Results 81 to 90 of about 51,631 (191)

Axion Black Hole Solution in Non‐Metricity Gravity

Fortschritte der Physik, Volume 74, Issue 2, February 2026.
Abstract A static, spherically symmetric black hole solution in symmetric teleparallel (non‐metricity) gravity sourced by an axion field is constructed. Starting from the modified field equations, exact configurations are obtained characterized by the mass M$M$ and an axion–geometry coupling β$\beta$, with temporal metric function A(r)=1−2Mr+βr$A(r)=1-\
A. Eid, G.G.L. Nashed
wiley   +1 more source

Coordinate‐ and Spacetime‐Independent Quantum Physics

Annalen der Physik, Volume 538, Issue 1, January 2026.
This article studies in the framework of quantum field theory in curved spacetime, if there exists a single zero‐rank‐tensor solution of a Klein‐Gordon PDE, being valid at once for the depicted spacetimes. The answer is shown to be affirmative, even for a class of such solutions having the standard applications in particle physics. ABSTRACT The concept
Viacheslav A. Emelyanov, Daniel Robertz
wiley   +1 more source

Unitary evolution and cosmic acceleration in Loop Quantum Cosmology

Physics Letters B
Loop quantum cosmology was shown to interpolate between de Sitter and FLRW Universe phases through a bounce by including Euclidean and Lorentzian terms of the Hamiltonian constraint with weight one -that corresponding to classical General Relativity ...
Omar Gallegos, Tonatiuh Matos, Hugo A. Morales-Técotl   +2 more
doaj   +1 more source

Particle pair creation by inflation of quantum vacuum fluctuations in an ion trap

, 2019
The creation of matter and structure in our universe is currently described by an intricate interplay of quantum field theory and general relativity.
Fey, Christian, Hakelberg, Frederick, Kiefer, Philip, Schaetz, Tobias, Schröder, Jan-Philipp, Schützhold, Ralf, Warring, Ulrich, Wittemer, Matthias   +7 more
core   +1 more source

Quantum GraviElectro Dynamics

Annalen der Physik, Volume 538, Issue 1, January 2026.
The BRST invariant Lagrangian of the gravitationally interacting U(1)$U(1)$ gauge theory, namely the Quantum GraviElectro Dynamics (QGED). The Yan–Mills theory with the Hilbert–Einstein gravitational Lagrangian, namely the Yang–Mills–Utiyama (YMU) theory, is defined and quantised using the standard procedure. The theory is perturbatively renormalisable,
Yoshimasa Kurihara
wiley   +1 more source

Bogolyubov Quasiparticles in Constrained Systems

, 1999
The paper is devoted to the formulation of quantum field theory for an early universe in General Relativity considered as the Dirac general constrained system.
Bogoliubov N N, Chernikov N A, Dirac P A M, Dirac P A M, Faddeev L D, Grib A A, Gyngazov L N, Henneaux M, Hoyle F, Kodama H, Kuchar K, Lichnerowicz A, Maxwell J C, Narlikar J V, Penrose R, Pervushin V N, Pervushin V N, Review of particle physics Olive K A, V I Smirichinski, V N Pervushin, Vladimirov Yu S, Weyl H, Zel'dovich Ya B, Zelmanov A L, Zelmanov A L   +24 more
core   +2 more sources

Matematyka i kosmologia

Zagadnienia Filozoficzne w Nauce, 2012
The mathematical and cosmological works of a group associated with the Copernicus Center for Interdisciplinary Studies in Cracow are summarized. The group consists mainly of M. Heller, L. Pysiak, W. Sasin, Z. Odrzygóźdź and J. Gruszczak.
Michał Heller
doaj  

Complex degenerate metrics in general relativity: a covariant extension of the Moore–Penrose algorithm

European Physical Journal C: Particles and Fields
The Moore–Penrose algorithm provides a generalized notion of an inverse, applicable to degenerate matrices. In this paper, we introduce a covariant extension of the Moore–Penrose method that permits to deal with general relativity involving complex non ...
Arthur Garnier, Emmanuele Battista
doaj   +1 more source

Degenerate Configurations, Singularities and the Non-Abelian Nature of Loop Quantum Gravity

, 2006
Degenerate geometrical configurations in quantum gravity are important to understand if the fate of classical singularities is to be revealed. However, not all degenerate configurations arise on an equal footing, and one must take into account dynamical ...
Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A Bojowald M Willis J, Banerjee K, Berger B, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M, Bojowald M Hernández H H H Morales-Técotl H A, Bojowald M Morales-Técotl H A, Bojowald M Swiderski R, Brunnemann J, Brunnemann J Thiemann T, Brunnemann J Thiemann T, Brunnemann J Thiemann T, Giesel K Thiemann T, Husain V, Immirzi G, Martin Bojowald, Modesto L, Neville D E, Sahlmann H Thiemann T, Thiemann T, Thiemann T, Willis J   +39 more
core   +1 more source

An open system approach to gravity

Journal of High Energy Physics
Several major open problems in cosmology — including the nature of inflation, dark matter, and dark energy — share a common structure: they involve spacetime-filling media with unknown microphysics, and can be probed so far only through their ...
Santiago Agüí Salcedo, Thomas Colas, Lennard Dufner, Enrico Pajer   +3 more
doaj   +1 more source