Exploring Primordial Black Holes from the Multiverse with Optical Telescopes

Abstract

Primordial black holes (PBHs) are a viable candidate for dark matter if the PBH masses are in the currently unconstrained "sublunar" mass range. We revisit the possibility that PBHs were produced by nucleation of false vacuum bubbles during inflation. We show that this scenario can produce a population of PBHs that simultaneously accounts for all dark matter, explains the candidate event in Subaru Hyper Suprime-Cam (HSC) data, and contains both heavy black holes as observed by LIGO and very heavy seeds of super-massive black holes. We demonstrate with numerical studies that future observations of HSC, as well as other optical surveys, such as LSST, will be able to provide a definitive test for this generic PBH formation mechanism if it is the dominant source of dark matter.

INTEGRAL constraints on primordial black holes and particle dark matter

“…Thus, there is a large gap between our result and the next constraint, at M PBH = 10 23 g, from Subaru microlensing data [19,24], where PBHs are currently allowed to make up all the DM. Many ideas have been proposed in order to constrain PBHs in this and higher-mass windows [82][83][84][85][86][87][88][89][90][91][92]. Additionally, we note that our constraints would be tighter for highly spinning PBHs.…”

Primordial black holes as a dark matter candidate

“…Recently Ref. [138] has studied PBH formation from the collapse of bubbles nucleated during inflation.…”

NANOGrav Hints on Planet-Mass Primordial Black Holes

“…For nanoHertz SGWB, FAST [83] and SKA [84] can increase the sensitivity for 3 to 5 orders. The microlensing search for Andromeda Galaxy by Subaru HSC can greatly avoid the unbounded planets as they mainly exist in the galactic disk [80,85]. Also, a PBH of 10 −5 M captured by the solar system as the Planet 9 can cause the orbital anomalies of the trans-Neptunian objects [86], whose surrounding minihalo [87], Hawking radiation [88], or gravitational field [89] could be probed directly.…”