Results 61 to 70 of about 540,486 (189)
GRAVITY FROM A MODIFIED COMMUTATOR [PDF]
International Journal of Modern Physics D, 2005 We show that a suitably chosen position-momentum commutator can elegantly describe many features of gravity, including the IR/UV correspondence and dimensional reduction ("holography"). Using the most simplistic example based on dimensional analysis of black holes, we construct a commutator which qualitatively exhibits these novel properties of ...
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Modified gravity and the CMB [PDF]
Physical Review D, 2012 15 pages, 10 figures, published ...
Brax, Philippe, Davis, Anne-Christine
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Weak Lensing Probes of Modified Gravity
, 2008 We study the effect of modifications to General Relativity on large scale weak lensing observables. In particular, we consider three modified gravity scenarios: f(R) gravity, the DGP model, and TeVeS theory.
Fabian Schmidt, S. Dodelson
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Non-singular modified gravity: the unification of the inflation, dark energy and dark mater [PDF]
, 2009 Using the fluid representation, we formulate the conditions for the appearance of all four types finite-time future singularity in modified gravity in accelerating FRW universe.
Nojiri, Shin'ichi, Odintsov, Sergei D.
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Entropy, 2012 Along this review, we focus on the study of several properties of modified gravity theories, in particular on black-hole solutions and its comparison with those solutions in General Relativity, and on Friedmann–Lemaˆıtre–Robertson–Walker metrics.
Diego Sáez-Gómez +1 more
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Dark energy and modified gravity [PDF]
, 2010 Explanations of the late-time cosmic acceleration within the framework of general relativity are plagued by difficulties. General relativistic models are mostly based on a dark energy field with fine-tuned, unnatural properties. There is a great variety of models, but all share one feature in common -- an inability to account for the gravitational ...
Durrer, Ruth, Maartens, Roy
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Gravitational baryogenesis in f(T, Lm) gravity
Nuclear Physics BThe observed matter–antimatter asymmetry of the Universe remains a fundamental challenge in modern physics. In this work, we explore gravitational baryogenesis within the framework of f(T, Lm) gravity, where the gravitational Lagrangian depends on both ...
Daniel F P Cruz +2 more
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Brans–Dicke Unimodular Gravity
Universe, 2022 We propose a unimodular version of the Brans–Dicke theory designed with a constrained Lagrangian formulation. The resulting field equations are traceless.
Alexandre M. R. Almeida +5 more
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The stability of modified gravity models
, 2005 Conditions for the existence and stability of de Sitter space in modified gravity are derived by considering inhomogeneous perturbations in a gauge-invariant formalism. The stability condition coincides with the corresponding condition for stability with
A. R. Liddle +11 more
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General Relativity solutions in modified gravity
Physics Letters B, 2018 Recent gravitational wave observations of binary black hole mergers and a binary neutron star merger by LIGO and Virgo Collaborations associated with its optical counterpart constrain deviation from General Relativity (GR) both on strong-field regime and
Hayato Motohashi, Masato Minamitsuji
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