The ideology of dark matter and the possible constraints on it coming from The Standard Solar Model

par Valery Chechetkin (Institut Keldysh de Math. App., Moscow)

mardi 12 avr. 2011, 11:00 → 12:00 Europe/Paris

Auditorium M. Vivargent (LAPTH)

Some particle theories predict that heavy (heavier than nucleons) neutrinos may exist. Cosmological calculations show, that the existence of relic heavy neutrinos with mass over 2 GeV does not contradict the observed age of the Universe. So there were some attempts to explain the hidden mass of galaxies and clusters of galaxies by means of neutrinos with mass in interval from 2 GeV to 10 GeV. The behaviour of heavy neutrinos in the process of Galaxy formation will be discussed in the present talk. At the cosmological stage considered neutrinos may interact with the matter by gravitation only. Thus no energy dissipation due to radiation (as it is in the case for ordinary matter) take place in the gas of heavy neutrinos. However the gas of neutrinos can contract due to effective energy dissipation induced by the neutrino movement in the nonstatic gravitational field of contracting matter. Energy dissipation of the ordinary matter leads to the increase of its density. Numerical models confirm the conclusion on the contraction of neutrino gas due to increase of density. The evolution of models, containing large number of self-graviting particles, will be discussed.

Paper Ядерная_физика2.pdf

Slides Chechetkin