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Modified gravity revealed along geodesic tracks [PDF]
European Physical Journal C: Particles and Fields, 2018 The study of the dynamics of a two-body system in modified gravity constitutes a more complex problem than in Newtonian gravity. Numerical methods are typically needed to solve the equations of geodesics.
Mariafelicia De Laurentis +2 more
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Rainbow Gravity Corrections to the Entropic Force
Advances in High Energy Physics, 2018 The entropic force attracts a lot of interest for its multifunctional properties. For instance, Einstein’s field equation, Newton’s law of gravitation, and the Friedmann equation can be derived from the entropic force. In this paper, utilizing a new kind
Zhong-Wen Feng, Shu-Zheng Yang
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European Physical Journal C: Particles and Fields, 2021 We develop an approach to the theory of relativistic geometric flows and emergent gravity defined by entropy functionals and related statistical thermodynamics models. Nonholonomic deformations of G.
Sergiu I. Vacaru +2 more
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On the Conformal Frames in f(R) Gravity
Universe, 2022 We discuss gravitational physics in the Jordan and Einstein frames of f(R) gravity coupled to the Standard Model. We elucidate the way in which the observed gravitational coupling arises in the Einstein frame for generic f(R).
Yuri Shtanov
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Big Bang Nucleosynthesis Constraints on f (T, TG) Gravity
Universe, 2022 We confront f(T,TG) gravity, with big bang nucleosynthesis (BBN) requirements. The former is obtained using both the torsion scalar, as well as the teleparallel equivalent of the Gauss–Bonnet term, in the Lagrangian, resulting to modified Friedmann ...
Petros Asimakis +3 more
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Mathematics, 2023 In this work, it is shown that the geometry of a gravity field generated by a spheroid with low eccentricity can be described with the help of a newly modified Helmholtz equation.
Gerassimos Manoussakis
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Testing Screened Modified Gravity
Universe, 2021 Long range scalar fields with a coupling to matter appear to violate known bounds on gravitation in the solar system and the laboratory. This is evaded thanks to screening mechanisms.
Philippe Brax +3 more
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Universe, 2022 Scalar Tensor Vector Gravity (STVG) or MOdified Gravity (MOG) is a metric theory of gravity with dynamical scalar fields and a massive vector field introduced in addition to the metric tensor.
Sreekanth Harikumar
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Non-conserved modified gravity theory
European Physical Journal C: Particles and Fields, 2023 In the curved spacetime the conservation of stress-energy tensor $${\mathcal {T}}_{\,\,\,\,\, \mu ;\nu }^{\nu }=0$$ T μ ; ν ν = 0 has been questioned by Rastall. However, this idea in which $${\mathcal {T}}_{\,\,\,\,\, \mu ;\nu }^{\nu }=\lambda R_{,\mu }$
H. R. Fazlollahi
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Perturbations of Spinning Black Holes beyond General Relativity: Modified Teukolsky Equation
Physical Review X, 2023 The detection of gravitational waves from compact binary mergers by the LIGO/Virgo Collaboration has, for the first time, allowed for tests of relativistic gravity in the strong, dynamical, and nonlinear regime.
Dongjun Li +3 more
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