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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Autores principales: Amati, D., Russo, J.G.
Formato: JOUR
Acceso en línea: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
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spelling todo:paper_03702693_v454_n3-4_p207_Amati2023-10-03T15:28:49Z Fundamental strings as black bodies Amati, D. Russo, J.G. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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.
format JOUR
author Amati, D.
Russo, J.G.
spellingShingle Amati, D.
Russo, J.G.
Fundamental strings as black bodies
author_facet Amati, D.
Russo, J.G.
author_sort Amati, D.
title 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
url http://hdl.handle.net/20.500.12110/paper_03702693_v454_n3-4_p207_Amati
work_keys_str_mv AT amatid fundamentalstringsasblackbodies
AT russojg fundamentalstringsasblackbodies
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