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Littérature scientifique sur le sujet « Extended theories of gravity »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 14 mars 2023

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Articles de revues sur le sujet "Extended theories of gravity"

Capozziello, Salvatore, et Mariafelicia De Laurentis. « Extended Theories of Gravity ». Physics Reports 509, n^o 4-5 (décembre 2011) : 167–321. http://dx.doi.org/10.1016/j.physrep.2011.09.003.

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Fatibene, Lorenzo, et Simon Garruto. « Extended gravity ». International Journal of Geometric Methods in Modern Physics 11, n^o 07 (août 2014) : 1460018. http://dx.doi.org/10.1142/s0219887814600184.

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We shall show equivalence between Palatini-f(ℛ) theories and Brans–Dicke (BD) theories at the level of action principles in generic dimension with generic matter coupling. We do that by introducing the Helmholtz Lagrangian associated to Palatini-f(ℛ) theory and then performing frame transformations in order to recover Einstein frame and BD frame. This clarifies the relation among different formulations and the transformations among different frames. Additionally, it defines a formulation a lá Palatini for the BD theory which is dynamically equivalent to metric BD (unlike the standard Palatini-formulation of metric BD theory which are not dynamically equivalent). In conclusion, we discuss interpretation of extended theories of gravitation and perspectives.

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Komada, Meguru. « Causality of 3D extended gravity theories ». Modern Physics Letters A 34, n^o 16 (29 mai 2019) : 1950122. http://dx.doi.org/10.1142/s0217732319501220.

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Causality is one of the most important properties to understand gravity theories. It gives us not only a method to confirm that the gravity theories are really consistent, but also gives implications about the properties which unknown fundamental physics should obey. We investigate the causality of three-dimensional (3D) gravity theories, which are considered to be important, by using the Shapiro time delay effect in the Shock wave geometry. One of such gravity theories is the Zwei-Dreibein Gravity (ZDG) theory, which is a consistent 3D gravity theory. In ZDG theory, the serious problems can be removed that have appeared in another important gravity theory called New Massive Gravity (NMG). We study whether the ZDG theory could preserve the causality without losing the above good properties and how the causality structure is related to the structure of the NMG theory.

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Crisostomi, Marco, Kazuya Koyama et Gianmassimo Tasinato. « Extended scalar-tensor theories of gravity ». Journal of Cosmology and Astroparticle Physics 2016, n^o 04 (21 avril 2016) : 044. http://dx.doi.org/10.1088/1475-7516/2016/04/044.

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Sherf, Yotam. « Hyperbolicity constraints in extended gravity theories ». Physica Scripta 94, n^o 8 (4 juin 2019) : 085005. http://dx.doi.org/10.1088/1402-4896/ab1352.

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de Mello, R. O. « Extended 2D generalized dilaton gravity theories ». Classical and Quantum Gravity 25, n^o 17 (13 août 2008) : 175003. http://dx.doi.org/10.1088/0264-9381/25/17/175003.

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Aschieri, Paolo, et Leonardo Castellani. « Extended gravity theories from dynamical noncommutativity ». General Relativity and Gravitation 45, n^o 2 (9 novembre 2012) : 411–26. http://dx.doi.org/10.1007/s10714-012-1479-4.

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Capozziello, Salvatore, Rocco D’Agostino et Orlando Luongo. « Extended gravity cosmography ». International Journal of Modern Physics D 28, n^o 10 (juillet 2019) : 1930016. http://dx.doi.org/10.1142/s0218271819300167.

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Cosmography can be considered as a sort of a model-independent approach to tackle the dark energy/modified gravity problem. In this review, the success and the shortcomings of the [Formula: see text]CDM model, based on General Relativity (GR) and standard model of particles, are discussed in view of the most recent observational constraints. The motivations for considering extensions and modifications of GR are taken into account, with particular attention to [Formula: see text] and [Formula: see text] theories of gravity where dynamics is represented by curvature or torsion field, respectively. The features of [Formula: see text] models are explored in metric and Palatini formalisms. We discuss the connection between [Formula: see text] gravity and scalar–tensor theories highlighting the role of conformal transformations in the Einstein and Jordan frames. Cosmological dynamics of [Formula: see text] models is investigated through the corresponding viability criteria. Afterwards, the equivalent formulation of GR (Teleparallel Equivalent General Relativity (TEGR)) in terms of torsion and its extension to [Formula: see text] gravity is considered. Finally, the cosmographic method is adopted to break the degeneracy among dark energy models. A novel approach, built upon rational Padé and Chebyshev polynomials, is proposed to overcome limits of standard cosmography based on Taylor expansion. The approach provides accurate model-independent approximations of the Hubble flow. Numerical analyses, based on Monte Carlo Markov Chain integration of cosmic data, are presented to bound coefficients of the cosmographic series. These techniques are thus applied to reconstruct [Formula: see text] and [Formula: see text] functions and to frame the late-time expansion history of the universe with no a priori assumptions on its equation-of-state. A comparison between the [Formula: see text]CDM cosmological model with [Formula: see text] and [Formula: see text] models is reported.

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Vinckers, U. K. Beckering, Á. de la Cruz-Dombriz et F. J. Maldonado Torralba. « Focusing conditions for extended teleparallel gravity theories ». Journal of Cosmology and Astroparticle Physics 2020, n^o 12 (9 décembre 2020) : 020. http://dx.doi.org/10.1088/1475-7516/2020/12/020.

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Adami, Hamed, Mohammad Reza Setare, Tahsin Çağrı Şişman et Bayram Tekin. « Conserved charges in extended theories of gravity ». Physics Reports 834-835 (novembre 2019) : 1–85. http://dx.doi.org/10.1016/j.physrep.2019.08.003.

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Thèses sur le sujet "Extended theories of gravity"

von, Braun-Bates F. « Non-linear gravitational collapse in extended gravity theories ». Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:910fd25d-38e0-4bd4-84cf-bf5c196c8f99.

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General Relativity (GR) is one theory amongst a wider range of plausible descriptions of the Universe. The aim of this thesis is to examine the behaviour of so-called screened theories, which are designed to avoid local tests of modified gravity (MG). We establish that these theories may be treated in a unified manner in the context of halo formation. A prerequisite for this is the clarification that the quasi-static approximation can be applied in cosmologically-plausible scenarios. Amongst the plethora of MG theories, we select three, each of which exhibit a different form of screening. This describes a self-concealing property whereby each theory behaves like GR in the conditions of the local Universe. Only at regions of high energy density (chameleon), large coupling to matter (symmetron) or large derivatives of the scalar field (Vainshtein) does their modified behaviour emerge. We examine f(R), symmetron and DGP gravity in the context of non-linear gravitational collapse for the remainder of the thesis. Relativistic scalar fields are ubiquitous in our modern understanding of structure formation. They arise as candidates for dark energy and are at the heart of many modified theories of gravity. While there has been tremendous progress in calculating their effects on large scales there are still open questions on how to best quantify their effects on smaller scales where non-linear collapse becomes important. In these regimes, it has become the norm to use the quasi-static approximation in which the time evolution of perturbations in the scalar fields are discarded, akin to what is done in the context of non-relativistic fields in cosmology and the corresponding Newtonian limit. We show that considerable care must be taken in this regime by studying linearly perturbed scalar field cosmologies and quantifying the error that arise from taking the quasi-static limit. We focus on f(R) and chameleon models to assess the impact of the quasi-static approximation and discuss how it might affect studying the non-linear growth of structure in N-body numerical simulations. The halo mass function (HMF) n(M) dM is the number of haloes with mass in the range [ M, M+dM ] per unit volume. It has two remarkable properties which render it a useful probe of extensions to general relativity (GR). On the one hand, it is (nearly-)universal, in the sense that it can be written in a form (f(v) which is (practically) insensitive to changes in redshift and cosmological parameters and redshift. We develop a method to generalise fitting functions derived in GR to a variety of screened MG theories, in order to examine whether they are universal in the sense of being insensitive to MG. On the other hand, the HMF is sensitive to both the expansion history of the universe and the non-linear behaviour of spherical collapse via the critical density parameter and the matter power spectrum via the halo resolution. This greatly complicates the theoretical framework required to calculate the HMF, particularly given the sensitivity of chameleon MG to the surrounding environment. We explore a variety of new and existing methods to do so. Finally we re-calibrate the MG halo mass functions with the same rigour as has been done in GR. An important indicator of modified gravity is the effect of the local environment on halo properties. This paper examines the influence of the local tidal structure on the halo mass function, the halo orientation, spin and the concentration-mass relation. We generalise the excursion set formalism to produce a halo mass function conditional on large-scale structure. Our model agrees well with simulations on large scales at which the density field is linear or weakly non-linear. Beyond this, our principal result is that f(R does affect halo abundances, the halo spin parameter and the concentration-mass relationship in an environment-independent way, whereas we find no appreciable deviation from LCDM for the mass function with fixed environment density, nor the alignment of the orientation and spin vectors of the halo to the eigenvectors of the local cosmic web. There is a general trend for greater deviation from LCDM in under-dense environments and for high-mass haloes, as expected from chameleon screening. Given the broad spectrum of MG theories, it is important to design new probes of MG. Despite the fact that we examine only three theories of MG, the techniques and methodology developed in this thesis can be applied to a wide variety of theories and can be extended to improve the results in this work.

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FEOLA, PASQUALE. « Astrophysical and Cosmological applications of Extended Theories of Gravity ». Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1006198.

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The aim of this thesis is to study the possible astrophysical and cosmological applications of Extended Theories of Gravity. In particular, Neutron Stars are studied, both on astrophysical and cosmological scale where, at cosmological level, they can assume a macroscopic configuration, i.e. a cosmological probe, which can be represented like a Fermionic condensate. The goal is to provide answers consistent with observational evidences that are not justified by General Relativity.

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Stabile, Antonio. « Constraining models of extended theories of gravity with terrestrial and astrophysical experiments ». Doctoral thesis, Universita degli studi di Salerno, 2015. http://hdl.handle.net/10556/1964.

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2013 - 2014
In this Thesis we report a general review of Extended Theories of Gravity and the fundamental aspects of General Relativity. We show the technicality of development of field equation with respect to Newtonian, Post-Newtonian approach and the post-Minkowskian limit. We analyse also the problem of how conformally transformed models behave in the weak field limit approximation. This issue could be extremely relevant in order to select conformally invariant physical quantities. The photon deflection is considered in the framework of the Newtonian Limit of a general class of f (R, Rαβ Rαβ, RαβγδRαβγδ) - Gravity where f is an unspecific function of the Ricci scalar R, Ricci tensor squareRαβ Rαβ and Riemann tensor square RαβγδRαβγδ. Studying in the weak-field approximation - Newtonian and Post-Newtonian limit - the geodesic and Lense-Thirring processions by using the recent experimental results of the Gravity Probe B and LARES satellite and using the damping of the orbital period of coalescing stellar binary systems, we impose constraints on the free parameters of such models of Extended Theories of Gravity. [edited by author]
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Hurgobin, Kirtika Juhi. « Stability and gravitational collapse in extended theories of gravity : from singularities to bouncing scenarios ». Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/31395.

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Einstein theory of General Relativity was well adapted and accepted until limitations in the form of an unexplained form of energy, referred today as Dark Energy, were observed. For this reason, modifications to the standard Theory of General Relativity were proposed: the so-called f(R) theories. In this dissertation, after a passage on the generalities of cosmology, we use the metric formalism technique to derive the field equations for the general f(R) function. Thereafter we analyse and check the solutions proposed in [85] for the quadratic model in f(R) gravity, for spherically symmetric and static neutron stars, using two different viable equations of state. We also check the accuracy of our code through a forward-backward integration technique, to show that in both directions, we obtain the same results. We then perform a thorough analysis in the case of f(R) = R1+ models. Results will show that for a negative value, we have non-Schwarzschild, but asymptotically flat solutions, for which we can use the backward integration technique to retrieve the solutions from the forward integration. However, for the case of positive values, we will show the existence of horizons, which deny us the possibility of using the backward integration technique. One of the aims of this thesis is to check, through the backward integration technique that we developed, whether the exact exterior solutions proposed in [86], are indeed realistic solutions for neutron stars. We will see that for some cases, we do have realistic profiles, while for some others, although solutions exist, they are rejected due to their disagreement with the equation of state used therein.

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Sbisa, Fulvio. « Modified theories of gravity ». Thesis, University of Portsmouth, 2013. https://researchportal.port.ac.uk/portal/en/theses/modified-theories-of-gravity(3b9310e3-5d97-4e48-aa05-0444d1e89363).html.

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The recent observational data in cosmology seem to indicate that the universe is currently expanding in an accelerated way. This unexpected conclusion can be explained assuming the presence of a non-vanishing yet extremely fine tuned cosmological constant, or invoking the existence of an exotic source of energy, dark energy, which is not observed in laboratory experiments yet seems to dominate the energy budget of the Universe. On the other hand, it may be that these observations are just signalling the fact that Einstein's General Relativity is not the correct description of gravity when we consider distances of the order of the present horizon of the universe. In order to study if the latter explanation is correct, we have to formulate new theories of the gravitational interaction, and see if they admit cosmological solutions which fit the observational data in a satisfactory way. Quite generally, modifying General Relativity introduces new degrees of freedom, which are responsible for the different large distance behaviour. On one hand, often these new degrees of freedom have negative kinetic energy, which implies that the theory is plagued by ghost instabilities. On the other hand, for a modified gravity theory to be phenomenologically viable it is necessary that the extra degrees of freedom are efficiently screened on terrestrial and astrophysical scales. One of the known mechanisms which can screen the extra degrees of freedom is the Vainshtein mechanism, which involves derivative self-interaction terms for these degrees of freedom. In this thesis, we consider two different models, the Cascading DGP and the dRGT massive gravity, which are candidates for viable models to modify gravity at very large distances. Regarding the Cascading DGP model, we consider the minimal (6D) set-up and we perform a perturbative analysis at first order of the behaviour of the gravitational field and of the branes position around background solutions where pure tension is localized on the 4D brane. We consider a specific realization of this set-up where the 5D brane can be considered thin with respect to the 4D one. We show that the thin limit of the 4D brane inside the (already thin) 5D brane is well defined, at least for the configurations that we consider, and confirm that the gravitational field on the 4D brane is finite for a general choice of the energymomentum tensor. We also confirm that there exists a critical tension which separates background configurations which possess a ghost among the perturbation modes, and background configurations which are ghost-free. We find a value for the critical tension which is different from the value which has been obtained in the literature; we comment on the difference between these two results, and perform a numeric calculation in a particular case where the exact solution is known to support the validity of our analysis. Regarding the dRGT massive gravity, we consider the static and spherically symmetric solutions of these theories, and we investigate the effectiveness of the Vainshtein screening mechanism. We focus on the branch of solutions in which the Vainshtein mechanism can occur, and we truncate the analysis to scales below the gravitational Compton wavelength, and consider the weak field limit for the gravitational potentials, while keeping all non-linearities of the mode which is involved in the screening. We determine analytically the number and properties of local solutions which exist asymptotically on large scales, and of local (inner) solutions which exist on small scales. Moreover, we analyze in detail in which cases the solutions match in an intermediate region. We show that asymptotically flat solutions connect only to inner configurations displaying the Vainshtein mechanism, while non asymptotically flat solutions can connect both with inner solutions which display the Vainshtein mechanism, or with solutions which display a self-shielding behaviour of the gravitational field. We show furthermore that there are some regions in the parameter space of the theory where global solutions do not exist, and characterize precisely in which regions the Vainshtein mechanism takes place.

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Clifton, Timothy. « Alternative theories of gravity ». Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612712.

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Sbisa', F. « MODIFIED THEORIES OF GRAVITY ». Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/214951.

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The recent observational data in cosmology seem to indicate that the universe is currently expanding in an accelerated way. This unexpected conclusion can be explained assuming the presence of a non-vanishing yet extremely fine tuned cosmological constant, or invoking the existence of an exotic source of energy, dark energy, which is not observed in laboratory experiments yet seems to dominate the energy budget of the Universe. On the other hand, it may be that these observations are just signalling the fact that Einstein's General Relativity is not the correct description of gravity when we consider distances of the order of the present horizon of the universe. In order to study if the latter explanation is correct, we have to formulate new theories of the gravitational interaction, and see if they admit cosmological solutions which fit the observational data in a satisfactory way. A necessary condition for the viability of a theory of ``modified gravity'' is that it has to reproduce to high precision the results of General Relativity in experimental setups where the latter is well tested. Quite in general, modifying General Relativity introduces new degrees of freedom, which are responsible for the different large distance behavior. For a modified gravity theory to be phenomenologically viable, it is necessary that the extra degrees of freedom are efficiently screened on terrestrial and astrophysical scales. One of the known mechanisms which can screen the extra degrees of freedom is known as the Vainshtein mechanism, which involves derivative self-interaction terms for these degrees of freedom. In this thesis, we consider a class of nonlinear massive gravity theories known as dGRT Massive Gravity. These theories are candidates as viable models to modify gravity at very large distances, and, apart from the mass, they contain two free parameters. We investigate the effectiveness of the Vainshtein screening mechanism in this class of theories. There are two branches of static and spherically symmetric solutions, and we consider only the branch in which the Vainshtein mechanism can occur. We truncate the analysis to scales below the gravitational Compton wavelength, and consider the weak f\mbox{}ield limit for the gravitational potentials, while keeping all non-linearities of the mode which is involved in the screening. We determine analytically the number and properties of local solutions which exist asymptotically on large scales, and of local (inner) solutions which exist on small scales. We analyze in detail in which cases the solutions match in an intermediate region. Asymptotically flat solutions connect only to inner configurations displaying the Vainshtein mechanism, while non asymptotically flat solutions can connect both with inner solutions which display the Vainshtein mechanism, or with solutions which display a self-shielding behaviour of the gravitational field. We show furthermore that there are some regions in the parameter space where global solutions do not exist, and characterise precisely in which regions of the phase space the Vainshtein mechanism takes place.

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Gullu, Ibrahim. « Massive Higher Derivative Gravity Theories ». Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613975/index.pdf.

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In this thesis massive higher derivative gravity theories are analyzed in some detail. One-particle scattering amplitude between two covariantly conserved sources mediated by a graviton exchange is found at tree-level in D dimensional (Anti)-de Sitter and flat spacetimes for the most general quadratic curvature theory augmented with the Pauli-Fierz mass term. From the amplitude expression, the Newtonian potential energies are calculated for various cases. Also, from this amplitude and the propagator structure, a three dimensional unitary theory is identified. In the second part of the thesis, the found three dimensional unitary theory is studied in more detail from a canonical point of view. The general higher order action is written in terms of gauge-invariant functions both in flat and de Sitter backgrounds. The analysis is extended by adding static sources, spinning masses and the gravitational Chern-Simons term separately to the theory in the case of flat spacetime. For all cases the microscopic spectrum and the masses are found. In the discussion of curved spacetime, the masses are found in the relativistic and non-relativistic limits. In the Appendix, some useful calculations that are frequently used in the bulk of the thesis are given.

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Bahamonde, Sebastian. « Modified teleparallel theories of gravity ». Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10055604/.

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Teleparallel gravity is an alternative formulation of gravity which has the same field equations as General Relativity (GR), therefore, it is also known as the Teleparallel equivalent of General Relativity (TEGR). This theory is a gauge theory of the translations with the torsion tensor being non-zero but with a vanishing curvature tensor, hence, the manifold is globally flat. An interesting approach for understanding the late-time accelerating behaviour of the Universe is called modified gravity where GR is extended or modified. In the same spirit, since TEGR is equivalent to GR, one can consider its modifications and study if they can describe the current cosmological observations. This thesis is devoted to studying several modified Teleparallel theories of gravity with emphasis on late-time cosmology. Those Teleparallel theories are in general different to the modified theories based on GR, but one can relate and classify them accordingly. Various Teleparallel theories are presented and studied such as Teleparallel scalar-tensor theories, quintom models, Teleparallel non-local gravity, and f(T,B) gravity and its extensions (coupled with matter, extensions of new GR and Gauss-Bonnet) where T is the scalar torsion and B is the boundary term which is related with the Ricci scalar via R=-T+B.

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Michele, Oliosi. « New viable theories of modified gravity : Minimal Theories and Quasidilaton ». Kyoto University, 2019. http://hdl.handle.net/2433/244509.

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Livres sur le sujet "Extended theories of gravity"

Xu, Liu-Jun, et Ji-Ping Huang. Transformation Thermotics and Extended Theories. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5908-0.

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Narlikar, Jayant V., et T. Padmanabhan. Gravity, Gauge Theories and Quantum Cosmology. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4508-1.

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Vecchiato, Alberto. Variational Approach to Gravity Field Theories. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51211-2.

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T, Schucker, dir. Differential geometry, guage theories and gravity. Cambridge : CUP, 1989.

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Narlikar, Jayant V. Gravity, Gauge Theories and Quantum Cosmology. Dordrecht : Springer Netherlands, 1986.

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1957-, Padmanabhan T., dir. Gravity, gauge theories, and quantum cosmology. Dordrecht, Holland : Reidel, 1986.

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T, Schücker, dir. Differential geometry, gauge theories, and gravity. Cambridge, [Cambridgeshire] : Cambridge University Press, 1987.

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Brane-localized gravity. Singapore : World Scientific, 2004.

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Richard, Holman, et United States. National Aeronautics and Space Administration., dir. Extended inflation from higher dimensional theories. [Washington, DC : National Aeronautics and Space Administration, 1990.

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Capozziello, Salvatore. Invariance principles and extended gravity : Theory and probes. New York : Nova Science Publishers, 2011.

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Chapitres de livres sur le sujet "Extended theories of gravity"

Kelly, Patrick F. « Constraints on Algebraically Extended Theories of Gravity ». Dans Gauge Theory and the Early Universe, 353–60. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3059-9_19.

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Martínez-Asencio, Jesús, Gonzalo J. Olmo et Diego Rubiera-García. « Black Holes in Extended Gravity Theories in Palatini Formalism ». Dans Progress in Mathematical Relativity, Gravitation and Cosmology, 333–37. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40157-2_48.

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Capozziello, Salvatore, et Mariafelicia De Laurentis. « Generating the Mass of Particles from Extended Theories of Gravity ». Dans Springer Proceedings in Physics, 15–28. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-00297-2_2.

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Aldrovandi, Ruben, et José Geraldo Pereira. « Gauge Theories and Gravitation ». Dans Teleparallel Gravity, 25–38. Dordrecht : Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5143-9_3.

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Capozziello, Salvatore, et Valerio Faraoni. « Extended gravity : a primer ». Dans Beyond Einstein Gravity, 1–40. Dordrecht : Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0165-6_1.

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’t Hooft, Gerard. « Quantum Gravity ». Dans Fundamental Theories of Physics, 89–90. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41285-6_6.

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Aschieri, Paolo. « Extended Gravity from Noncommutativity ». Dans Springer Proceedings in Physics, 151–64. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-00297-2_15.

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Asselmeyer-Maluga, Torsten. « Smooth Quantum Gravity : Exotic Smoothness and Quantum Gravity ». Dans Fundamental Theories of Physics, 247–308. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31299-6_15.

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Anderson, Edward. « Quantum Gravity Programs ». Dans Fundamental Theories of Physics, 157–79. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58848-3_11.

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Martín-Moruno, Prado. « Horndeski/Galileon Theories ». Dans Modified Gravity and Cosmology, 79–87. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83715-0_6.

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Actes de conférences sur le sujet "Extended theories of gravity"

PERIVOLAROPOULOS, L. « OBSERVATIONAL SIGNATURE OF EXTENDED GRAVITY THEORIES ». Dans Proceedings of the Sixth International Workshop. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812770288_0084.

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LOBO, FRANCISCO S. N., et TIBERIU HARKO. « EXTENDED F(R, LM) THEORIES OF GRAVITY ». Dans Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0110.

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Mastrototaro, L. « Testing extended theories of gravity with GRBs ». Dans Proceedings of the MG16 Meeting on General Relativity. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811269776_0311.

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Cruz-Dombriz, Alvaro de la. « Limitations of cosmography in extended theories of gravity ». Dans 11th International Workshop Dark Side of the Universe 2015. Trieste, Italy : Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.268.0007.

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VECCHIATO, A., M. GAI, S. CAPOZZIELLO et M. DE LAURENTIS. « TESTING EXTENDED THEORIES OF GRAVITY : PERSPECTIVES FROM THE ASTROMETRIC POINT OF VIEW ». Dans Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0101.

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Francaviglia, Mauro, et Lorenzo Fatibene. « From the Ehlers-Pirani-Schild analysis on the foundations of gravitational theories to extended theories of gravity and dark matter ». Dans Proceedings of the Corfu Summer Institute 2011. Trieste, Italy : Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.155.0054.

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Notash, Leila, et Derek McColl. « Workspace Investigation of Cable-Driven Robots With Non-Negligible Cable Mass and Antipodal Method ». Dans ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85300.

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The significance of gravity, cable density and elasticity on cable tension and manipulator workspace is investigated. Formulations of the cable tension vector are discussed. In addition, implementation of the antipodal theorem criteria for the workspace boundary characterization of planar cable-driven robot manipulators is presented when the mass and elasticity of cables are included. It is demonstrated that unlike the linear model, the external force could have more prominent effect on the workspace. Specifically, depending on the cable properties, platform orientation and manipulator design constraints, for the catenary cable model, the extended workspace due to external wrench may be divided into disjoint regions.

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Sobreiro, Rodrigo Ferreira. « Gauge theories and gravity ». Dans 7th International Conference on Mathematical Methods in Physics. Trieste, Italy : Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.175.0019.

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Rivelles, Victor O. « Noncommutative Theories and Gravity ». Dans Fourth International Winter Conference on Mathematical Methods in Physics. Trieste, Italy : Sissa Medialab, 2004. http://dx.doi.org/10.22323/1.013.0029.

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MANN, ROBERT. « A6 : ALTERNATIVE THEORIES OF GRAVITY ». Dans Proceedings of the 16th International Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776556_0022.

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Rapports d'organisations sur le sujet "Extended theories of gravity"

Perelstein, M. Topics in Theories of Quantum Gravity. Office of Scientific and Technical Information (OSTI), avril 2005. http://dx.doi.org/10.2172/839827.

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Lim, Hyun. Nonlinear Dynamics of Modified Gravity Theories. Office of Scientific and Technical Information (OSTI), décembre 2020. http://dx.doi.org/10.2172/1727409.

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Dicus, D. A., B. Dutta et S. Nandi. Top quark signatures in extended color theories. Office of Scientific and Technical Information (OSTI), décembre 1994. http://dx.doi.org/10.2172/67471.

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Evenett, Simon, et Wolfgang Keller. On Theories Explaining the Success of the Gravity Equation. Cambridge, MA : National Bureau of Economic Research, avril 1998. http://dx.doi.org/10.3386/w6529.

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Subhash, Rajpoot. Studies in gravity, supersymmetry, supergravity and extended objects. Office of Scientific and Technical Information (OSTI), août 2013. http://dx.doi.org/10.2172/1110652.

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Echeverria-Enriquez, Arturo, Manuel de Leon et Miguel C. Munoz-Lecanda. Extended Hamiltonian Formalism of Field Theories : Variational Aspects and Other Topics. GIQ, 2012. http://dx.doi.org/10.7546/giq-7-2006-116-127.

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Rizzo, Thomas G. Using Scalars to Probe Theories of Low Scale Quantum Gravity. Office of Scientific and Technical Information (OSTI), mars 1999. http://dx.doi.org/10.2172/10016.

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Morales, Eduardo, Gloria Sheu et Andrés Zahler. Gravity and Extended Gravity : Using Moment Inequalities to Estimate a Model of Export Entry. Cambridge, MA : National Bureau of Economic Research, février 2014. http://dx.doi.org/10.3386/w19916.

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Faraggi, A. E., et J. C. Pati. Meeting the constraint of neutrino-Higgsino mixing in gravity unified theories. Office of Scientific and Technical Information (OSTI), février 1997. http://dx.doi.org/10.2172/466855.

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Awada, M., et Zongan Qiu. The critical points of the multimatrix model as the theories of 2-d W-gravity. Office of Scientific and Technical Information (OSTI), mars 1990. http://dx.doi.org/10.2172/6767420.

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