Results 21 to 30 of about 1,952,488 (304)
International Journal of Modern Physics D, 2008 We describe how a certain simple modification of general relativity, in which the local cosmological constant is allowed to depend on the space–time curvature, predicts the existence of halos of modified gravity surrounding spherically symmetric objects. We show that the gravitational mass of an object weighed together with its halo can be much larger
Krasnov, Kirill, Shtanov, Yuri
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 +1 more source
Modeling Human Perception of Orientation in Altered Gravity
Frontiers in Systems Neuroscience, 2015 Altered gravity environments, such as those experienced by astronauts, impact spatial orientation perception and can lead to spatial disorientation and sensorimotor impairment.
Torin K. Clark +5 more
doaj +1 more source
Asymptotically flat vacuum solution for a rotating black hole in a modified gravity theory
European Physical Journal C: Particles and Fields, 2022 The theory of f(R)-gravity is one of the theories of modified Einstein gravity. The vacuum solution, on the other hand, of the field equation is the solution for black hole geometry.
Arghya Ranjan Das +1 more
doaj +1 more source
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
Stability in generalized Modified Gravity [PDF]
AIP Conference Proceedings, 2009 The stability issue of a large class of modified gravitational models is discussed with particular emphasis to de Sitter solutions. Three approaches are briefly presented and the generalization to more general cases is mentioned.
S. Zerbini, Shaaban Khalil
openaire +5 more sources
Editorial to the Special Issue “Probing New Physics with Black Holes”
Universe, 2020 Black holes are fantastic laboratories for probing new physics. Both theoretically and experimentally, many new ideas are emerging to use them as tools for understanding better quantum gravity or classical gravity beyond general relativity.
Aurélien Barrau
doaj +1 more source
Testing Modified Gravity with the Sunyaev Zel'dovich Effect [PDF]
, 2022 ): In this thesis, we present a method to test modified-gravity models. Growth of large-scale structures is directly related to the governing gravity theory.
Upadhyay, Vikram
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
, 2010 The observable universe could be a 1+3-surface (the “brane”) embedded in a 1+3+d-dimensional spacetime (the “bulk”), with Standard Model particles and fields trapped on the brane while gravity is free to access the bulk.
Roy Maartens +3 more
core +1 more source