THE HOT DARK MATTER MODEL: FURTHER INVESTIGATION

The Hot Dark Matter

There is a puzzling contradiction: direct observations favor a low-mass-density universe (0.2 ≤ Ωm ≤ 0.6), but the only model which fits universe structure over more than three orders of magnitude in distance scale has a mix of hot (neutrino) and cold dark matter providing a critical density universe. Models of an open universe (low Ωm) or one adding a cosmological constant (Λ) to provide a cri...

Hot Dark Matter

The Cold plus Hot Dark Matter Model from Supersymmetric Inflation

The cold plus hot dark matter (CHDM) model is arguably the best theory we currently have for a consistent description of the observed large scale structure formation. This is especially true if the primordial density fluctuations are assumed to be essentially scale invariant, in which case a mixture with 20-25 % HDM, 510 % baryons, and the rest in CDM correctly predicted (in 1989) the quadrupol...

Hidden Hot Dark Matter as Cold Dark Matter

We show that hidden hot dark matter, hidden-sector dark matter with interactions that decouple when it is relativistic, is a viable dark matter candidate provided it has never been in thermal equilibrium with the particles of the standard model. This hidden hot dark matter may reheat to a lower temperature and number density than the visible Universe and thus account, simply with its thermal ab...

Simon Hot - dark matter , cold dark matter and accelerating universe

The Friedman equation is solved for a universe containing hot-dark matter and cold dark matter. In this scenario, hot-dark matter drives an accelerating universe no cold dark matter.