Possible cosmological scenario with an unstable 17-keV neutrino

Padmanabhan, T. ; Vasanthi, M. M. (1985) Possible cosmological scenario with an unstable 17-keV neutrino Nature, 317 . pp. 335-336. ISSN 0028-0836

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Official URL: http://www.nature.com/nature/journal/v317/n6035/ab...

Related URL: http://dx.doi.org/10.1038/317335a0


Simpson has recently reported evidence for a heavy neutrino of ∼17.1 keV mass. Cosmological bounds on stable neutrino species imply that this neutrino (νH) must be unstable. The most likely decay mode, νH ν → Lf where νL is a light neutrino and f is a scalar boson, leads to the cosmological scenario presented here, which is quite different from the conventional one. In this scenario, the Universe becomes matter, dominated at a redshift of z∼107 and becomes radiation-dominated (by the decay product νL of νH) at z∼310. The kinematic constraints on the lifetime of νH do not lead to any contradictions. On the other hand, the growth of baryonic perturbations is severely limited in this model because virtually no growth can take place in the radiation-dominated region z<310 and decay of νH is likely to disrupt and smooth-out past growth by a large factor. It is doubtful whether there is a simple way to avoid this difficulty.

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