Salvage of too slow gravitinos

Abstract Gravitinos can inherit a non-relativistic dispersion relation while propagating in a background breaking both supersymmetry and Lorentz symmetry spontaneously. This is because the longitudinal mode velocity is controlled by the sound speed in the background. It was pointed out recently by K...

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Autores principales:	I. Antoniadis, K. Benakli, W. Ke
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Beyond Standard Model Cosmology of Theories beyond the SM Supergravity Models Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/0482feeccc6e45ea9d0dfa6681cf8d5f
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spelling	oai:doaj.org-article:0482feeccc6e45ea9d0dfa6681cf8d5f2021-11-14T12:40:43ZSalvage of too slow gravitinos10.1007/JHEP11(2021)0631029-8479https://doaj.org/article/0482feeccc6e45ea9d0dfa6681cf8d5f2021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)063https://doaj.org/toc/1029-8479Abstract Gravitinos can inherit a non-relativistic dispersion relation while propagating in a background breaking both supersymmetry and Lorentz symmetry spontaneously. This is because the longitudinal mode velocity is controlled by the sound speed in the background. It was pointed out recently by Kolb, Long and McDonough that the production of gravitinos might diverge when this sound speed vanishes. We argue that in the framework of cosmological models with linearly spontaneously broken realised supersymmetry, where the physical fermions are combinations of the vacuum goldstino and the inflatino, the gravitino longitudinal mode has a relativistic dispersion relation and therefore avoids the catastrophic production. We illustrate this in some explicit examples.I. AntoniadisK. BenakliW. KeSpringerOpenarticleBeyond Standard ModelCosmology of Theories beyond the SMSupergravity ModelsNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Beyond Standard Model Cosmology of Theories beyond the SM Supergravity Models Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Beyond Standard Model Cosmology of Theories beyond the SM Supergravity Models Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 I. Antoniadis K. Benakli W. Ke Salvage of too slow gravitinos
description	Abstract Gravitinos can inherit a non-relativistic dispersion relation while propagating in a background breaking both supersymmetry and Lorentz symmetry spontaneously. This is because the longitudinal mode velocity is controlled by the sound speed in the background. It was pointed out recently by Kolb, Long and McDonough that the production of gravitinos might diverge when this sound speed vanishes. We argue that in the framework of cosmological models with linearly spontaneously broken realised supersymmetry, where the physical fermions are combinations of the vacuum goldstino and the inflatino, the gravitino longitudinal mode has a relativistic dispersion relation and therefore avoids the catastrophic production. We illustrate this in some explicit examples.
format	article
author	I. Antoniadis K. Benakli W. Ke
author_facet	I. Antoniadis K. Benakli W. Ke
author_sort	I. Antoniadis
title	Salvage of too slow gravitinos
title_short	Salvage of too slow gravitinos
title_full	Salvage of too slow gravitinos
title_fullStr	Salvage of too slow gravitinos
title_full_unstemmed	Salvage of too slow gravitinos
title_sort	salvage of too slow gravitinos
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/0482feeccc6e45ea9d0dfa6681cf8d5f
work_keys_str_mv	AT iantoniadis salvageoftooslowgravitinos AT kbenakli salvageoftooslowgravitinos AT wke salvageoftooslowgravitinos
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Salvage of too slow gravitinos

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