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http://hdl.handle.net/2289/4898
Title: | Decaying Neutrinos and Large-Scale Structure Formation |
Authors: | Bharadwaj, Somnath Sethi, S.K. |
Issue Date: | 1998 |
Publisher: | Institute of Physics |
Citation: | Astrophysical Journal Supplement Series, 1998, Vol.114, p37 |
Abstract: | We study the growth of density perturbations in a universe with unstable dark matter particles. The mass (m nu ) range 30 eV <= m nu <= 10 keV with lifetimes (td) in the range 107 s <= td <= 1016 s are considered. We calculate the COBE normalized matter power spectrum for these models. We find that it is possible to construct models consistent with observations for masses m nu > 50 eV by adjusting td so as to keep the quantity m2_ν({keV})td({yr}) constant at a value around 100. For m nu <= 1 keV, the power spectrum has extra power at small scales that could result in an early epoch of galaxy formation. We do not find any value of td that gives a viable model in the mass range m nu <= 50 eV. We also consider the implications of radiatively decaying neutrinos--models in which a small fraction B << 1 of neutrinos decay into photons--that could possibly ionize the intergalactic medium (IGM) at high redshift. We show that the parameter space of decaying particles that satisfies the IGM observations does not give viable models of structure formation. |
Description: | Restricted Access |
URI: | http://hdl.handle.net/2289/4898 |
ISSN: | 0067-0049 1538-4365 (Online) |
Alternative Location: | http://adsabs.harvard.edu/abs/1998ApJS..114...37B http://arxiv.org/abs/astro-ph/9707143 http://dx.doi.org/10.1086/313065 |
Copyright: | 1998 The American Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
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1998_Astro Jour Suppliment Ser_Vol.114_p37.pdf Restricted Access | Restricted Access | 712.96 kB | Adobe PDF | View/Open Request a copy |
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