New class of Black Holes

Abstract

Cosmological neutrinos and anti-neutrinos are thought to have been created in the Big Bang in almost unlimited numbers. Being Fermions, they may condense into stable objects called Condensed Neutrino Objects (CNO). CNOs could be the Dark Matter everyone is looking for. Weak lensing data indicates that the degenerate neutrino mass (called the neutrino mass scale) ∼0.8 eV/c2. Being condensed degenerate matter, CNO have a maximum mass that can be sustained through internal momentum pressure, just as neutron stars and white dwarfs. We calculate this maximum mass, MC. We find that the critical radius for gravitational instability is 4.307RS, independent of the value of the degenerate neutrino mass, where RS is the CNO Schwarzschild radius. CNOs accreting more mass than MC become hyper-massive black holes (called in this paper ‘Ultra Black Holes-UBH’), where MBH≃4×1017M⊙. We discuss the origin of these objects, why they are x-ray quiet and why their discovery signature is the perturbation of the cosmological microwave background.