Gravitino dark matter from inflaton decay

We discuss a scenario that gravitinos produced non-thermally by an inflaton decay constitute dark matter in the present universe. We find that this scenario is realized for wide ranges of the inflaton mass and the vacuum expectation value. What is intriguing about this scenario is that the gravitino dark matter can have a relatively large free streaming length at matter-radiation equality, which can be probed by future observation on QSO-galaxy strong lens system.

gravitino: dark matter
inflaton: decay
gravitino: production
neutrino: right-handed
sneutrino: right-handed
baryon: asymmetry
leptogenesis
reheating
numerical calculations

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