Results 31 to 40 of about 3,111,277 (372)
Hunting for extra dimensions in the shadow of M87* [PDF]
Physical Review D, 2019 The Event Horizon Telescope has recently provided the first image of the dark shadow around the supermassive black hole M87*. The observation of a highly circular shadow provides strong limits on deviations of M87*'s quadrupole moment from the Kerr value.
S. Vagnozzi, L. Visinelli
semanticscholar +1 more source
Local Regions with Expanding Extra Dimensions
Physics, 2021 In this paper possible spatial domains, containing expanding extra dimensions, are studied. It is demonstrated that these domains are predicted in the framework of f(R) gravity (where R is the scalar curviture) and could appear due to quantum ...
Kirill A. Bronnikov, Sergey G. Rubin
doaj +1 more source
Gravitational Waves and Extra Dimensions: A Short Review [PDF]
Communications in Theoretical Physics, 2019 We give a brief review on the recent development of gravitational waves in extra-dimensional theories of gravity. Studying extra-dimensional theories with gravitational waves provides a new way to constrain extra dimensions.
Hao-Ran Yu, Zi-Chao Lin, Yu-Xiao Liu
semanticscholar +1 more source
Decoding signatures of extra dimensions and estimating spin of quasars from the continuum spectrum [PDF]
Physical Review D, 2019 Continuum spectrum emitted by the accretion disk around quasars hold a wealth of information regarding the strong gravitational field produced by the massive central object.
Indrani Banerjee +2 more
semanticscholar +1 more source
Constraints and horizons for de Sitter with extra dimensions [PDF]
Physical Review D, 2019 In order for spacetimes with static extra dimensions to have 4-dimensional de Sitter expansion they must have at least positive curvature, warping sourced by the 4-d expansion, or violate the null energy condition everywhere in the extra dimensions.
Saurya Das, S. S. Haque, Bret Underwood
semanticscholar +1 more source
Exponentially large extra dimensions [PDF]
Physical Review D, 2002 We show how the presence of a very light scalar with a cubic self-interaction in six dimensions can stabilize the extra dimensions at radii which are naturally exponentially large, $r \sim \ell \exp [(4 )^3/g^2]$, where $\ell$ is a microscopic physics scale and $g$ is the (dimensionless) cubic coupling constant. The resulting radion mode of the metric
Albrecht, A. +3 more
openaire +2 more sources
Warped universal extra dimensions [PDF]
Journal of High Energy Physics, 2011 We consider a 5D warped scenario with a KK-parity symmetry, where the non-trivial warping arises from the dynamics that stabilizes the size of the extra dimension. Generically, the lightest Kaluza-Klein (KK) particle is the first excitation of the radion field, while the next-to-lightest Kaluza-Klein particle is either the first excitation of the (RH ...
Medina, Aníbal D., Pontón, Eduardo
openaire +3 more sources
Signatures of extra dimensions in gravitational waves from black hole quasinormal modes [PDF]
Physical Review D, 2017 In this work we have derived the evolution equation for gravitational perturbation in four dimensional spacetime in presence of a spatial extra dimension.
S. Chakraborty +3 more
semanticscholar +1 more source
Brane-world extra dimensions in light of GW170817 [PDF]
, 2017 The search for extra dimensions is a challenging endeavor to probe physics beyond the Standard Model.
L. Visinelli, Nadia Bolis, S. Vagnozzi
semanticscholar +1 more source
Signatures of extra dimensions in gravitational waves [PDF]
, 2017 Considering gravitational waves propagating on the most general 4+N-dimensional space-time, we investigate the effects due to the N extra dimensions on the four-dimensional waves. All wave equations are derived in general and discussed.
D. Andriot, Gustavo Lucena G'omez
semanticscholar +1 more source