On causality violation on a Kerr-de Sitter spacetime
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DOI: 10.1007/s10714-018-2456-3
Abstract: The causal properties of the family of Kerr-de Sitter spacetimes are analyzed and compared to those of the Kerr family. First, an inextendible Kerr-de Sitter spacetime is obtained by joining together Carter’s blocks, i.e. suitable… read more here.
Keywords: causal; kerr sitter; sitter; sitter spacetime ... See more keywords
The Kerr–Newman–(anti-)de Sitter spacetime: Extremal configurations and electrogeodesics
Sign Up to like & getrecommendations! Published in 2019 at "General Relativity and Gravitation"
DOI: 10.1007/s10714-019-2639-6
Abstract: We study motion of charged test particles, or electrogeodesics, in the Kerr–Newman–(anti-)de Sitter spacetime. We focus on the equatorial plane and the axis of symmetry where the analysis is considerably simpler. The electric charge opens… read more here.
Keywords: electrogeodesics kerr; kerr newman; sitter spacetime; anti sitter ... See more keywords
The fermionic signature operator in de Sitter spacetime
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Mathematical Analysis and Applications"
DOI: 10.1016/j.jmaa.2019.123808
Abstract: The fermionic projector state is a distinguished quasi-free state for the algebra of Dirac fields in a globally hyperbolic spacetime. We construct and analyze it in the four-dimensional de Sitter spacetime, both in the closed… read more here.
Keywords: sitter spacetime; signature operator; state; fermionic signature ... See more keywords
Stability of traveling wave for the relativistic string equation in de Sitter spacetime
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DOI: 10.1063/1.5116382
Abstract: In this paper, we are concerned with the relativistic string equations in de Sitter spacetime. Since the background spacetime is nonflat, the governing system of equations is semilinear under the usual isothermal coordinates, contrary to… read more here.
Keywords: relativistic string; sitter spacetime; stability traveling; traveling wave ... See more keywords
The Kerr–de Sitter spacetime in Bondi coordinates
Sign Up to like & getrecommendations! Published in 2021 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ac2c1f
Abstract: We use zero angular momentum null geodesics in the Kerr–de Sitter spacetime to transform the metric in a generalised Bondi coordinate system. We write the metric components explicitly. Next, we choose the radial coordinate to… read more here.
Keywords: kerr sitter; spacetime bondi; sitter spacetime; bondi ... See more keywords
On the non-linear stability of the Cosmological region of the Schwarzschild-de Sitter spacetime
Sign Up to like & getrecommendations! Published in 2023 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/acdb3f
Abstract: The non-linear stability of the sub-extremal Schwarzschild-de Sitter spacetime in the stationary region near the conformal boundary is analysed using a technique based on the extended conformal Einstein field equations and a conformal Gaussian gauge.… read more here.
Keywords: spacetime; region; schwarzschild sitter; stability ... See more keywords
Fermionic Bell violation in the presence of background electromagnetic fields in the cosmological de Sitter spacetime
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DOI: 10.1103/physrevd.104.125012
Abstract: The violation of the Bell inequality for Dirac fermions is investigated in the cosmological de Sitter spacetime, in the presence of background electromagnetic fields of constant strengths. The orthonormal Dirac mode functions are obtained and… read more here.
Keywords: bell; presence background; cosmological sitter; violation ... See more keywords
Vacuum state in de Sitter spacetime with static charts
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DOI: 10.1103/physrevd.98.065014
Abstract: We study the free massive scalar field in de Sitter spacetime with static charts. In particular, we find positive-frequency modes for the Bunch-Davies vacuum state natural to the static charts as superpositions of the well-known… read more here.
Keywords: state; static charts; sitter spacetime; vacuum state ... See more keywords
Late-time quantum radiation by a uniformly accelerated detector in de Sitter spacetime
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.105012
Abstract: We investigate the quantum radiation emitted by a uniformly accelerated Unruh-DeWitt detector in de Sitter spacetime. We find that there exists a non-vanishing quantum radiation at late times in the radiation zone of the conformally… read more here.
Keywords: quantum; sitter spacetime; quantum radiation;
Quantum correlators in Friedmann spacetimes: The omnipresent de Sitter spacetime and the invariant vacuum noise
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.105015
Abstract: We discuss several aspects of quantum field theory of a scalar field in a Friedmann universe, clarifying and highlighting several conceptual and technical issues. (A) We show that one can map the dynamics of (1)… read more here.
Keywords: field; vacuum; scalar field; sitter spacetime ... See more keywords
Thermodynamics of bosonic systems in anti–de Sitter spacetime
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.99.084028
Abstract: We analyze the Thermodynamics of massless bosonic systems in D-dimensional anti-de Sitter (adS) spacetime, considering scalar, electromagnetic and gravitational fields. The dynamics of the several fields of interest are described by P\"{o}schl-Teller effective potentials. The… read more here.
Keywords: thermodynamics bosonic; systems anti; anti sitter; sitter spacetime ... See more keywords