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Artículos de revistas sobre el tema "String models"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de agosto de 2024

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1

Gustafson, Gösta. "String models". Nuclear Physics A 566 (enero de 1994): 233–44. http://dx.doi.org/10.1016/0375-9474(94)90629-7.

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2

Boulware, David G. y S. Deser. "String-Generated Gravity Models". Physical Review Letters 55, n.º 24 (9 de diciembre de 1985): 2656–60. http://dx.doi.org/10.1103/physrevlett.55.2656.

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3

Lawrence, Albion y John McGreevy. "D-terms and D-strings in open string models". Journal of High Energy Physics 2004, n.º 10 (23 de octubre de 2004): 056. http://dx.doi.org/10.1088/1126-6708/2004/10/056.

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4

RANDJBAR-DAEMI, S., ABDUS SALAM y J. A. STRATHDEE. "σ-MODELS AND STRING THEORIES". International Journal of Modern Physics A 02, n.º 03 (junio de 1987): 667–93. http://dx.doi.org/10.1142/s0217751x87000247.

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The propagation of closed bosonic strings interacting with background gravitational and dilaton fields is reviewed. The string is treated as a quantum field theory on a compact 2-dimensional manifold. The question is posed as to how the conditions for the vanishing trace anomaly and the ensuing background field equations may depend on global features of the manifold. It is shown that to the leading order in σ-model perturbation theory the string loop effects do not modify the gravitational and the dilaton field equations. However for the purely bosonic strings new terms involving the modular parameter of the world sheet are induced by quantum effects which can be absorbed into a re-definition of the background fields. We also discuss some aspects of several regularization schemes such as dimensional, Pauli-Villars and the proper-time cut off in an appendix.

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5

Faraggi, A. E., E. Manno y C. Timirgaziu. "Minimal standard heterotic string models". European Physical Journal C 50, n.º 3 (6 de marzo de 2007): 701–10. http://dx.doi.org/10.1140/epjc/s10052-007-0243-5.

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6

Nepomechie, Rafael I. "String models with twisted currents". Physical Review D 34, n.º 4 (15 de agosto de 1986): 1129–35. http://dx.doi.org/10.1103/physrevd.34.1129.

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7

Bergman, Oren y Charles B. Thorn. "String bit models for superstring". Physical Review D 52, n.º 10 (15 de noviembre de 1995): 5980–96. http://dx.doi.org/10.1103/physrevd.52.5980.

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8

Danilov, G. S. y L. N. Lipatov. "BFKL pomeron in string models". Nuclear Physics B 754, n.º 1-2 (octubre de 2006): 187–232. http://dx.doi.org/10.1016/j.nuclphysb.2006.07.017.

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9

Moss de Oliveira, S., P. M. C. de Oliveira y D. Stauffer. "Bit-string models for parasex". Physica A: Statistical Mechanics and its Applications 322 (mayo de 2003): 521–30. http://dx.doi.org/10.1016/s0378-4371(02)01916-7.

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10

Constantin, Andrei, Yang-Hui He y Andre Lukas. "Counting string theory standard models". Physics Letters B 792 (mayo de 2019): 258–62. http://dx.doi.org/10.1016/j.physletb.2019.03.048.

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11

Yang, Z. "Compactified D=1 string models". Physics Letters B 243, n.º 4 (julio de 1990): 365–72. http://dx.doi.org/10.1016/0370-2693(90)91398-u.

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12

Lorenz-Petzold, D. "String-driven anisotropic cosmological models". Astrophysics and Space Science 155, n.º 2 (1989): 335–39. http://dx.doi.org/10.1007/bf00643871.

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13

Curtright, T. L., G. I. Ghandour y C. B. Thorn. "Spin content of string models". Physics Letters B 182, n.º 1 (diciembre de 1986): 45–52. http://dx.doi.org/10.1016/0370-2693(86)91076-2.

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14

Lorenz-Petzold, D. "String-generated anisotropic cosmological models". Physics Letters B 197, n.º 1-2 (octubre de 1987): 71–75. http://dx.doi.org/10.1016/0370-2693(87)90344-3.

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15

Bailin, David y Alex Love. "String unification in orbifold models". Physics Letters B 278, n.º 1-2 (marzo de 1992): 125–30. http://dx.doi.org/10.1016/0370-2693(92)90722-g.

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16

Bilbao, Stefan y Michele Ducceschi. "Models of musical string vibration". Acoustical Science and Technology 44, n.º 3 (1 de mayo de 2023): 194–209. http://dx.doi.org/10.1250/ast.44.194.

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17

Xia, Hui, Yi Hua Dou, Xin He Wang y Jiang Wen Xu. "Sectionalized Mechanical Models of Drilling Tool of Trenchless Directional Drilling". Applied Mechanics and Materials 268-270 (diciembre de 2012): 1190–93. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1190.

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There are three working conditions namely drilling a guide hole, expanding the guide hole and pulling back pipeline in trenchless directional drilling. The position of drill string in the wellbore and loads exerted on the drill string varied in different working conditions. The models of buckling analysis of drill strings under compression, mechanical analysis of drill string under axial compression near drill bit in inclined straight section, mechanical analysis of drill string with multi-centralizers under axial compression near drill bit in inclined straight section, mechanical analysis of drill string near drill bit under axial compression in horizontal section, mechanical analysis of drill string near drill bit under axial tension in horizontal section, mechanical analysis of drill strings near drill bit under axial tension in inclined straight section and mechanical analysis of drill string in failed well are established based on the characteristic of loads and trajectories in each section. The establishment of sectionalized mechanical model of drilling tool is the fundament of further study of force analysis, deformation analysis and stress analysis.

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18

Aoyama, S., P. Pasti y M. Tonin. "The GS and NRS heterotic strings from twistor-string models". Physics Letters B 283, n.º 3-4 (junio de 1992): 213–17. http://dx.doi.org/10.1016/0370-2693(92)90010-2.

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19

Kerkhof, Jeroen y Antoon Pelsser. "Observational Equivalence of Discrete String Models and Market Models". Journal of Derivatives 10, n.º 1 (31 de agosto de 2002): 55–61. http://dx.doi.org/10.3905/jod.2002.319190.

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20

FILIPPOV, A. T. y A. P. ISAEV. "GAUGE MODELS OF “DISCRETE STRINGS”". Modern Physics Letters A 04, n.º 22 (30 de octubre de 1989): 2167–76. http://dx.doi.org/10.1142/s0217732389002434.

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A new class of constrained hamiltonian systems with a finite number of degrees of freedom is proposed in which excitations can be divided into two groups analogous to the left and right movers of string theories. Some of these models can be regarded as discrete analogs of the bosonic string, and in the continuum limit with the infinite dimensional constraint algebra Vect (S1)⊗ Vect (S1) one can obtain the classical theory of closed bosonic strings. We also discuss the problem of quantizing these models and constructing the propagator by using path integral methods. A possibility of a supersymmetric extension of our models is also pointed out.

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21

Catenacci, Roberto y Pietro Grassi. "String Sigma Models on Curved Supermanifolds". Universe 4, n.º 4 (24 de abril de 2018): 60. http://dx.doi.org/10.3390/universe4040060.

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22

Hernández, Francisco J., Francisco Nettel y Hernando Quevedo. "Gravitational fields as generalized string models". Gravitation and Cosmology 15, n.º 2 (abril de 2009): 109–20. http://dx.doi.org/10.1134/s0202289309020029.

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23

Singh, G. P. y T. Singh. "String Cosmological Models with Magnetic Field". General Relativity and Gravitation 31, n.º 3 (marzo de 1999): 371–78. http://dx.doi.org/10.1023/a:1026644828215.

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24

Shabelski, Y. M. y M. G. Ryskin. "Tetraquarks and pentaquarks in string models". European Physical Journal C 50, n.º 1 (3 de febrero de 2007): 81–83. http://dx.doi.org/10.1140/epjc/s10052-006-0207-1.

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25

Craps, Ben. "Big bang models in string theory". Classical and Quantum Gravity 23, n.º 21 (4 de octubre de 2006): S849—S881. http://dx.doi.org/10.1088/0264-9381/23/21/s01.

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26

Berera, Arjun y Thomas W. Kephart. "Ubiquitous Inflaton in String-Inspired Models". Physical Review Letters 83, n.º 6 (9 de agosto de 1999): 1084–87. http://dx.doi.org/10.1103/physrevlett.83.1084.

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27

Kawai, H., D. C. Lewellen y S. H. H. Tye. "Classification of closed-fermionic-string models". Physical Review D 34, n.º 12 (15 de diciembre de 1986): 3794–804. http://dx.doi.org/10.1103/physrevd.34.3794.

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28

Anagnostopoulos, Konstantinos N., Jun Nishimura y Poul Olesen. "Noncommutative String Worldsheets from Matrix Models". Journal of High Energy Physics 2001, n.º 04 (20 de abril de 2001): 024. http://dx.doi.org/10.1088/1126-6708/2001/04/024.

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29

Momen, Arshad y Carl Rosenzweig. "Deconfinement transition and flux-string models". Physical Review D 56, n.º 3 (1 de agosto de 1997): 1437–44. http://dx.doi.org/10.1103/physrevd.56.1437.

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30

CVETIČ, MIRJAM y PAUL LANGACKER. "NEW GAUGE BOSONS FROM STRING MODELS". Modern Physics Letters A 11, n.º 15 (20 de mayo de 1996): 1247–62. http://dx.doi.org/10.1142/s0217732396001260.

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We address the mass ranges of new neutral gauge bosons and constraints on the accompanying exotic particles as predicted by a class of superstring models. Under certain assumptions about the supersymmetry breaking parameters we show that breaking of an additional U(1)′ symmetry is radiative when the appropriate Yukawa couplings of exotic particles are of order one, analogous to the radiative breaking of the electroweak symmetry in the supersymmetric standard model due to the large top-quark Yukawa coupling. Such large Yukawa couplings occur for a large class of string models. The Z′ and exotic masses are either of [Formula: see text], or of a scale intermediate between the string and electroweak scales. In the former case, [Formula: see text] may be achieved without excessive fine-tuning, and is within future experimental reach.

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31

Carter, Brandon y Patrick Peter. "Supersonic string models for Witten vortices". Physical Review D 52, n.º 4 (15 de agosto de 1995): R1744—R1748. http://dx.doi.org/10.1103/physrevd.52.r1744.

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32

Sagnotti, Augusto. "Open-string models with broken supersymmetry". Nuclear Physics B - Proceedings Supplements 88, n.º 1-3 (junio de 2000): 160–67. http://dx.doi.org/10.1016/s0920-5632(00)00764-7.

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33

Bueno-Guerrero, Alberto, Manuel Moreno y Javier F. Navas. "Stochastic string models with continuous semimartingales". Physica A: Statistical Mechanics and its Applications 433 (septiembre de 2015): 229–46. http://dx.doi.org/10.1016/j.physa.2015.03.070.

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34

Adhav, K. S., M. V. Dawande y V. B. Raut. "Bianchi Type-III String Cosmological Models". International Journal of Theoretical Physics 48, n.º 3 (16 de septiembre de 2008): 700–705. http://dx.doi.org/10.1007/s10773-008-9846-3.

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35

Singh, J. K. "String Cosmological Models in Lyra Geometry". International Journal of Theoretical Physics 48, n.º 3 (9 de octubre de 2008): 905–12. http://dx.doi.org/10.1007/s10773-008-9863-2.

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36

Ram, Shri y J. K. Singh. "Some spatially homogeneous string cosmological models". General Relativity and Gravitation 27, n.º 11 (noviembre de 1995): 1207–13. http://dx.doi.org/10.1007/bf02108233.

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37

Hořava, Petr. "Background duality of open-string models". Physics Letters B 231, n.º 3 (noviembre de 1989): 251–57. http://dx.doi.org/10.1016/0370-2693(89)90209-8.

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38

Nahm, W. "A classification of open string models". Communications in Mathematical Physics 105, n.º 1 (marzo de 1986): 1–11. http://dx.doi.org/10.1007/bf01212338.

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39

Brustein, Ram y Merav Hadad. "Particle production in string cosmology models". Physical Review D 57, n.º 2 (15 de enero de 1998): 725–40. http://dx.doi.org/10.1103/physrevd.57.725.

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40

Quevedo, Fernando. "Local string models and moduli stabilisation". Modern Physics Letters A 30, n.º 07 (26 de febrero de 2015): 1530004. http://dx.doi.org/10.1142/s0217732315300049.

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A brief overview is presented of the progress made during the past few years on the general structure of local models of particle physics from string theory including: moduli stabilisation, supersymmetry breaking, global embedding in compact Calabi–Yau compactifications and potential cosmological implications. Type IIB D-brane constructions and the Large Volume Scenario (LVS) are discussed in some detail emphasising the recent achievements and the main open questions.

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41

VAFA, CUMRUN. "STRING VACUA AND ORBIFOLDIZED LG MODELS". Modern Physics Letters A 04, n.º 12 (20 de junio de 1989): 1169–85. http://dx.doi.org/10.1142/s0217732389001350.

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We investigate how string vacua arise from N=2 superconformal models. In particular, we discuss how Landau-Ginzburg models with appropriate central charge can be orbifol-dized to construct string vacua. We develop techniques to compute the degeneracy and quantum numbers of the ground states of the LG models in the twisted sectors, even for the cases where the underlying LG model is not exactly solvable. This allows us to compute some interesting physical quantities such as the number of generations and anti-generations in the simplest compactification scenarios. The results agree with explicit computations in the cases where LG model is exactly solvable.

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42

DUNBAR, DAVID C. "FERMIONIC STRING MODELS AND ZN ORBIFOLDS". Modern Physics Letters A 04, n.º 24 (20 de noviembre de 1989): 2339–47. http://dx.doi.org/10.1142/s021773238900263x.

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43

DEMETERFI, KREŠIMIR y CHUNG-I. TAN. "STRING EQUATIONS FROM UNITARY MATRIX MODELS". Modern Physics Letters A 05, n.º 20 (20 de agosto de 1990): 1563–74. http://dx.doi.org/10.1142/s0217732390001785.

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We investigate unitary matrix models in the scaling limit using the method of orthogonal polynomials on the unit circle. We show that, f or a certain choice of coupling constants, string equations belong to the same univesality class as equations obtained from Hermitian matrix models. In addition, we show how a new class of string equations emerges as a consequence of the compactness of the unitary groups.

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44

Sénéchal, David. "Search for four-dimensional string models". Physical Review D 39, n.º 12 (15 de junio de 1989): 3717–30. http://dx.doi.org/10.1103/physrevd.39.3717.

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45

Dine, Michael y Nathan Seiberg. "Are (0, 2) models string miracles?" Nuclear Physics B 306, n.º 1 (agosto de 1988): 137–59. http://dx.doi.org/10.1016/0550-3213(88)90174-5.

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46

Faraggi, A. E. "MSHSM - Minimal Standard Heterotic String Models". Fortschritte der Physik 58, n.º 7-9 (19 de febrero de 2010): 733–37. http://dx.doi.org/10.1002/prop.201000012.

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47

Bars, Itzhak. "Heterotic string models in curved spacetime". Physics Letters B 293, n.º 3-4 (octubre de 1992): 315–20. http://dx.doi.org/10.1016/0370-2693(92)90889-c.

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48

Andreev, Oleg. "String breaking in a cold wind as seen by string models". Nuclear Physics B 977 (abril de 2022): 115724. http://dx.doi.org/10.1016/j.nuclphysb.2022.115724.

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49

Bonelli, Giulio. "Matrix string models for exact (2,2) string theories in RR backgrounds". Nuclear Physics B 649, n.º 1-2 (enero de 2003): 130–42. http://dx.doi.org/10.1016/s0550-3213(02)01036-2.

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50

Hong, Soon-Tae. "Phenomenologies in Hypersphere Soliton and Stringy Photon Models". Universe 9, n.º 9 (23 de agosto de 2023): 378. http://dx.doi.org/10.3390/universe9090378.

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We consider the Dirac quantization in the first-class formalism to investigate the hypersphere soliton model (HSM) defined on the S3 hypersphere. To do this, we construct the first-class Hamiltonian possessing the Weyl ordering correction. In the HSM, we evaluate the baryon physical quantities such as the baryon masses, magnetic moments, axial coupling constant and charge radii, most predicted values of which are in good agreement with the corresponding experimental data. Moreover, shuffling the baryon and transition magnetic moments, we find the model independent sum rules. In the HSM we also evaluate the baryon intrinsic frequencies such as ωN=0.87×1023s−1 and ωΔ=1.74×1023s−1 of the nucleon and delta baryon, respectively, to yield the identity ωΔ=2ωN. Next, making use of the Nambu-Goto string action and its extended rotating bosonic string theory, we formulate the stringy photon model to obtain the energy of the string configuration, which consists of the rotational and vibrational energies of the open string. Exploiting this total string energy, we evaluate the photon intrinsic frequency ωγ=9.00×1023s−1, which is comparable to the corresponding baryon intrinsic frequencies. We also predict the photon size ⟨r2⟩1/2(photon)=0.17fm, which is approximately 21% of the proton magnetic charge radius.

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