Energy conditions in modified f(G) gravity
Sign Up to like & getrecommendations! Published in 2017 at "General Relativity and Gravitation"
DOI: 10.1007/s10714-017-2276-x
Abstract: In this paper, we have considered flat Friedmann–Lemaître–Robertson–Walker metric in the framework of perfect fluid models and modified f(G) gravity (where G is the Gauss Bonnet invariant). Particularly, we have considered particular realistic f(G) configurations… read more here.
Keywords: conditions modified; energy conditions; modified gravity;
Galaxy rotation curves in modified gravity models
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/08/012
Abstract: In this work, we investigate the possibility that the galaxy rotation curves can be explained in the framework of modified gravity models that introduce a Yukawa term in the gravitational potential. We include dark matter… read more here.
Keywords: rotation curves; gravity models; modified gravity; galaxy rotation ... See more keywords
Phenomenology in type-I minimally modified gravity
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/01/017
Abstract: We study cosmology in a class of minimally modified gravity (MMG) with two local gravitational degrees of freedom. We classify modified gravity theories into type-I and type-II: theories of type-I have an Einstein frame and… read more here.
Keywords: phenomenology type; cosmology; modified gravity; minimally modified ... See more keywords
Investigating the degeneracy between modified gravity and massive neutrinos with redshift-space distortions
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/06/040
Abstract: There is a well known degeneracy between the enhancement of the growth of large-scale structure produced by modified gravity models and the suppression due to the free-streaming of massive neutrinos at late times. This makes… read more here.
Keywords: massive neutrinos; degeneracy; redshift space; modified gravity ... See more keywords
A generalized Kasner transition for bouncing Bianchi I models in modified gravity theories
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/12/039
Abstract: We derive transition rules for Kasner exponents in bouncing Bianchi I models with generic perfect fluid matter fields for a broad class of modified gravity theories where cosmological singularities are resolved and replaced by a… read more here.
Keywords: bianchi models; bouncing bianchi; cosmology; modified gravity ... See more keywords
Relativistic corrections to the growth of structure in modified gravity
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/01/013
Abstract: We present a method to introduce relativistic corrections including linear dark energy perturbations in Horndeski theory into Newtonian simulations based on the N-body gauge approach. We assume that standard matter species (cold dark matter, baryons,… read more here.
Keywords: energy; matter; modified gravity; relativistic corrections ... See more keywords
Constraining scalar-tensor modified gravity with gravitational waves and large scale structure surveys
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/01/068
Abstract: The first multi-messenger gravitational wave event has had a transformative effect on the space of modified gravity models. In this paper we study the enhanced tests of gravity that are possible with a future set… read more here.
Keywords: large scale; gravitational waves; modified gravity; scalar tensor ... See more keywords
Modified gravity or imperfect dark matter: a model-independent discrimination
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/02/020
Abstract: We analyze how to parametrize general modifications of the dark matter perturbations equations in a model-independent way. We prove that a general model with an imperfect and non-conserved dark matter fluid with bulk and shear… read more here.
Keywords: matter; dark matter; model independent; modified gravity ... See more keywords
Constraints on modified gravity from the BOSS galaxy survey
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2023/04/038
Abstract: We develop a pipeline to set new constraints on scale-independent modified gravity, from the galaxy power spectrum in redshift space of BOSS DR12. The latter is modelled using the effective field theory of large-scale structure… read more here.
Keywords: modified gravity; gravity; constraints modified; gravity boss ... See more keywords
Fast approximate methods for modified gravity cosmological simulations
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa333
Abstract: The accelerated expansion of the Universe poses a major theoretical puzzle. Although the assumption of a non-zero cosmological constant provides a minimal extension of general relativity that is consistent with observational data, many theories of… read more here.
Keywords: approximate methods; methods modified; modified gravity; gravity cosmological ... See more keywords
Observational constraints on Tsallis modified gravity
Sign Up to like & getrecommendations! Published in 2021 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stab2671
Abstract: The thermodynamics-gravity conjecture reveals that one can derive the gravitational field equations by using the first law of thermodynamics and vice versa. Considering the entropy associated with the horizon in the form of non-extensive Tsallis… read more here.
Keywords: thermodynamics; tmg model; modified gravity; tsallis modified ... See more keywords