Results 11 to 20 of about 79,313 (303)
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
doaj +3 more sources
Viscosity in Modified Gravity [PDF]
Entropy, 2012 A bulk viscosity is introduced in the formalism of modified gravity. It is shownthat, based on a natural scaling law for the viscosity, a simple solution can be found forquantities such as the Hubble parameter and the energy density. These solutions mayincorporate a viscosity-induced Big Rip singularity.
I Brevik, Brevik Iver
exaly +5 more sources
Limited modified gravity [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 We systematically assess several limiting cases of modified gravity, where particular theoretical or observational conditions hold. This framework includes the well known scalar-tensor gravity and No Slip Gravity and No Run Gravity, and we extend it to three new limits: Only Run, Only Light, and Only Growth Gravities.
Linder, Eric V
openaire +6 more sources
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
doaj +2 more sources
Modified gravity and cosmology
Physics Reports, 2012 In this review we present a thoroughly comprehensive survey of recent work on modified theories of gravity and their cosmological consequences. Amongst other things, we cover General Relativity, Scalar-Tensor, Einstein-Aether, and Bimetric theories, as well as TeVeS, f(R), general higher-order theories, Horava-Lifschitz gravity, Galileons, Ghost ...
Timothy Clifton +2 more
exaly +6 more sources
Causal hierarchy in modified gravity [PDF]
Journal of High Energy Physics, 2020 We investigate the causal hierarchy in various modified theories of gravity. In general relativity the standard causal hierarchy, (key elements of which are chronology, causality, strong causality, stable causality, and global hyperbolicity), is well ...
Raúl Carballo-Rubio +3 more
doaj +2 more sources
New classes of modified teleparallel gravity models
Physics Letters B, 2017 New classes of modified teleparallel theories of gravity are introduced. The action of this theory is constructed to be a function of the irreducible parts of torsion f(Tax,Tten,Tvec), where Tax,Tten and Tvec are squares of the axial, tensor and vector ...
Sebastian Bahamonde +2 more
doaj +3 more sources
Modified Gravity as Entropic Cosmology
UniverseThe present work reveals a direct correspondence between modified theories of gravity (cosmology) and entropic cosmology based on the thermodynamics of apparent horizon.
Shin’ichi Nojiri +3 more
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Cosmological hints of modified gravity?
Physical Review D, 2016 The recent measurements of Cosmic Microwave Background temperature and polarization anisotropies made by the Planck satellite have provided impressive confirmation of the $Λ$CDM cosmological model. However interesting hints of slight deviations from $Λ$CDM have been found, including a $95 \%$ c.l. preference for a "modified gravity" structure formation
DI VALENTINO, ELEONORA +2 more
openaire +5 more sources
Dynamical masses in modified gravity [PDF]
Physical Review D, 2010 18 pages, 16 figures; submitted to PRD; v2: typos corrected, references added, minor additions (Sec. IID)
Schmidt, Fabian
openaire +4 more sources