New astrophysical constraint on radiatively decaying neutrinos

Sethi, S.K.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4936

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DC Field	Value	Language
dc.contributor.author	Sethi, S.K.	-
dc.date.accessioned	2012-07-14T10:30:44Z	-
dc.date.available	2012-07-14T10:30:44Z	-
dc.date.issued	1996	-
dc.identifier.citation	Physical Review D, 1996, Vol.54, p1301	en
dc.identifier.issn	1550-7998	-
dc.identifier.issn	1550-2368(Online)	-
dc.identifier.uri	http://hdl.handle.net/2289/4936	-
dc.description	Restricted Access	en
dc.description.abstract	We calculate constraints on radiatively decaying neutrinos from the recent detection of singly ionized helium in the diffuse intergalactic medium (IGM) at z~=3.3. We consider a model in which neutrinos predominantly decay into invisible relativistic particles with a rate τ-1, and with a small branching ratio into the radiative mode. To satisfy the observation, which puts a lower bound on the number density of singly ionized helium atoms in the IGM, we show that, for τ>~1018 sec (1 eV/m2ν), transition moment of neutrinos, μ12, is constrained to be <=4-8×10-17 μB for 110 eV<~mν<~10 keV. Implications of this bound for particle physics and cosmology are briefly discussed.	en
dc.language.iso	en	en
dc.publisher	American Physical Society	en
dc.relation.uri	http://adsabs.harvard.edu/abs/1996PhRvD..54.1301S	en
dc.relation.uri	http://arxiv.org/abs/astro-ph/9507116	en
dc.relation.uri	http://dx.doi.org/10.1103/PhysRevD.54.1301	en
dc.rights	1996 American Physical Society	en
dc.subject	Decays of heavy neutrinos	en
dc.subject	Electromagnetic decays	en
dc.subject	Intergalactic matter	en
dc.subject	quasar absorption and emission-line systems	en
dc.subject	Lyman forest	en
dc.title	New astrophysical constraint on radiatively decaying neutrinos	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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