Gravitino Warm Dark Matter Motivated by the CDF $eeγγ$ Event

Details Gravitino Warm Dark Matter Motivated by the CDF $eeγγ$ Event Gravitino Warm Dark Matter Motivated by the CDF $eeγγ$ Event

1996-07-10

arxiv.org/abs/hep-ph/9607273v1

Mod.Phys.Lett. A12 (1997) 1275-1282

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, a REVTEX file and two postscript figures

Scientific paper

The $ee\gamma\gamma +\rlap/E_T$ event observed by the CDF at Fermilab is naturally explained by dynamically supersymmetry breaking models and suggests the presence of the light gravitino which can be a warm dark matter. We consider large scale structure of the universe in the worm dark matter model and find that the warm dark matter plays almost the same role in the formation of the large scale structure as a cold dark matter if its mass is about $0.5$keV. We also study the Ly~$\alpha$ absorption systems which are presumed to be galaxies at high redshifts and show that the baryon density in the damped Ly~$\alpha$ absorption systems predicted by the warm dark matter model is quite consistent with the present observation.

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