Cherenkov Gravitational Radiation during the Radiation Era

Cherenkov radiation may occur whenever the source is moving faster than the waves it generates. In a radiation dominated universe, with equation-of-state <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><...

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Autores principales:	Yi-Zen Chu, Yen-Wei Liu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	gravitational waves cosmology Cherenkov radiation Elementary particle physics QC793-793.5
Acceso en línea:	https://doaj.org/article/d1c753910d48403080d4a143963824c6
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spelling	oai:doaj.org-article:d1c753910d48403080d4a143963824c62021-11-25T19:09:47ZCherenkov Gravitational Radiation during the Radiation Era10.3390/universe71104372218-1997https://doaj.org/article/d1c753910d48403080d4a143963824c62021-11-01T00:00:00Zhttps://www.mdpi.com/2218-1997/7/11/437https://doaj.org/toc/2218-1997Cherenkov radiation may occur whenever the source is moving faster than the waves it generates. In a radiation dominated universe, with equation-of-state <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>w</mi><mo>=</mo><mn>1</mn><mo>/</mo><mn>3</mn></mrow></semantics></math></inline-formula>, we have recently shown that the Bardeen scalar-metric perturbations contribute to the linearized Weyl tensor in such a manner that its wavefront propagates at acoustic speed <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msqrt><mi>w</mi></msqrt><mo>=</mo><mn>1</mn><mo>/</mo><msqrt><mn>3</mn></msqrt></mrow></semantics></math></inline-formula>. In this work, we explicitly compute the shape of the Bardeen Cherenkov cone and wedge generated respectively by a supersonic point mass (approximating a primordial black hole) and a straight Nambu-Goto wire (approximating a cosmic string) moving perpendicular to its length. When the black hole or cosmic string is moving at ultra-relativistic speeds, we also calculate explicitly the sudden surge of scalar-metric induced tidal forces on a pair of test particles due to the passing Cherenkov shock wave. These forces can stretch or compress, depending on the orientation of the masses relative to the shock front’s normal.Yi-Zen ChuYen-Wei LiuMDPI AGarticlegravitational wavescosmologyCherenkov radiationElementary particle physicsQC793-793.5ENUniverse, Vol 7, Iss 437, p 437 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	gravitational waves cosmology Cherenkov radiation Elementary particle physics QC793-793.5
spellingShingle	gravitational waves cosmology Cherenkov radiation Elementary particle physics QC793-793.5 Yi-Zen Chu Yen-Wei Liu Cherenkov Gravitational Radiation during the Radiation Era
description	Cherenkov radiation may occur whenever the source is moving faster than the waves it generates. In a radiation dominated universe, with equation-of-state <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>w</mi><mo>=</mo><mn>1</mn><mo>/</mo><mn>3</mn></mrow></semantics></math></inline-formula>, we have recently shown that the Bardeen scalar-metric perturbations contribute to the linearized Weyl tensor in such a manner that its wavefront propagates at acoustic speed <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msqrt><mi>w</mi></msqrt><mo>=</mo><mn>1</mn><mo>/</mo><msqrt><mn>3</mn></msqrt></mrow></semantics></math></inline-formula>. In this work, we explicitly compute the shape of the Bardeen Cherenkov cone and wedge generated respectively by a supersonic point mass (approximating a primordial black hole) and a straight Nambu-Goto wire (approximating a cosmic string) moving perpendicular to its length. When the black hole or cosmic string is moving at ultra-relativistic speeds, we also calculate explicitly the sudden surge of scalar-metric induced tidal forces on a pair of test particles due to the passing Cherenkov shock wave. These forces can stretch or compress, depending on the orientation of the masses relative to the shock front’s normal.
format	article
author	Yi-Zen Chu Yen-Wei Liu
author_facet	Yi-Zen Chu Yen-Wei Liu
author_sort	Yi-Zen Chu
title	Cherenkov Gravitational Radiation during the Radiation Era
title_short	Cherenkov Gravitational Radiation during the Radiation Era
title_full	Cherenkov Gravitational Radiation during the Radiation Era
title_fullStr	Cherenkov Gravitational Radiation during the Radiation Era
title_full_unstemmed	Cherenkov Gravitational Radiation during the Radiation Era
title_sort	cherenkov gravitational radiation during the radiation era
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d1c753910d48403080d4a143963824c6
work_keys_str_mv	AT yizenchu cherenkovgravitationalradiationduringtheradiationera AT yenweiliu cherenkovgravitationalradiationduringtheradiationera
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Cherenkov Gravitational Radiation during the Radiation Era

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