Semiclassical environment of collapsing shells - General Relativity and Quantum CosmologyReport as inadecuate




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Abstract: We explore in detail the semiclassical environment of collapsing shells ofmatter, and determine the semiclassical flux measured by a variety ofobservers. This study is a preliminary step in a broader investigation ofthermodynamic properties of the geometry of collapsing objects. Specifically,in this paper we consider spherically symmetric null and timelike collapsingshells which form an event horizon, and calculate the flux measured byobservers both inside and outside the shell, and both inside and outside theevent horizon, and find nontrivial results in most of the cases. Additionally,we also investigate the environment of a shell which collapses but \emph{doesnot} form a horizon, halting at some radius larger than the Schwarzschildradius, and find that such an object generically gives rise to a pulse ofradiation which is sharply peaked as it travels inwards and is reflected at theorigin, and eventually emerges from the shell in a -thermalized- form. Ourresults have potential consequences in addressing questions pertaining, e.g. toblack hole entropy and backreaction.



Author: Kinjal Banerjee, Aseem Paranjape

Source: https://arxiv.org/







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