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Entropy 2012, 14(5), 958-965; doi:10.3390/e14050958
Article

On Chirality of the Vorticity of the Universe

Division of Theoretical Physics, Rugjer Boškovic Institute, Bijenicka cesta 54, P.O.B. 180, HR-10002 Zagreb, Croatia
Received: 16 April 2012 / Accepted: 11 May 2012 / Published: 16 May 2012
(This article belongs to the Special Issue Modified Gravity: From Black Holes Entropy to Current Cosmology)
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Abstract

The presence of dark energy in the Universe challenges the Einstein’s theory of gravity at cosmic scales. It motivates the inclusion of rotational degrees of freedom in the Einstein–Cartan gravity, representing the minimal and the most natural extension of the General Relativity. One can, consequently, expect the violation of the cosmic isotropy by the rotating Universe. We study chirality of the vorticity of the Universe within the Einstein–Cartan cosmology. The role of the spin of fermion species during the evolution of the Universe is studied by averaged spin densities and Einstein–Cartan equations. It is shown that spin density of the light Majorana neutrinos acts as a seed for vorticity at early stages of the evolution of the Universe. Its chirality can be evaluated in the vicinity of the spacelike infinity. It turns out that vorticity of the Universe has right-handed chirality.
Keywords: Einstein–Cartan cosmology; vorticity; Majorana neutrinos Einstein–Cartan cosmology; vorticity; Majorana neutrinos
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Palle, D. On Chirality of the Vorticity of the Universe. Entropy 2012, 14, 958-965.

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