Neutrino masses and gravitational wave background

We consider the Standard Model with three right-handed neutrinos to generate tiny neutrino masses by the seesaw mechanism. Especially, we investigate the case when one right-handed neutrino has the suppressed Yukawa coupling constants. Such a particle has a long lifetime and can produce an additiona...

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Main Authors:	Takehiko Asaka, Hisashi Okui
Format:	Article
Language:	English
Published:	Elsevier 2021-03-01
Series:	Physics Letters B
Online Access:	http://www.sciencedirect.com/science/article/pii/S0370269321000149

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spelling	doaj-c05b4014329344709b0f1e8e4d173a5c2021-02-25T04:16:34ZengElsevierPhysics Letters B0370-26932021-03-01814136074Neutrino masses and gravitational wave backgroundTakehiko Asaka0Hisashi Okui1Department of Physics, Niigata University, Niigata 950-2181, JapanGraduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan; Corresponding author.We consider the Standard Model with three right-handed neutrinos to generate tiny neutrino masses by the seesaw mechanism. Especially, we investigate the case when one right-handed neutrino has the suppressed Yukawa coupling constants. Such a particle has a long lifetime and can produce an additional entropy by the decay. It is then discussed the impact of the entropy production on the gravitational wave background originated in the primordial inflation. We show that the mass and the coupling constants of the long-lived right-handed neutrino can be probed by the distortion of the gravitational wave spectrum, leading to the information of the mass of the lightest active neutrino.http://www.sciencedirect.com/science/article/pii/S0370269321000149
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Takehiko Asaka Hisashi Okui
spellingShingle	Takehiko Asaka Hisashi Okui Neutrino masses and gravitational wave background Physics Letters B
author_facet	Takehiko Asaka Hisashi Okui
author_sort	Takehiko Asaka
title	Neutrino masses and gravitational wave background
title_short	Neutrino masses and gravitational wave background
title_full	Neutrino masses and gravitational wave background
title_fullStr	Neutrino masses and gravitational wave background
title_full_unstemmed	Neutrino masses and gravitational wave background
title_sort	neutrino masses and gravitational wave background
publisher	Elsevier
series	Physics Letters B
issn	0370-2693
publishDate	2021-03-01
description	We consider the Standard Model with three right-handed neutrinos to generate tiny neutrino masses by the seesaw mechanism. Especially, we investigate the case when one right-handed neutrino has the suppressed Yukawa coupling constants. Such a particle has a long lifetime and can produce an additional entropy by the decay. It is then discussed the impact of the entropy production on the gravitational wave background originated in the primordial inflation. We show that the mass and the coupling constants of the long-lived right-handed neutrino can be probed by the distortion of the gravitational wave spectrum, leading to the information of the mass of the lightest active neutrino.
url	http://www.sciencedirect.com/science/article/pii/S0370269321000149
work_keys_str_mv	AT takehikoasaka neutrinomassesandgravitationalwavebackground AT hisashiokui neutrinomassesandgravitationalwavebackground
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Neutrino masses and gravitational wave background

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