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Antoniadis, I.; Benakli, K.; Ke, W.

Salvage of too slow gravitinos. (English) Zbl 1521.83193

J. High Energy Phys. 2021, No. 11, Paper No. 63, 16 p. (2021).
Summary: 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 E.W. Kolb et al. [“Catastrophic production of slow gravitinos”, Preprint, arXiv:2102.10113] 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.

Cited in 5 Documents

MSC:

83E50 Supergravity
81V15 Weak interaction in quantum theory

Keywords:

beyond standard model; cosmology; supergravity models
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References:

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