MG14 - Talk detail

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Abstract

The vast majority of the material content of the universe (about 95%) is made of unknown substances called dark matter and dark energy which manifest themselves only through gravity. The search for and identification of their carriers, as well as understanding their nature, are the main challenges to modern physics and cosmology. Given a number of inconsistencies faced by traditional cold, warm and hot models we develop an alternative approach based on the representation of dark matter as gravitating tachyon background. This is, in a sense, the revival of the historically first neutrino dark matter model, but with a fundamentally new assumption consistent with observations that neutrinos might exist in tachyonic almost sterile states. This removes constraints on the value of neutrino energy density and so the primordial tachyon neutrino background might play the essential role in the universe evolution. To this end we propose to upgrade the neutrino sector in the Standard Model and first of all to develop an original group-theoretical algorithm for description of tachyons such that it does not require traditional introduction of imaginary masses and negative energies, and therefore does not lead to violation of causality or unitarity. The proposed algorithm produces also the correct tachyonic versions of Dirac- and Klein-Gordon equations. The ultimate model based on effectively scalar tachyonic neutrino-antineutrino conglomerate is applied to the analysis of structure formation and of observational effects on the scales of galaxies and clusters. The interrelation between tachyonic dark matter and dark energy permits to consider them as non-interacting during the long time universe evolution excluding the initial stage.

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