“Quantum Gravity” Science-Research, December 2021 — summary from Astrophysics Data System

Astrophysics Data System — summary generated by Brevi Assistant

Lorentz invariance violation in quantum gravity models or a nonzero photon mass, m γ, would lead to an energy-dependent propagation rate for photons, such that photons of different powers from a distant source would reach various times, even if they were emitted all at once. The QG restriction is amongst the tightest from studies which consider multiple gamma ray bursts and the restriction on m γ, although weak than from using radio data, gives an independent restraint which is less sensitive to the results of dispersion by electrons. The quasi-local concept of an isolated perspective is employed to research the worsening of black holes with no specific symmetry in loop quantum gravity. Further proof reveals that, for an offered horizon location, the degeneration reduces as a black hole differs the spherically symmetric one, and the entropy formula is ideal for big black holes. It is widely known that deep space is opaque to the proliferation of Ultra-High-Energy Cosmic Rays since these fragments dissipate energy during their proliferation connecting with the Cosmic Microwave Background mainly in the supposed GZK cut-off sensation. This spacetime description calls for a more basic geometry than the normal Riemannian one, suggesting as an example the Finsler construction and the related generalised Finsler spacetime as perfect candidates. By taking the restriction that Newton’s Gravitational constant has a tendency to no, the weak combining loop quantum gravity can be developed as a U³ scale concept rather than the initial SU scale concept. It is shown that the effective characteristics gotten from the systematic state path integrals in U³ and SU loop quantum gravity respectively correspond to every other in the weak coupling limit, given that the assumption values of the Hamiltonian operators on the coherent states in these 2 concepts correspond with their classic expressions respectively.

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