Fundamental strings as black bodies

We show that the decay spectrum of massive excitations in perturbative string theories is thermal when averaged over the (many) initial degenerate states. We first compute the inclusive photon spectrum for open strings at the tree level showing that a black body spectrum with the Hagedorn temperatur...

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Publicado: 1999
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v454_n3-4_p207_Amati
http://hdl.handle.net/20.500.12110/paper_03702693_v454_n3-4_p207_Amati
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03702693_v454_n3-4_p207_Amati
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spelling paper:paper_03702693_v454_n3-4_p207_Amati2023-06-08T15:36:37Z Fundamental strings as black bodies We show that the decay spectrum of massive excitations in perturbative string theories is thermal when averaged over the (many) initial degenerate states. We first compute the inclusive photon spectrum for open strings at the tree level showing that a black body spectrum with the Hagedorn temperature emerges in the averaging. A similar calculation for a massive closed string state with winding and Kaluza-Klein charges shows that the emitted graviton spectrum is thermal with a "grey-body" factor, which approaches one near extremality. These results uncover a simple physical meaning of the Hagedorn temperature and provide an explicit microscopic derivation of the black body spectrum from a unitary S matrix. © 1999 Elsevier Science B.V. All rights reserved. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v454_n3-4_p207_Amati http://hdl.handle.net/20.500.12110/paper_03702693_v454_n3-4_p207_Amati
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We show that the decay spectrum of massive excitations in perturbative string theories is thermal when averaged over the (many) initial degenerate states. We first compute the inclusive photon spectrum for open strings at the tree level showing that a black body spectrum with the Hagedorn temperature emerges in the averaging. A similar calculation for a massive closed string state with winding and Kaluza-Klein charges shows that the emitted graviton spectrum is thermal with a "grey-body" factor, which approaches one near extremality. These results uncover a simple physical meaning of the Hagedorn temperature and provide an explicit microscopic derivation of the black body spectrum from a unitary S matrix. © 1999 Elsevier Science B.V. All rights reserved.
title Fundamental strings as black bodies
spellingShingle Fundamental strings as black bodies
title_short Fundamental strings as black bodies
title_full Fundamental strings as black bodies
title_fullStr Fundamental strings as black bodies
title_full_unstemmed Fundamental strings as black bodies
title_sort fundamental strings as black bodies
publishDate 1999
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v454_n3-4_p207_Amati
http://hdl.handle.net/20.500.12110/paper_03702693_v454_n3-4_p207_Amati
_version_ 1768541755092762624

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