Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing object

Hawking radiation explicitly depends only on the black hole's total mass, charge and angular momentum. It is therefore generally believed that one cannot reconstruct the information about the initial mass distribution of an object that made the black hole. However, instead of looking at radiati...

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Main Authors: De-Chang Dai, Dejan Stojkovic
Format: Article
Language:English
Published: Elsevier 2016-07-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269316301848
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spelling doaj-4324194f73ea439eb9bed0f4aba605b32020-11-25T00:09:20ZengElsevierPhysics Letters B0370-26931873-24452016-07-01758C42943310.1016/j.physletb.2016.05.037Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing objectDe-Chang Dai0Dejan Stojkovic1Institute of Natural Sciences, Shanghai Key Lab for Particle Physics and Cosmology, and Center for Astrophysics and Astronomy, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, ChinaHEPCOS, Department of Physics, SUNY, University at Buffalo, Buffalo, NY 14260-1500, United StatesHawking radiation explicitly depends only on the black hole's total mass, charge and angular momentum. It is therefore generally believed that one cannot reconstruct the information about the initial mass distribution of an object that made the black hole. However, instead of looking at radiation from a static black hole, we can study the whole time-dependent process of the gravitational collapse, and pre-Hawking radiation which is excited because of the time-dependent metric. We compare radiation emitted by a single collapsing shell with that emitted by two concentric shells of the equivalent total mass. We calculate the gravitational trajectory and the momentum energy tensor. We show that the flux of energy emitted during the collapse by a single shell is significantly different from the flux emitted by two concentric shells of the equivalent total mass. When the static black hole is formed, the fluxes become indistinguishable. This implies that an observer studying the flux of particles from a collapsing object could in principle reconstruct information not only about the total mass of the collapsing object, but also about the mass distribution.http://www.sciencedirect.com/science/article/pii/S0370269316301848
collection DOAJ
language English
format Article
sources DOAJ
author De-Chang Dai
Dejan Stojkovic
spellingShingle De-Chang Dai
Dejan Stojkovic
Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing object
Physics Letters B
author_facet De-Chang Dai
Dejan Stojkovic
author_sort De-Chang Dai
title Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing object
title_short Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing object
title_full Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing object
title_fullStr Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing object
title_full_unstemmed Pre-Hawking radiation may allow for reconstruction of the mass distribution of the collapsing object
title_sort pre-hawking radiation may allow for reconstruction of the mass distribution of the collapsing object
publisher Elsevier
series Physics Letters B
issn 0370-2693
1873-2445
publishDate 2016-07-01
description Hawking radiation explicitly depends only on the black hole's total mass, charge and angular momentum. It is therefore generally believed that one cannot reconstruct the information about the initial mass distribution of an object that made the black hole. However, instead of looking at radiation from a static black hole, we can study the whole time-dependent process of the gravitational collapse, and pre-Hawking radiation which is excited because of the time-dependent metric. We compare radiation emitted by a single collapsing shell with that emitted by two concentric shells of the equivalent total mass. We calculate the gravitational trajectory and the momentum energy tensor. We show that the flux of energy emitted during the collapse by a single shell is significantly different from the flux emitted by two concentric shells of the equivalent total mass. When the static black hole is formed, the fluxes become indistinguishable. This implies that an observer studying the flux of particles from a collapsing object could in principle reconstruct information not only about the total mass of the collapsing object, but also about the mass distribution.
url http://www.sciencedirect.com/science/article/pii/S0370269316301848
work_keys_str_mv AT dechangdai prehawkingradiationmayallowforreconstructionofthemassdistributionofthecollapsingobject
AT dejanstojkovic prehawkingradiationmayallowforreconstructionofthemassdistributionofthecollapsingobject
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