Results 11 to 20 of about 115,585,122 (266)
Energy conditions in modified gravity [PDF]
Physics Letters B, 2014 4 pages. V2: 5 pages; version to appear in Physics Letters B. V3: typo in Eq.
CAPOZZIELLO, SALVATORE +2 more
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Validity of energy conditions of matter in traversable wormholes under the f(Q) modified gravity theory [PDF]
The European Physical Journal Plus18 pages, 5 ...
Jianbo Lu +4 more
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Energy conditions in Gauss–Bonnet gravity
European Physical Journal C: Particles and FieldsWe study the Energy Conditions in modified $$f(\mathcal {G})$$ f ( G ) gravity, with $$\mathcal {G}$$ G being the topological Gauss–Bonnet term. Then we use the cosmographic parameters to constrain the functional form of the gravitational action and ...
Francesco Bajardi
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Initial conditions in chaotic inflation with modified gravity [PDF]
EPJ Web of Conferences, 2017 Evolution in chaotic inflationary models begins at a high energy density with semi-classical initial conditions presumably consistent with a universal quantum nature of all the fundamental interactions: each quantum contributes the same amount to the ...
Gorbunov Dmitry
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The viability of modified gravity theories [PDF]
, 2009 PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
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Energy condition in unimodular f(R, T) gravity
European Physical Journal C: Particles and Fields, 2021 We study an interesting alternative of modified gravity theory, namely, the unimodular f(R, T) gravity in which R is the Ricci scalar and T is the trace of the stress–energy tensor. We study the viability of the model by using the energy conditions.
Fateme Rajabi, Kourosh Nozari
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Results in Physics, 2023 The focus of this research is to investigate conformal vector fields (CVFs) of Bianchi type I space–times in modified teleparallel gravity (MTG). In order to determine such vector fields, we make a classification of said space–times. As a result, we discover thirty-one distinct Bianchi type I classes in the MTG.
Shabeela Malik +5 more
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Impact of curvature based geometric constraints on F(R) theory
European Physical Journal C: Particles and Fields, 2022 Theories of gravity are fundamentally a relation between matter and the geometric structure of the underlying spacetime. So once we put some additional restrictions on the spacetime geometry, the theory of gravity is bound to get the impact, irrespective
Tee-How Loo +3 more
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Wormholes in viable $$f(R)$$ f ( R ) modified theories of gravity and weak energy condition [PDF]
The European Physical Journal C, 2015 In this work wormholes in viable $f(R)$ gravity models are analysed. We are interested in exact solutions for stress-energy tensor components depending on different shape and redshift functions. Several solutions of gravitational equations for different $f(R)$ models are examined.
Pavlovic, Petar, Sossich, Marko
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The dynamics of cosmological scenarios inspired by quantum gravity [PDF]
, 2006 PhDIn this thesis we study the dynamics of cosmological scenarios inspired by quantum gravity. Part I investigates novel features of the semi-classical regime of homogeneous and isotropic loop quantum cosmology.
Mulryne, David James
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