Description
https://pitt.zoom.us/j/93567042779
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Saurav Das (University of Maryland College Park)26/05/2021, 14:00Cosmology
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...
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Jeremy Auffinger (Institut d'Astrophysique de Paris)26/05/2021, 14:15Cosmology
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...
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Barmak Shams Es Haghi (University of Utah)26/05/2021, 14:30Cosmology
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...
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Ethan Villarama (UCSD)26/05/2021, 14:45
Primordial black holes (PBHs) can form as a result of primordial scalar perturbations at small scales. This PBH formation scenario has associated gravitational wave (GW) signatures from second-order GWs induced by the primordial curvature perturbation, and from second-order GWs produced by the gravitational potential of the PBHs themselves. We investigate the ability of next generation GW...
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Lillian Santos-Olmsted (University of California, Santa Cruz)26/05/2021, 15:00
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....
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Mrunal Korwar (University of Wisconsin-Madison)26/05/2021, 15:15
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...
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Lars Aalsma26/05/2021, 15:30Cosmology
Recent works have revealed that the fine-grained entropy of a non-gravitating subsystem, when entangled with a gravitating region, can receive contributions from so-called quantum extremal islands. Applied to black holes, this reproduces the unitary Page curve for Hawking radiation. In this talk, I will show how these results can be applied to the thermal radiation measured by a static...
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Gregory Kaplanek26/05/2021, 15:45
Perturbation theory for gravitating quantum systems tends to fail at very late times (a type of perturbative breakdown known as secular growth). We argue that gravity is best treated as a medium/environment in such situations, where reliable late-time predictions can be made using tools borrowed from quantum optics. To show how this works, we study the explicit example of a qubit hovering just...
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