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Статья

Saha, B.
Spinor Field in Bianchi Type-II Universe / B.Saha // Romanian Journal of Physics [Electronic resource]. – 2023. – Vol. 68, No. 1/2. – P. 101. – URL: https://rjp.nipne.ro/2023_68_1-2/RomJPhys.68.101.pdf. – Bibliogr.: 36.

Within the scope of Bianchi type-II cosmological model we have studied the role of spinor field in the evolution of the Universe. It is found that in this case the components of energy-momentum tensor of spinor field along the principal axis are different, i.e. T 1 1 6= T 2 2 6= T 3 3 , even in absence of spinor field nonlinearity. The presence of nontrivial non-diagonal components of energy-momentum tensor of the spinor field imposes severe restrictions both on geometry of space-time and on the spinor field itself. Depending on the choice of f(x3) the space-time might be either locally rotationally symmetric or isotropic. In this paper we considered the Bianchi type-II space-time both for a trivial and nontrivial b. It was found that while a positive λ1 in case of f 0 6= 0 gives rise to oscillatory mode of evolution, in case of f 0 = 0 it leads to accelerated mode of expansion.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 322.2 - Космология. Гравитационные волны