Zobrazeno 1 - 10
of 2 442
pro vyhledávání: '"Anninos, P."'
We consider two-dimensional quantum gravity endowed with a positive cosmological constant and coupled to a conformal field theory of large and positive central charge. We study cosmological properties at the classical and quantum level. We provide a
Externí odkaz:
http://arxiv.org/abs/2406.15271
We consider the two-dimensional Schwinger model of a massless charged fermion coupled to an Abelian gauge field on a fixed de Sitter background. The theory admits an exact solution, first examined by Jayewardena, and can be analyzed efficiently using
Externí odkaz:
http://arxiv.org/abs/2403.16166
We study the static patch of de Sitter space in the presence of a timelike boundary. We impose that the conformal class of the induced metric and the trace of the extrinsic curvature, $K$, are fixed at the boundary. We present the thermodynamic struc
Externí odkaz:
http://arxiv.org/abs/2402.04305
Publikováno v:
Physics of the Dark Universe Volume 44, May 2024, 101480
Through the Gertsenshtein effect, the presence of a large external B-field may allow photons and gravitons to mix in a way that resembles neutrino oscillations and is even more similar to axion-photon mixing. Assuming a background B-field (or any fie
Externí odkaz:
http://arxiv.org/abs/2401.08346
Publikováno v:
Phys.Rev. D52 (1995) 2044-2058
We study the head-on collision of two equal mass, nonrotating black holes. Various initial configurations are investigated, including holes which are initially surrounded by a common apparent horizon to holes that are separated by about $20M$, where
Externí odkaz:
http://arxiv.org/abs/gr-qc/9408041
We present a set of six general relativistic, multi-frequency, radiation magnetohydrodynamic simulations of thin accretion disks with different target mass accretion rates around black holes with spins ranging from non-rotating to rapidly spinning. T
Externí odkaz:
http://arxiv.org/abs/2311.00028
We consider four-dimensional general relativity with vanishing cosmological constant defined on a manifold with a boundary. In Lorentzian signature, the timelike boundary is of the form $\boldsymbol{\sigma} \times \mathbb{R}$, with $\boldsymbol{\sigm
Externí odkaz:
http://arxiv.org/abs/2310.08648
We construct two-dimensional supergravity theories endowed with a positive cosmological constant, that admit de Sitter vacua. We consider the cases of $\mathcal{N}=1$ as well as $\mathcal{N}=2$ supersymmetry, and couple the supergravity to a supercon
Externí odkaz:
http://arxiv.org/abs/2309.02480
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 8, Pp 1-50 (2024)
Abstract We consider the two-dimensional Schwinger model of a massless charged fermion coupled to an Abelian gauge field on a fixed de Sitter background. The theory admits an exact solution, first examined by Jayewardena, and can be analyzed efficien
Externí odkaz:
https://doaj.org/article/5ad373e8a4b64940ab8bfa365438b3ff
We study quantum field theories placed on a two-dimensional de Sitter spacetime (dS$_2$) with an eye on the group-theoretic organisation of single and multi-particle states. We explore the distinguished role of the discrete series unitary irreducible
Externí odkaz:
http://arxiv.org/abs/2307.15832