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Moduli-induced gravitino problem

Motoi Endo
(
- DESY and
- Tokyo U., ICRR
)
,
Koichi Hamaguchi
(
- DESY
)
,
Fuminobu Takahashi
(
- DESY and
- Tokyo U., ICRR
)

Feb, 2006

5 pages

Published in:

Phys.Rev.Lett. 96 (2006) 211301

e-Print:

hep-ph/0602061 [hep-ph]

DOI:

10.1103/PhysRevLett.96.211301

Report number:

DESY-06-014

View in:

ADS Abstract Service

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Abstract:

We investigate the cosmological moduli problem by studying a modulus decay in detail and find that the branching ratio of the gravitino production is generically of O(0.01-1), which causes another cosmological disaster. Consequently, the cosmological moduli problem cannot be solved simply by making the modulus mass heavier than 100 TeV. We also illustrate our results by explicitly calculating the branching ratio into the gravitinos in the mixed modulus--anomaly/KKLT- and racetrack-type models.

14.80.Ly
04.65.+e
98.80.Cq
98.80.Ft
sparticles
cosmology
gravitino: production
moduli: decay
moduli: branching ratio

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