Neutrino dynamics below the electroweak crossover

Ghiglieri, Jacopo; Laine, Mikko Sakari (2016). Neutrino dynamics below the electroweak crossover. Journal of cosmology and astroparticle physics, 2016(07), 015. Institute of Physics Publishing IOP 10.1088/1475-7516/2016/07/015

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We estimate the thermal masses and damping rates of active (m < eV) and sterile (M ~ GeV) neutrinos with thermal momenta k~ 3T at temperatures below the electroweak crossover (5 GeV < T < 160 GeV) . These quantities fix the equilibration or "washout" rates of Standard Model lepton number densities. Sterile neutrinos interact via direct scatterings mediated by Yukawa couplings, and via their overlap with active neutrinos. Including all leading-order reactions we find that the washout rate generally exceeds the Hubble rate for 5 GeV < T < 30 GeV . Therefore it is challenging to generate a large lepton asymmetry facilitating dark matter computations operating at T < 5 GeV, whereas the generation of a baryon asymmetry at T > 130 GeV remains an option. Our differential rates are tabulated in a form suitable for studies of specific scenarios with given neutrino Yukawa matrices.

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:

1475-7516

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

22 Aug 2016 12:40

Last Modified:

22 Aug 2016 12:40

Publisher DOI:

10.1088/1475-7516/2016/07/015

ArXiv ID:

1605.07720

BORIS DOI:

10.7892/boris.86113

URI:

https://boris.unibe.ch/id/eprint/86113

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