Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
Volume 29, Issue 11-12, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217751X14500730
Keywords
String phenomenology; moduli; dark matter
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Funding
- University of Michigan Physics Department
- MCTP
- String Vacuum Project
- NSF [PHY/0917807]
- DOE [DE-FG02-95ER40899]
- STFC [ST/L000326/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000326/1] Funding Source: researchfish
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In recent years it has been realized that pre-BBN decays of moduli can be a significant source of dark matter production, giving a nonthermal WIMP miracle and substantially reduced fine-tuning in cosmological axion physics. We study moduli masses and sharpen the claim that moduli dominated the pre-BBN universe. We conjecture that in any string theory with stabilized moduli there will be at least one modulus field whose mass is of order (or less than) the gravitino mass. Cosmology then generically requires the gravitino mass not be less than about 30 TeV and the cosmological history of the universe is nonthermal prior to BBN. Stable LSP's produced in these decays can account for the observed dark matter if they are wino-like. We briefly consider implications for the LHC, rare decays, and dark matter direct detection and point out that these results could prove challenging for models attempting to realize gauge mediation in string theory.
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