Improved determination of sterile neutrino dark matter spectrum

Ghiglieri, Jacopo; Laine, Mikko Sakari (2015). Improved determination of sterile neutrino dark matter spectrum. Journal of High Energy Physics, 2015(11) Springer 10.1007/JHEP11(2015)171

[img]
Preview
Text
art%3A10.1007%2FJHEP11%282015%29171.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (610kB) | Preview

The putative recent indication of an unidentified 3.55 keV X-ray line in certain astrophysical sources is taken as a motivation for an improved theoretical computation of the cosmological abundance of 7.1 keV sterile neutrinos. If the line is interpreted as resulting from the decay of Warm Dark Matter, the mass and mixing angle of the sterile neutrino are known. Our computation then permits for a determination of the lepton asymmetry that is needed for producing the correct abundance via the Shi-Fuller mechanism, as well as for an estimate of the non-equilibrium spectrum of the sterile neutrinos. The latter plays a role in structure formation simulations. Results are presented for different flavour structures of the neutrino Yukawa couplings and for different types of pre-existing lepton asymmetries, accounting properly for the charge neutrality of the plasma and incorporating approximately hadronic contributions.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Ghiglieri, Jacopo and Laine, Mikko Sakari

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

18 Dec 2015 09:57

Last Modified:

18 Dec 2015 09:57

Publisher DOI:

10.1007/JHEP11(2015)171

ArXiv ID:

1506.06752v2

BORIS DOI:

10.7892/boris.74090

URI:

https://boris.unibe.ch/id/eprint/74090

Actions (login required)

Edit item Edit item
Provide Feedback