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DTSTART:20070311T020000
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DTSTAMP:20170911T094105
DTSTART;TZID=America/Detroit:20170915T150000
DTEND;TZID=America/Detroit:20170915T160000
SUMMARY:Workshop / Seminar:HET Seminar | A New Solution to the Gravitino Problem: Suppressed Production by Sgoldstino Dynamics
DESCRIPTION:In supersymmetric theories\, the gravitino is copiously produced by the scattering of the thermal particles at the end of inflationary reheating. The gravitino is overproduced unless the reheat temperature is sufficiently low\, which is incompatible with thermal leptogenesis. This is known as the gravitino problem. In models of low scale mediation\, the field value of the sgoldstino determines the mediation scale. We point out that the sgoldstino field value can be different in the early Universe than the present one. In particular\, a large initial field value since the era of the inflationary reheating suppresses the gravitino production significantly and removes the gravitino problem. We rigorously analyze the cosmological evolution of the sgoldstino and show that the reheat temperature may well exceed the conventional upper bound\, restoring the compatibility with thermal leptogenesis.
UID:44112-9886084@events.umich.edu
URL:https://events.umich.edu/event/44112
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Free,Graduate Students,Lecture,Physics,Science,Undergraduate Students
LOCATION:West Hall - 335
CONTACT:
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