Primordial black hole formation from an axionlike curvaton model

Abstract

We argue that the existence of the cold dark matter is explained by primordial black holes. We show that a significant number of primordial black holes can be formed in an axion-like curvaton model, in which the highly blue-tilted power spectrum of primordial curvature perturbations is achieved. It is found that the produced black holes with masses ∼ 10 20 − 10 38 g account for the present cold dark matter. We also argue the possibility of forming the primordial black holes with mass ∼ 10 5 M as seeds of the supermassive black holes.

Production of high stellar-mass primordial black holes in trapped inflation

“…However, the resulting PBH masses in most of these models are many orders of magnitude below M ⊙ . To boost the PBH mass into astrophysical and even cosmological mass scales, several scenarios involving multi-field inflation have been proposed, such as the hybrid inflation, 4 the double inflation [21][22][23][24], and the curvaton models [25,26], in which small-scale density perturbation can be inflated to a scale ranging from the size of a stellar-mass PBH to a supermassive PBH. The astrophysical and cosmological bounds on PBHs have been used to exclude or constrain all these models.…”

Baryon asymmetry, dark matter, and density perturbation from primordial black holes

“…[63]. 8 Let us compute the spectrum of gravitational waves from the PBH evaporation. Suppose that gravitons emitted with a frequency ν ∼ ν + dν at a time t reach us with a frequency ν 0 at the present time t 0 .…”

“…It is known that black holes can be produced in the early universe by various processes like large density perturbations generated from an inflaton [1][2][3][4][5][6], a curvaton [7,8] or preheating [9], sudden reduction in the pressure [10], bubble collisions [11][12][13] and collapses of cosmic strings [14] (For reviews, see refs. [15,16]).…”

Massive primordial black holes from hybrid inflation as dark matter and the seeds of galaxies

“…sharp peaks in density contrast fluctuations generated during inflation [16], first-order phase transitions [17], resonant reheating [18], tachyonic preheating [19] or some curvaton scenarios [20][21][22]. Large curvature perturbations on smaller scales than the ones probed by cosmic microwave background (CMB) anisotropy experiments can also be generated during inflation [5,6,[23][24][25][26][27][28][29][30], e.g.…”