Chiral gravitational waves from thermalized neutrinos in the early Universe

Philipp Gubler, Naoki Yamamoto, Di-Lun Yang

研究成果: Article査読

1 被引用数 (Scopus)


We investigate polarized gravitational waves generated by chiral fermions in the early Universe. In particular, we focus on the contribution from left-handed neutrinos in thermal equilibrium with finite temperature and chemical potential in the radiation dominated era. We compute the correlation functions of gravitational fields pertinent to the Stokes parameter V characterizing the circular polarization of gravitational waves in the Minkowski and expanding spacetime backgrounds. In the expanding universe, we find that the thermalized neutrinos induce a non-vanishing V linear to the neutrino degeneracy parameter and wavenumber of gravitational waves in the long wavelength region. While the magnitude of the gravitational waves generated by thermal neutrinos is too small to be detectable by current and planned third generation gravitational wave detectors, their observations by future generation detectors for ultra-high frequency regimes could provide information on the neutrino degeneracy parameter in the early Universe.

ジャーナルJournal of Cosmology and Astroparticle Physics
出版ステータスPublished - 2022 9月 1

ASJC Scopus subject areas

  • 天文学と天体物理学


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