TL;DR
This paper reviews cosmological evidence for dark matter, discusses potential particle candidates, and explores exotic possibilities like vacuum energy remnants and super-heavy relics.
Contribution
It provides a comprehensive review of dark matter candidates and examines novel theoretical possibilities beyond conventional particles.
Findings
Cosmological arguments support the dominance of invisible non-baryonic matter.
Potential candidates include super-heavy relics and vacuum energy remnants.
Various mass bounds for heavy neutral leptons are discussed.
Abstract
Cosmological arguments proving that the universe is dominated by invisible non-baryonic matter are reviewed. Possible physical candidates for dark matter particles are discussed. A particular attention is paid to non-compensated remnants of vacuum energy, to the question of stability of super-heavy relics, cosmological mass bounds for very heavy neutral lepton, and some other more exotic possibilities.
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