Saxion cosmology for thermalized gravitino dark matter

Co, Raymond T.; D’Eramo, Francesco; Hall, Lawrence J.; Harigaya, Keisuke

doi:10.1007/JHEP07(2017)125

Title: Saxion cosmology for thermalized gravitino dark matter

Journal Article · Wed Jul 26 00:00:00 EDT 2017 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP07(2017)125· OSTI ID:1418294

Co, Raymond T. ^[1]; D’Eramo, Francesco ^[2]; Hall, Lawrence J. ^[1]; Harigaya, Keisuke ^[1]

Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Theoretical Physics Group
Univ. of California, Santa Cruz, CA (United States). Dept. of Physics ; Univ. of California, Santa Cruz, CA (United States). Santa Cruz Inst. for Particle Physics

In all supersymmetric theories, gravitinos, with mass suppressed by the Planck scale, are an obvious candidate for dark matter; but if gravitinos ever reached thermal equilibrium, such dark matter is apparently either too abundant or too hot, and is excluded. However, in theories with an axion, a saxion condensate is generated during an early era of cosmological history and its late decay dilutes dark matter. We show that such dilution allows previously thermalized gravitinos to account for the observed dark matter over very wide ranges of gravitino mass, keV < m _3/2 < TeV, axion decay constant, 10⁹ GeV < f_a < 10¹⁶ GeV, and saxion mass, 10 MeV < m_s < 100 TeV. Constraints on this parameter space are studied from BBN, supersymmetry breaking, gravitino and axino production from freeze-in and saxion decay, and from axion production from both misalignment and parametric resonance mechanisms. Large allowed regions of (m_3/2, f_a, m_s) remain, but differ for DFSZ and KSVZ theories. Superpartner production at colliders may lead to events with displaced vertices and kinks, and may contain saxions decaying to (WW, ZZ, hh), gg, γγ or a pair of Standard Model fermions. In conclusion, freeze-in may lead to a sub-dominant warm component of gravitino dark matter, and saxion decay to axions may lead to dark radiation.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Simons Foundation

Grant/Contract Number:: AC02-05CH11231; PHY-1316783; PHY-1521446; DGE 1106400; SC0010107

OSTI ID:: 1418294

Journal Information:: Journal of High Energy Physics (Online), Vol. 2017, Issue 7; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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