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Modified Gravity and Cosmology [PDF]
Physics Reports, 2011 In this review we present a thoroughly comprehensive survey of recent work on modified theories of gravity and their cosmological consequences. Amongst other things, we cover General Relativity, scalar–tensor, Einstein–aether, and Bimetric theories, as ...
T. Clifton +3 more
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Limited modified gravity [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 We systematically assess several limiting cases of modified gravity, where particular theoretical or observational conditions hold. This framework includes the well known scalar-tensor gravity and No Slip Gravity and No Run Gravity, and we extend it to ...
E. Linder
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Emergent modified gravity [PDF]
Classical and Quantum GravityA complete canonical formulation of general covariance makes it possible to construct new modified theories of gravity that are not of higher-curvature form, as shown here in a spherically symmetric setting.
M. Bojowald, Erick I. Duque
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Modified gravity: A unified approach [PDF]
Physical Review D, 2021 Starting from the original Einstein action, sometimes called the Gamma squared action, we propose a new setup to formulate modified theories of gravity.
C. Boehmer, Erik Jensko
semanticscholar +5 more sources
Charged gravastars in modified gravity [PDF]
Physical Review D, 2019 In this paper, we investigate the effects of electromagnetic field on the isotropic spherical gravastar models in metric $f(R,T)$ gravity. For this purpose, we have explored singularity-free exact models of relativistic spheres with a specific equation ...
Z. Yousaf +3 more
semanticscholar +4 more sources
Modified Gravity as Entropic Cosmology
UniverseThe present work reveals a direct correspondence between modified theories of gravity (cosmology) and entropic cosmology based on the thermodynamics of apparent horizon.
Shin’ichi Nojiri +3 more
doaj +3 more sources
On the Conformal Frames in f(R) Gravity
Universe, 2022 We discuss gravitational physics in the Jordan and Einstein frames of f(R) gravity coupled to the Standard Model. We elucidate the way in which the observed gravitational coupling arises in the Einstein frame for generic f(R).
Yuri Shtanov
doaj +1 more source
Big Bang Nucleosynthesis Constraints on f (T, TG) Gravity
Universe, 2022 We confront f(T,TG) gravity, with big bang nucleosynthesis (BBN) requirements. The former is obtained using both the torsion scalar, as well as the teleparallel equivalent of the Gauss–Bonnet term, in the Lagrangian, resulting to modified Friedmann ...
Petros Asimakis +3 more
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Probing modified gravity theories with multiple measurements of high-redshift quasars [PDF]
, 2021 In this paper, we quantify the ability of multiple measurements of high-redshift quasars (QSOs) to constrain several theories of modified gravity, including the DvaliGabadadze-Porrati braneworld scenario, generalized Chaplygin gas, f(T ) modified gravity,
Yujie Lian +5 more
semanticscholar +1 more source
Black hole perturbations in modified gravity [PDF]
Physical Review D, 2021 We study the linear perturbations about nonrotating black holes in the context of degenerate higher-order scalar-tensor (DHOST) theories, using a systematic approach that extracts the asymptotic behaviour of perturbations (at spatial infinity and near ...
D. Langlois, K. Noui, Hugo Roussille
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