Dynamical scenarios with unstable heavy neutrino

Padmanabhan, T. ; Vasanthi, M. M. (1987) Dynamical scenarios with unstable heavy neutrino The Astrophysical Journal, 315 . pp. 411-419. ISSN 0004-637X

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Official URL: http://adsabs.harvard.edu/cgi-bin/nph-data_query?b...

Related URL: http://dx.doi.org/10.1086/165145


A cosmological scenario with an unstable warm dark matter candidate (a heavy neutrino νH with mass of about 120 eV) which decays into a 'hot' particle (a light nuetrino νL with mass of about ~6 eV) and a relativistic boson is described. Theoretical and observational constraints on such a model are discussed. It is noted that decay of νH disrupts the condensates made of primordial νL, lowering their mass to acceptable values of about ~1012 M. (2) The relativistic boson can contribute nearly 0.25 to the total density in a 'recent' decay. The model predicts two prominent scales in dark matter distribution: (i) a mass of about ~4 × 1012M around the galaxies, distributed over about ~200 kpc, and (ii)a smoother density of about ~10-27 g cm-3 distributed over about ~1 Mpc. It is argued that the model agrees with observations at all scales.

Item Type:Article
Source:Copyright of this article belongs to The American Astronomical Society.
Keywords:Astronomical Models; Cosmology; Dark Matter; Neutrinos; Energy Distribution; Relativistic Particles
ID Code:72436
Deposited On:29 Nov 2011 05:17
Last Modified:29 Nov 2011 05:17

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