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Solving the gravitino problem by axino

T. Asaka
(
- Tokyo U.
)
,
T. Yanagida
(
- Tokyo U. and
- Tokyo U., RESCEU
)

Jun, 2000

7 pages

Published in:

Phys.Lett.B 494 (2000) 297-301

e-Print:

hep-ph/0006211 [hep-ph]

DOI:

10.1016/S0370-2693(00)01209-0

Report number:

UT-897

View in:

ADS Abstract Service

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Abstract: (Elsevier)

In a large class of supersymmetric (SUSY) axion models the mass of the axino ã (a fermionic superpartner of the axion) is predicted as m a ̃ ≲ O (1) keV. Thus, the axino is the lightest SUSY particle (LSP). We pointed out that such a light axino provides a natural solution to the gravitino problem, if the gravitino is the next LSP. We derive a constraint on the reheating temperature T R of inflation, T R ≲10 15 GeV for the gravitino mass m 3/2 ≃100 GeV, which is much weaker than that obtained in the minimal SUSY standard model.

supersymmetry
axion
axino: mass
gravitino: decay
sparticle: pair production
inflation
lepton: production
saxion

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Figures(0)

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