Description
https://pitt.zoom.us/j/93567042779
In the early universe, black holes can easily produce monopoles. Via Hawking radiation, evaporating black holes heat up the surrounding plasma and create a temperature profile around the black hole that features symmetry restoration near the center. Eventually, this region cools off and undergoes the Kibble mechansim, producing monopoles. We demonstrate that this process can very...
Primordial black holes (PBHs) lighter than $5\times 10^{14}\,$g cannot constitude the dark matter (DM) because they are already evaporated, but they are constrained by early universe phenomena (BBN, CMB). PBHs lighter than $10^9\,$g, however, are at present mostly unconstrained. In this talk, we will present scenarios where light (spinning) PBHs with $M_\text{PBH}<10^9\,$g evaporate in the...
We present precision calculations of dark radiation in the form of gravitons coming from Hawking evaporation of spinning primordial black holes (PBHs) in the early Universe. Our calculation incorporates a careful treatment of extended spin distributions of a population of PBHs, the PBH reheating temperature, and the number of relativistic degrees of freedom. We compare our precision results...
According to our current models of stellar collapse, stars in the mass range ~64-135 M⊙ undergo pair-instability supernovae, leaving behind no remnant. However, in 2019 LIGO and Virgo detected a black hole merger event with a high probability that the mass of the heavier black hole was within this pair-instability mass gap, motivating the exploration of novel black hole formation mechanisms....
Magnetically charged black holes (MBHs) are interesting solutions of the Standard Model and general relativity. They may possess a “hairy” electroweak-symmetric corona outside the event horizon, which speeds up their Hawking radiation and leads them to become nearly extremal on short timescales. Their masses could range from the Planck scale up to the Earth mass. We study various methods to...
