Spin precession in anisotropic cosmologies

The European Physical Journal C

O. V. Teryaev¹  A. Yu. Kamenshchik² 

[1] Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980, Dubna, Russia;Lomonosov Moscow State University, GSP-1, Leninskie Gory, 119991, Moscow, Russia;Dipartimento di Fisica e Astronomia, Università di Bologna and INFN, via Irnerio 46, 40126, Bologna, Italy;L. D. Landau Institute for Theoretical Physics, 119334, Moscow, Russia;

关键词: Early Universe;    Equivalence Principle;    Sterile Neutrino;    Dirac Particle;    Spin Precession;   

DOI  :  10.1140/epjc/s10052-016-4141-6

来源: Springer

【 摘 要 】

We consider the precession of a Dirac particle spin in some anisotropic Bianchi universes. This effect is present already in the Bianchi-I universe. We discuss in some detail the geodesics and the spin precession for both the Kasner and the Heckmann–Schucking solutions. In the Bianchi-IX universe the spin precession acquires the chaotic character due to the stochasticity of the oscillatory approach to the cosmological singularity. The related helicity flip of fermions in the very early universe may produce the sterile particles contributing to dark matter.

【 授权许可】

CC BY