Conveners
Session 2
- Chair: Dr Michael Hawkins
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Prof. Ruth Gregory (King's College London)17/06/2024, 11:00
I will review some past work on slow roll inflation with a black hole, showing how the growth of the horizon can be computed. I will then discuss how the picture can change with ultra slow rolling scalars.
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Louis Hamaide17/06/2024, 11:30
The Hawking evaporation of primordial black holes (PBH) reheats the Universe locally, forming hot spots that survive throughout their lifetime. We propose to use the temperature profile of such hot spots to calculate the decay rate of metastable vacua in cosmology, avoiding inconsistencies inherent to the Hartle-Hawking or Unruh vacuum. We apply our formalism to the case of the electroweak...
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Renee Key (Swinburne University of Technology)17/06/2024, 11:50
Gravitational microlensing is known as a productive method for exoplanet discovery and characterisation, and crucially, it also provides an experimental avenue to constrain the galactic PBH abundance in the mass regime from ~ 10−12 M⊙ (i.e. asteroid-mass scale) to ∼ 1000 M⊙. The key to probing the very lowest masses is fast cadence observations on the order of hours to minutes. We previously...
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Nicolas Esser (Université Libre de Bruxelles (ULB), Theoretical Physics Group (PhysTH))17/06/2024, 12:00
If primordial black holes (PBHs) constitute the dark matter (DM), stars forming in dark-matter dominated environments with low velocity dispersions, such as ultra-faint dwarf galaxies, may capture a black hole at birth. The capture probability is non-negligible for PBHs of masses around $10^{20}$g, and increases with stellar mass. Moreover, infected stars are turned into virtually invisible...
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Agnese Tolino (IFIC (CSIC-UV))17/06/2024, 12:10
In this talk, I will discuss possible probes of Heavy Neutral Leptons (HNLs) with Primordial Black Holes (PBHs).
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If produced in the early Universe with an initial mass of ∼ $10^{15}$ g, PBHs are expected to evaporate at the present time producing sizable
fluxes of particles in their last instants. These “exploding” black holes will emit bursts of
Standard Model particles as well as new...