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Astron. Astrophys. 349, 317-322 (1999)

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Could intergalactic dust obscure a neutrino decay signature?

J.M. Overduin, S.S. Seahra, W.W. Duley and P.S. Wesson

Department of Physics, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada

Received 24 December 1998 / Accepted 26 May 1999

Abstract

Following recent results from the Super-Kamiokande experiment which indicate that neutrinos may have finite masses and provide at least part of the dark matter in the Universe, we re-examine the decaying neutrino hypothesis of Sciama, including for the first time the effects of absorption by intergalactic dust. We consider several dust models, including one designed to optimize ultraviolet extinction for a given dust-to-gas ratio. Dust absorption is insufficient to reconcile the theory with observational upper limits on the intensity of the diffuse ultraviolet background reported recently by Murthy et al. The theory remains marginally compatible with other diffuse background measurements.

Key words: cosmology: dark matter – cosmology: diffuse radiation – ISM: dust, extinction

Send offprint requests to: J.M. Overduin, Gravity Probe B, Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA (overduin@step.stanford.edu)

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 1999

Online publication: August 25, 1999
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