Results 41 to 50 of about 1,952,488 (304)
Chaos in a Magnetized Modified Gravity Schwarzschild Spacetime
Universe, 2022 Based on the scalar–tensor–vector modified gravitational theory, a modified gravity Schwarzschild black hole solution has been given in the existing literature.
Daqi Yang +5 more
doaj +1 more source
Cosmological tests of modified gravity [PDF]
Reports on Progress in Physics, 2016 82 pages, 28 figures. This review is partly based on arXiv:1304.0601, arXiv:1305.0279 and arXiv:1503.06673.
openaire +5 more sources
Swampland and screened modified gravity [PDF]
Physical Review D, 2020 We consider the implications of the swampland conjectures on scalar-tensor theories defined in the Einstein frame in which the scalar interaction is screened. We show that chameleon models are not in the swampland provided the coupling to matter is larger than unity and the mass of the scalar field is much larger than the Hubble rate.
Brax, P., van de Bruck, C., Davis, A.-C.
openaire +4 more sources
Cosmological bound from the neutron star merger GW170817 in scalar–tensor and F(R) gravity theories
Physics Letters B, 2018 We consider the evolution of cosmological gravitational waves in scalar–tensor theory and F(R) gravity theory as typical models of the modified gravity. Although the propagation speed is not changed from the speed of light, the propagation phase changes ...
Shin'ichi Nojiri, Sergei D. Odintsov
doaj +1 more source
Charged gravastars in modified gravity [PDF]
Physical Review D, 2019 In this paper, we investigate the effects of electromagnetic field on the isotropic spherical gravastar models in metric $f(R,T)$ gravity. For this purpose, we have explored singularity-free exact models of relativistic spheres with a specific equation of state.
Yousaf, Z. +3 more
openaire +2 more sources
Maxwell-modified metric affine gravity
European Physical Journal C: Particles and Fields, 2021 We present a gauge formulation of the special affine algebra extended to include an antisymmetric tensorial generator belonging to the tensor representation of the special linear group.
Oktay Cebecioğlu, Salih Kibaroğlu
doaj +1 more source
Matter Instability in Theories with Modified Induced Gravity
Advances in High Energy Physics, 2012 Matter stability is a necessary condition to have a cosmologically viable model. Modified gravity in the spirit of f(R) theories suffers from matter instability in some subdomains of the model parameter space.
Kourosh Nozari, Faeze Kiani
doaj +1 more source
Causal hierarchy in modified gravity
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 +1 more source
Generalized gravity from modified DFT
Journal of High Energy Physics, 2017 Recently, generalized equations of type IIB supergravity have been derived from the requirement of classical kappa-symmetry of type IIB superstring theory in the Green-Schwarz formulation.
Yuho Sakatani +2 more
doaj +1 more source