v14.n04.424.

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The paper investigates the effect of cross-couplings in gyrovertical platform and proposes a method to decouple. The gyroplatform uses two gyroscopes whose axial precession is perpendicular to the respective axis of platform and has an angular momentum vector in opposite directions. This layout will reduce the influence of the rotation of gyro motors. However, between the gyroplatform channels there appears cross-coupling that reduces the stability of system stabilization. The simulation results show effect of cross-couplings on the stability and method to overcome these problems.

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Davis, Timothy J., David Janoschka, Pascal Dreher, Bettina Frank, Frank-J. Meyer zu Heringdorf e Harald Giessen. "Ultrafast vector imaging of plasmonic skyrmion dynamics with deep subwavelength resolution". Science 368, n. 6489 (23 aprile 2020): eaba6415. http://dx.doi.org/10.1126/science.aba6415.

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Plasmonic skyrmions are an optical manifestation of topological defects in a continuous vector field. Identifying them requires characterization of the vector structure of the electromagnetic near field on thin metal films. Here we introduce time-resolved vector microscopy that creates movies of the electric field vectors of surface plasmons with subfemtosecond time steps and a 10-nanometer spatial scale. We image complete time sequences of propagating surface plasmons as well as plasmonic skyrmions, resolving all vector components of the electric field and their time dynamics, thus demonstrating dynamic spin-momentum coupling as well as the time-varying skyrmion number. The ability to image linear optical effects in the spin and phase structures of light in the single-nanometer range will allow for entirely novel microscopy and metrology applications.

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Luo, Yumei, e Detu Zhu. "Combinatorial Control of Transgene Expression by Hypoxia-Responsive Promoter and MicroRNA Regulation for Neural Stem Cell-Based Cancer Therapy". BioMed Research International 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/751397.

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Owing to their strong migratory capacity, tumor tropism, and tumor inhibitory effect, neural stem cells (NSCs) have recently emerged as one of the most attractive gene delivery vectors for cancer therapy. However, further animal studies found that proportional NSC vectors were distributed to nontarget organs after intravenous injection and the nonspecific transgene expression led to significant cytotoxic effects in these organs. Hence, an expression cassette that controls the transgene expression within NSC vectors in a tumor site-specific manner is desired. Considering hypoxia as a hallmark of tumor microenvironment, we have developed a novel NSC vector platform coupling transcriptional targeting with microRNA (miRNA) regulation for tumor hypoxia targeting. This combinatorial vector employed a hypoxia-responsive promoter and repeated targeting sequences of an miRNA that is enriched in NSCs but downregulated upon hypoxia induction to control the transgene expression. This resulted in significantly improved hypoxic selectivity over the use of a control vector without miRNA regulation. Thus, incorporating miRNA regulation into a transcriptional targeting vector adds an extra layer of security to prevent off-target transgene expression and should be useful for the development of NSC vectors with high targeting specifcity for cancer therapy.

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Kiselev, Alexei D., Ranim Ali e Andrei V. Rybin. "Lindblad Dynamics and Disentanglement in Multi-Mode Bosonic Systems". Entropy 23, n. 11 (27 ottobre 2021): 1409. http://dx.doi.org/10.3390/e23111409.

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In this paper, we consider the thermal bath Lindblad master equation to describe the quantum nonunitary dynamics of quantum states in a multi-mode bosonic system. For the two-mode bosonic system interacting with an environment, we analyse how both the coupling between the modes and the coupling with the environment characterised by the frequency and the relaxation rate vectors affect dynamics of the entanglement. We discuss how the revivals of entanglement can be induced by the dynamic coupling between the different modes. For the system, initially prepared in a two-mode squeezed state, we find the logarithmic negativity as defined by the magnitude and orientation of the frequency and the relaxation rate vectors. We show that, in the regime of finite-time disentanglement, reorientation of the relaxation rate vector may significantly increase the time of disentanglement.

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Famoriji, Oluwole John, e Thokozani Shongwe. "Subspace Pseudointensity Vectors Approach for DoA Estimation Using Spherical Antenna Array in the Presence of Unknown Mutual Coupling". Applied Sciences 12, n. 19 (8 ottobre 2022): 10099. http://dx.doi.org/10.3390/app121910099.

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Spherical antenna array (SAA) exhibits the ability to receive electromagnetic (EM) waves with the same signal strength, regardless of the direction-of-arrival (DoA), angle-of-arrival, and polarization. Hence, estimating the DoA of EM signals that impinge on SAA in the presence of mutual coupling requires research consideration. In this paper, a subspace pseudointensity vectors technique is proposed for DoA estimation using SAA with unknown mutual coupling. DoA estimation using an intensity vector technique is appealing due to its computational efficiency, particularly for SAAs. Two intensity vector-based techniques that operate with spherical harmonic decomposition (SHD) of an EM wave obtained from SAA are presented. The first technique employed pseudointensity vectors (PV) and operates quite well under EM conditions when one source is in operation each time, while the second technique employed subspace pseudointensity vectors (SPV) and operates under EM conditions when multi-sources and multiple reflection cause more challenging problems. The degree of correctness in the estimation of the DoA via the PVs and SPVs is measured using baseline methods in the literature via simulations, adding noise to stationary, single-source and multi-source methods. In addition, incorporating mutual coupling effects, data from experiments, which are the generally acceptable ground truth when examining any procedure, are further used to illustrate the robustness and efficiency of the proposed techniques. The results are sufficiently inspiring for the practical deployment of the proposed techniques.

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Chen , Peng, Zhimin Chen, Xuan Zhang e Linxi Liu. "SBL-Based Direction Finding Method with Imperfect Array". Electronics 7, n. 12 (11 dicembre 2018): 426. http://dx.doi.org/10.3390/electronics7120426.

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The imperfect array degrades the direction finding performance. In this paper, we investigate the direction finding problem in uniform linear array (ULA) system with unknown mutual coupling effect between antennas. By exploiting the target sparsity in the spatial domain, the sparse Bayesian learning (SBL)-based model is proposed and converts the direction finding problem into a sparse reconstruction problem. In the sparse-based model, the off-grid errors are introduced by discretizing the direction area into grids. Therefore, an off-grid SBL model with mutual coupling vector is proposed to overcome both the mutual coupling and the off-grid effect. With the distribution assumptions of unknown parameters including the noise variance, the off-grid vector, the received signals and the mutual coupling vector, a novel direction finding method based on SBL with unknown mutual coupling effect named DFSMC is proposed, where an expectation-maximum (EM)-based step is adopted by deriving the estimation expressions for all the unknown parameters theoretically. Simulation results show that the proposed DFSMC method can outperform state-of-the-art direction finding methods significantly in the array system with unknown mutual coupling effect.

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Pan, Zhong Liang, e Ling Chen. "Test Generation for Glitch Faults of Crosstalk Effects in Digital Circuits Based on Genetic Algorithm with Niche". Applied Mechanics and Materials 20-23 (gennaio 2010): 647–52. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.647.

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The more signal path ways close to each other in digital circuits, the greater the coupling effects. The coupling effects can led to an increasing number of signal integrity related faults such as crosstalk faults. In this paper, the glitch faults of crosstalk effects are studied. First of all, the test vector generation using signal paths of circuits is given. Secondly, a new test method for crosstalk faults in digital circuits is presented, which is based on the genetic algorithm with niche. The test method can detect the maximal crosstalk effects, i.e. the test vectors to be produced is to switch a set of aggressors that maximizes the switching of total coupling effects. The test method is also used to produce the test vectors of multiple crosstalk faults. The experimental results show that the method proposed in this paper can get the test vectors of the multiple crosstalk faults if the faults are testable.

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JAIN, PANKAJ, ARSHAD MOMEN e JOSEPH SCHECHTER. "HEAVY MESON RADIATIVE DECAYS AND LIGHT VECTOR MESON DOMINANCE". International Journal of Modern Physics A 10, n. 17 (10 luglio 1995): 2467–78. http://dx.doi.org/10.1142/s0217751x95001182.

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Electromagnetic interactions are introduced in the effective chiral Lagrangian for heavy mesons which includes light vector particles. A suitable notion of vector meson dominance is formulated. The constraints on the heavy meson-light vector and heavy meson-light pseudoscalar coupling constants are obtained using experimental D*→Dγ branching ratios. These constraints are compared with values estimated from semileptonic transition amplitudes as well as from extension of the light meson coupling pattern. Application to the heavy baryon spectrum in the “bound state” model is made.