Results 41 to 50 of about 51,813 (205)
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 BRecent 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
European Physical Journal C: Particles and Fields, 2018 Bouncing cosmologies are obtained by adding to the Einstein–Hilbert action a term of the form $$\sqrt{-\,g}f(\chi )$$ -gf(χ) , with $$\chi $$ χ a scalar depending on the Hubble parameter only, not on its derivatives, and which is here shown to arise from
Jaume de Haro +2 more
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
Simple quantum cosmology: Vacuum energy and initial state
, 2005 A static non-singular 10-dimensional closed Friedmann universe of Planck size, filled with a perfect fluid with an equation of state with w = -2/3, can arise spontaneously by a quantum fluctuation from nothing in 11-dimensional spacetime.
D. Spergel +8 more
core +2 more sources
Aspects of Cosmic Inflation in Expanding Bose-Einstein Condensates [PDF]
, 2005 Phonons in expanding Bose-Einstein condensates with wavelengths much larger than the healing length behave in the same way as quantum fields within a universe undergoing an accelerated expansion. This analogy facilitates the application of many tools and
Abramowitz M +16 more
core +1 more source
Making Classical and Quantum Canonical General Relativity Computable through a Power Series Expansion in the Inverse Cosmological Constant [PDF]
Physical Review Letters, 2000 5 pages, RevTeX with multicol and ...
Gambini, Rodolfo, Pullin, Jorge
openaire +3 more sources
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
, 2015 Loop quantum cosmology tries to capture the main ideas of loop quantum gravity and to apply them to the Universe as a whole. Two main approaches within this framework have been considered to date for the study of cosmological perturbations: the dressed ...
Barrau, A. +4 more
core +3 more sources
Physics Letters B, 2022 Parity violating models based on the symmetric teleparallel gravity have been considered in the literature, but their applications in cosmology and especially the features in cosmological perturbations have not been fully explored.
Mingzhe Li, Dehao Zhao
doaj +1 more source