Black hole formation and growth with non-Gaussian primordial density perturbations

摘要: Quasars powered by massive black holes (BHs) with mass estimates above a billion solar masses have been identified at redshift 6 and beyond. The existence of such BHs requires almost continuous growth the Eddington limit for their whole lifetime, order one years. In this paper, we explore possibility that positively skewed scale-dependent non-Gaussian primordial fluctuations may ease assembly BHs. particular, they produce more low-mass haloes high redshift, thus altering production metals ultraviolet flux, believed to be important factors in BH formation. Additionally, higher number progenitors nearly equal-mass halo mergers would boost increase provided BH–BH merger-driven accretion. We use set two cosmological simulations, either Gaussian or perform proof-of-concept experiment estimate how formation are altered. density fraction where form, both simulations popular scenarios (remnants first generation stars direct collapse absence molecular hydrogen). find fractions form identical, but perturbations total factor 2. also evolve using merger trees extracted from mean most z = 6.5 up twice values expected fluctuations.