Results 41 to 50 of about 79,313 (303)
HOLOGRAPHIC MODIFIED GRAVITY [PDF]
International Journal of Modern Physics D, 2008 In this paper, we investigate cosmological application of holographic dark energy density in the modified gravity framework. We employ the holographic model of dark energy to obtain the equation of state for the holographic energy density in a spatially flat universe. Our calculation shows that, taking ΩΛ = 0.73 for the present time, it is possible to
openaire +3 more sources
PhD thesis : Compact objects in modified theories of gravity [PDF]
, 2022 The formulation of General Relativity by Albert Einstein in 1915 revolutionised our understanding of the gravitational interaction. However, despite its tremendous successes, this theory struggle to explain certain important phenomena such as the ...
Ducobu, Ludovic
core
Reissner–Nordström Anti-de Sitter Black Holes in Mimetic F(R) Gravity
Universe, 2016 In this paper, we study under which conditions the Reissner–Nordström anti-de Sitter black hole can be a solution of the vacuum mimetic F ( R ) gravity with Lagrange multiplier and mimetic scalar potential.
V. K. Oikonomou
doaj +1 more source
Constraining f(T,T) gravity with gravitational baryogenesis
Physics Letters B, 2023 Gravitational baryogenesis is one of the mechanisms which help us to explore more about our early universe, especially baryon-anti-baryon asymmetry.
Sai Swagat Mishra +2 more
doaj +1 more source
Exact rotating black hole solutions for f(R) gravity by modified Newman Janis algorithm
European Physical Journal C: Particles and Fields, 2023 We show that the f(R)-gravity theories with constant Ricci scalar in the Jordan/Einstein frame can be described by Einstein or Einstein–Maxwell gravity with a cosmological term and a modified gravitational constant.
Pankaj Chaturvedi +3 more
doaj +1 more source
Critical gravity in the Chern–Simons modified gravity [PDF]
The European Physical Journal C, 2011 13 pages, 1 figure, version to appear in ...
Moon, Taeyoon, Myung, Yun Soo
openaire +2 more sources
Rastall gravity is equivalent to Einstein gravity
Physics Letters B, 2018 Rastall gravity, originally developed in 1972, is currently undergoing a significant surge in popularity. Rastall gravity purports to be a modified theory of gravity, with a non-conserved stress–energy tensor, and an unusual non-minimal coupling between ...
Matt Visser
doaj +1 more source
ON EXPONENTIAL MODIFIED GRAVITY [PDF]
International Journal of Modern Physics A, 2013 A modified theory of gravity with the function F(R) = R exp (αR) instead of Ricci scalar R in the Einstein–Hilbert action is considered and analyzed. The action of the model is converted into Einstein–Hilbert action at small value of the parameter α. From local tests we obtain a bound on the parameter α ≤ 10-6 cm 2.
openaire +2 more sources
The P-V phase transition of the FRW universe
European Physical Journal C: Particles and Fields, 2022 We define thermodynamic pressure P by work density W as the conjugate quantity of thermodynamic volume V from field equation. We derive the equations of state P=P(V, T) for the Friedmann–Robertson–Walker (FRW) universe in Einstein gravity and a modified ...
Shi-Bei Kong +4 more
doaj +1 more source
, 2013 added references; made some clarifications; 8 ...
Dimitrijevic, Ivan +3 more
openaire +2 more sources