Stable matter of 4th generation: hidden in the Universe and close to detection?
K. Belotsky, M. Khlopov, K. Shibaev
Abstract
Stable neutrino and U quark of 4th generation are excluded neither by experimental data, nor by astrophysical constraints. Moreover, excess of stable U quarks in the Universe can lead to an exciting composite nuclear-interacting form of dark matter, which can even dominate in large scale structure formation.
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