Results 11 to 20 of about 540,486 (189)

On Modified Gravity [PDF]

, 2012
We consider some aspects of nonlocal modified gravity, where nonlocality is of the type $R \mathcal{F}(\Box) R$. In particular, using ansatz of the form $\Box R = c R^\gamma,$ we find a few $R(t)$ solutions for the spatially flat FLRW metric.
A.S. Koshelev, B. Dragovich, I.Ya. Aref’eva, N. Barnaby, S. Nojiri, T. Biswas, T. Biswas, T.P. Sotiriou   +7 more
core   +3 more sources

New Modified Mimetic Gravity [PDF]

International Journal of Geometric Methods in Modern Physics, 2014
A modified Mimetic gravity (MMG) is proposed as a generalization of general relativity. The model contain a physical metric which is function of an auxiliary (unphysical) metric and a Lyra's metric.
Altaibayeva, Aziza, Momeni, Davood, Myrzakulov, Ratbay   +2 more
core   +2 more sources

Cosmological tests of modified gravity [PDF]

Reports on Progress in Physics, 2016
82 pages, 28 figures. This review is partly based on arXiv:1304.0601, arXiv:1305.0279 and arXiv:1503.06673.
Kazuya Koyama
openaire   +7 more sources

Modified gravity and cosmology

Physics Reports, 2012
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 well as TeVeS, f(R), general higher-order theories, Horava-Lifschitz gravity, Galileons, Ghost ...
Clifton, T., Ferreira, P. G., Padilla, A., Skordis, C., Clifton, T., Ferreira, P. G., Padilla, A., Skordis, C.   +7 more
openaire   +7 more sources

On exponential modified gravity [PDF]

International Journal of Modern Physics A, 2013
A modified theory of gravity with the function $F(R) = R\exp(\alpha R)$ instead of Ricci scalar $R$ in the Einstein$-$Hilbert action is considered and analyzed.
Kruglov, S. I.
core   +2 more sources

Maxwell-modified metric affine gravity [PDF]

European Physical Journal C: Particles and Fields, 2021
We present a gauge formulation of the special affine algebra extended to include an antisymmetric tensorial generator belonging to the tensor representation of the special linear group.
Oktay Cebecioğlu, Salih Kibaroğlu
doaj   +5 more sources

Mass Screening in Modified Gravity

Classical and Quantum Gravity, 2007
Models of modified gravity introduce extra degrees of freedom, which for consistency with the data, should be suppressed at observable scales. In the models that share properties of massive gravity such a suppression is due to nonlinear interactions: An ...
, Alberto Iglesias, Arkani-Hamed N, Cardoso A Koyama K Seahra S S Silva F P, Charmousis C, Corradini O Koyama K Tasinato G, Creminelli P, de Rham C Dvali G Hofmann S Khoury J Pujolas O Redi M Tolley A J, Deffayet C, Dubovsky S L, Dvali G, Gabadadze G, Gregory Gabadadze, Gregory R, Iorio L, Iorio L, Iorio L, Izumi K, Kaloper N, Kaloper N, Koyama K, Luty M A, Nicolis A, Perlmutter S, Riess A G, Rubakov V A, Rubakov V A, Sawicki I Carroll S M, Shifman M, Song Y S Sawicki I Hu W, Wald R M, Zakharov V I, Zakharov V I   +32 more
core   +2 more sources

Critical gravity in the Chern-Simons modified gravity [PDF]

The European Physical Journal C, 2011
We perform the perturbation analysis of the Chern-Simons modified gravity around the AdS$_4$ spacetimes (its curvature radius $\ell$) to obtain the critical gravity.
Moon, Taeyoon, Myung, Yun Soo
core   +2 more sources

Ghost Constraints on Modified Gravity [PDF]

Physics Letters B, 2004
We show that general infrared modifications of the Einstein-Hilbert action obtained by addition of curvature invariants are not viable. These modifications contain either ghosts or light gravity scalars.
Alvaro Núñez, Barrow, Carroll, Carroll, Deffayet, Dick, Dolgov, Dvali, Dvali, Dvali, Dvali, Flanagan, Kalara, Meng, Nicolis, Nojiri, Núñez, Perlmutter, Riess, Slava Solganik, Tonry, Van Nieuwenhuizen, Van Nieuwenhuizen, Vollick   +23 more
core   +4 more sources

Modified gravity tomography [PDF]

Physics Letters B, 2012
7 pages, 1 figure, minor ...
Brax, P., Davis, A.-C., Li, B.
openaire   +4 more sources