Results 51 to 60 of about 2,562 (178)

Tests of standard cosmology in Hořava gravity, Bayesian evidence for a closed universe, and the Hubble tension

European Physical Journal C: Particles and Fields, 2022
We consider some background tests of standard cosmology in the context of Hořava gravity with different scaling dimensions for space and time, which has been proposed as a renormalizable, higher-derivative, Lorentz-violating quantum gravity model without
Nils A. Nilsson, Mu-In Park
doaj   +1 more source

Group Field Theory and Its Cosmology in a Matter Reference Frame

Universe, 2018
While the equations of general relativity take the same form in any coordinate system, choosing a suitable set of coordinates is essential in any practical application.
Steffen Gielen
doaj   +1 more source

Non-metricity signatures on the Higgs boson signal strengths at the LHC

Journal of High Energy Physics, 2022
In this work we study the high-energy Higgs boson phenomenology associated to the non-metricity scale Λ Q at the LHC. Non-metricity is present in more generic non-Riemannian geometries describing gravity beyond General Relativity and exhibits nice ...
Victor Ilisie
doaj   +1 more source

Non-commutative classical and quantum fractionary cosmology: anisotropic Bianchi type I case [PDF]

General Relativity and Gravitation
In this work, we explore non-commutative effects in fractional classical and quantum schemes using the anisotropic Bianchi type I cosmological model coupled to a scalar field in the K-essence formalism.
J. Socorro, ·. J. J. Rosales, Leonel Toledo Sesma, J. J. Rosales, Leonel Toledo   +4 more
semanticscholar   +1 more source

Effective actions for loop quantum cosmology in fourth-order gravity

European Physical Journal C: Particles and Fields, 2021
Loop quantum cosmology (LQC) is a theory which renders the Big Bang initial singularity into a quantum bounce, by means of short-range repulsive quantum effects at the Planck scale.
Marcello Miranda, Daniele Vernieri, Salvatore Capozziello, Francisco S. N. Lobo   +3 more
doaj   +1 more source

Generalized Rest Mass and Dirac’s Monopole in 5D Theory and Cosmology

Universe, 2021
It is shown that the 5D geodetic equations and 5D Ricci identities give us a way to create a new viewpoint on some problems of modern physics, astrophysics, and cosmology.
Boris G. Aliyev
doaj   +1 more source

Space Convergence Theory: Space Converging as a Standing Wave Model Unifying General Relativity, Quantum Mechanics, and Cosmology

Satish Bhaurao Thorwe
openalex   +2 more sources

General relativity and cosmology [PDF]

, 2015
This year marks the hundredth anniversary of Einstein's 1915 landmark paper "Die Feldgleichungen der Gravitation" in which the field equations of general relativity were correctly formulated for the first time, thus rendering general relativity a ...
M. Bucher, W. Ni
semanticscholar   +1 more source

Aspects of Quantum Theory in General Relativity and Cosmology

, 2020
After a brief introduction to Cosmology some quantum aspects of General Relativity and cosmology are presented. The radial motion of a massive particles in the ergosphere of the Kerr Black Hole is considered. Screening of Hawking radiation and shielding of the Penrose process is examined in the context of the region of negative energy inside the ...
openaire   +2 more sources

Shedding light on gravity: Black hole shadows and lensing signatures in Lorentz gauge theory

Nuclear Physics B
Recent advances, including gravitational wave detections and imaging of black hole shadows, have strongly validated general relativity. Nevertheless, ongoing cosmological observations suggest potential limitations of general relativity, spurring interest
Ali Övgün, Mohsen Fathi
doaj   +1 more source