Results 1 to 10 of about 26,635,104 (298)
k-essence f(R) gravity inflation
Nuclear Physics B, 2019 In this work we study a modified version of f(R) gravity in which higher order kinetic terms of a scalar field are added in the action of vacuum f(R) gravity. This type of theory is a type of k-essence f(R) gravity, and it belongs to the general class of
S. Nojiri, S.D. Odintsov, V.K. Oikonomou
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Integral F(R) gravity and saddle point condition as a remedy for the H0-tension
Nuclear Physics B, 2022 In this work, we shall provide an F(R) gravity theoretical framework for solving the H0-tension. Specifically, by exploiting the F(R) gravity correspondence with a scalar-tensor theory, we shall provide a condition in which when it is satisfied, the H0 ...
S. Nojiri, S.D. Odintsov, V.K. Oikonomou
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Bounce cosmology in $$f({\mathcal {R}})$$ f ( R ) gravity
European Physical Journal C: Particles and Fields, 2021 In this paper, we analyze the modified $$f({\mathcal {R}})$$ f ( R ) gravity models in Friedmann–Lemaître–Robertson–Walker (FLRW) background. The actions of bouncing cosmology are studied under consideration of different viable models in $$f({\mathcal {R}
M. Ilyas, W. U. Rahman
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Legendre scalarization in gravity and cosmology
European Physical Journal C: Particles and Fields, 2023 We propose a new formulation of f(R) gravity, dubbed scalarized f(R) gravity, in which the Legendre transform is included as a dynamical term. This leads to a theory with second-order field equations that describes general relativity with a self ...
Spiros Cotsakis +2 more
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The contribution Hans Adolph Buchdahl f(R) gravity [PDF]
EPJ Web of ConferencesHans Adolph Buchdahl was born in Mainz, Germany, into a Jewish family. He was an Australian physicist, and he was born on 7 July 1919 and died on 7 January 2010. He worked on general relativity, thermodynamics, and optics.
Lazarov Nenad Dj.
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Asymptotically flat vacuum solution in modified theory of Einstein’s gravity
European Physical Journal C: Particles and Fields, 2019 A number of recent observations have suggested that the Einstein’s theory of general relativity may not be the ultimate theory of gravity. The f(R) gravity model with R being the scalar curvature turns out to be one of the best bet to surpass the general
Surajit Kalita, Banibrata Mukhopadhyay
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Generalised nonminimally gravity-matter coupled theory
European Physical Journal C: Particles and Fields, 2018 In this paper, a new generalised gravity-matter coupled theory of gravity is presented. This theory is constructed by assuming an action with an arbitrary function $$f(T,B,L_m)$$ f(T,B,Lm) which depends on the scalar torsion T, the boundary term $$B ...
Sebastian Bahamonde
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Pre-inflationary bounce effects on primordial gravitational waves of f(R) gravity
Physics Letters B, 2022 In this work we shall study a possible pre-inflationary scenario for our Universe and how this might be realized by f(R) gravity. Specifically, we shall introduce a scenario in which the Universe in the pre-inflationary era contracts until it reaches a ...
S.D. Odintsov, V.K. Oikonomou
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Massive white dwarfs in $$f(\mathtt {R,L_m})$$ f ( R , L m ) gravity
European Physical Journal C: Particles and Fields, 2022 In this work, we investigate the equilibrium configurations of massive white dwarfs (MWD) in the context of modified gravity, namely $$f(\mathtt {R,L_m})$$ f ( R , L m ) gravity, where $$\mathtt {R}$$ R stands for the Ricci scalar and $$\mathtt {L_m}$$ L
R. V. Lobato +3 more
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A study of cylindrically symmetric solutions in $$f(R, \phi , X)$$ f ( R , ϕ , X ) theory of gravity
European Physical Journal C: Particles and Fields, 2022 In this article, we aim to investigate some cylindrically symmetric solutions in a very well known modified theory named as $$f(R, \phi , X)$$ f ( R , ϕ , X ) theory of gravity, where the terms R, $$\phi $$ ϕ and X are clarified as Ricci Scalar, scalar ...
Adnan Malik +3 more
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