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;
Emergent modified gravity
Sign Up to like & getrecommendations! Published in 2024 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ad36a8
Abstract: A 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. The usual uniqueness theorems… read more here.
Keywords: gravity emergent; modified gravity; gravity; emergent modified ... See more keywords
Cosmologically viable solutions in geometric modified gravity
Sign Up to like & getrecommendations! Published in 2025 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ae1c8e
Abstract: The discovery of the accelerated expansion of the Universe highlighted General Relativity’s inability to naturally account for dark energy without invoking a finely tuned cosmological constant. In response, a wide range of alternative paradigms have… read more here.
Keywords: gravity cosmologically; gravity; solutions geometric; viable solutions ... See more keywords
Quazinormal modes and greybody factor of black hole surrounded by a quintessence in the S-V-T modified gravity as well as shadow
Sign Up to like & getrecommendations! Published in 2024 at "Physica Scripta"
DOI: 10.1088/1402-4896/ad4069
Abstract: The purpose of this study is to investigate the quasinormal modes (QNMs), greybody factors (GFs) and shadows in a plasma of a black hole (BH) surrounded by an exotic fluid of quintessence type in a… read more here.
Keywords: black hole; hole surrounded; modified gravity; greybody ... See more keywords
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