Salvage of too slow gravitinos

Autor: Karim Benakli, Ignatios Antoniadis, Wenqi Ke
Přispěvatelé: Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2021
Předmět:
High Energy Physics - Theory
cosmological model
Nuclear and High Energy Physics
dispersion relation
Spontaneous symmetry breaking
background: Robertson-Walker
FOS: Physical sciences
QC770-798
multiplet: chiral
01 natural sciences
Longitudinal mode
General Relativity and Quantum Cosmology
Theoretical physics
High Energy Physics - Phenomenology (hep-ph)
Nuclear and particle physics. Atomic energy. Radioactivity
Speed of sound
Dispersion relation
0103 physical sciences
Goldstino
010306 general physics
Physics
[PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th]
010308 nuclear & particles physics
High Energy Physics::Phenomenology
spontaneous symmetry breaking
Fermion
Supersymmetry
Cosmology of Theories beyond the SM
violation: Lorentz
velocity: acoustic
High Energy Physics - Phenomenology
High Energy Physics - Theory (hep-th)
gravitino: production
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Beyond Standard Model
Gravitino
supersymmetry
Supergravity Models
Zdroj: Journal of High Energy Physics, Vol 2021, Iss 11, Pp 1-16 (2021)
Journal of High Energy Physics
JHEP
JHEP, 2021, 11, pp.063. ⟨10.1007/JHEP11(2021)063⟩
ISSN: 1029-8479
Popis: 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.
16 pages. This v2 matches the published version: one reference added and minor changes in the introduction
Databáze: OpenAIRE
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