6533b7d9fe1ef96bd126d5ba

RESEARCH PRODUCT

Weakly interacting dark matter particle of a minimal technicolor theory

subject

description

We consider the possibility that a massive fourth family neutrino, predicted by a recently proposed minimal technicolor theory, could be the source of the dark matter in the Universe. The model has two techniflavors in the adjoint representation of a SU(2) techicolor gauge group and its consistency requires the existence of a fourth family of leptons. By a suitable hypercharge assignment the techniquarks together with the new leptons look like a conventional fourth standard model family. We show that the new (Majorana) neutrino N can be the dark matter particle if m{sub N}{approx}100-500 GeV and the expansion rate of the Universe at early times is dominated by an energy component scaling as {rho}{sub {phi}}{approx}a{sup -6} (kination), with {rho}{sub {phi}}/{rho}{sub rad}{approx}10{sup -6} during the nucleosynthesis era.