Recent content by koulbichok

Hello. If we consider PBH formation from collapse of large density perturbation in the early Universe, a mass PBH depends on density contrast as And δ must be larger then . Also we have β — an abundance of black holes, it's the ratio of the PBH energy density to the total energy density, this...

Yes, I know that abundance is how many there are, but it’s calculated as the integral of the Gaussian probability density and this isn’t a number of black holes. Where I am wrong

Hello. I'm trying to study primordial black holes for my work, but I still can't understand what are abundance and mass spectrum? Could you explain? Thanks in advance.