Gravity waves and gravitino dark matter in mu-hybrid inflation

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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract

We propose a novel reformulation of supersymmetric (more precisely μ-) hybrid inflation based on a local U(1) or any suitable extension of the minimal supersymmetric standard model (MSSM) which also resolves the μ problem. We employ a suitable Kahler potential which effectively yields quartic inflation with non-minimal coupling to gravity. Imposing the gravitino Big Bang Nucleosynthesis (BBN) constraint on the reheat temperature (({T}_{r}\lesssim {10}^{6}) GeV) and requiring a neutralino LSP, the tensor to scalar ratio (r) has a lower bound (r\gtrsim 0.004). The U(1) symmetry breaking scale lies between 10(^{8}) and 10(^{12}) GeV. We also discuss a scenario with gravitino dark matter whose mass is a few GeV.

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Keywords
SUPERGRAVITY, UNIVERSE, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics
Citation
Okada, N., & Shafi, Q. (2018). Gravity waves and gravitino dark matter in μ-hybrid inflation. In Physics Letters B (Vol. 787, pp. 141–145). Elsevier BV. https://doi.org/10.1016/j.physletb.2018.10.057