Conveners
Session 7
- Chair: Kyohei Mukaida
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Keisuke Inomata (University of Chicago, KICP)20/06/2023, 14:40Talk
Inflationary models predicting a scale-dependent large amplification of the density perturbations have recently attracted a lot of attention because the amplified perturbations can seed a sizable amount of primordial black holes (PBHs) and stochastic background of gravitational waves (GWs). While the power spectra in these models are computed based on the linear equation of motion, it is not...
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Sukannya Bhattacharya (University of Padova (INFN, Padova))20/06/2023, 15:00Talk
With the prospect of future detection of gravitational waves in the next decade and the growing interest in the cosmology of primordial black holes, it is high time to study the dynamics of relevant models of inflation in depth. Typically the models of inflation that can lead to large spectrum of induced gravitational waves and abundant primordial black holes required to reach a large...
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Michael Zantedeschi20/06/2023, 15:20Talk
In this talk I will present a novel mechanism for the formation of primordial black holes. Here, heavy quarks of a confining gauge theory produced by de Sitter fluctuations are diluted by inflation and get confined after horizon re-entry. The large amount of energy stored in the color flux tubes connecting the quark pair leads to black-hole formation. After discussing the confinement dynamics,...
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Pietro Conzinu (University of Pisa & INFN)20/06/2023, 15:40Highlight talk
I will discuss the possibility of producing a significant fraction of dark matter in the form of primordial black holes (PBHs) in the context of the pre-big bang scenario. To this purpose, we consider the enhancement of curvature perturbations possibly induced by a variation of the sound-speed parameter c_s that emerges naturally due to higher-order string corrections. We describe the...
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Joaquim Iguaz Juan (LAPTh/CNRS)20/06/2023, 15:50Highlight talk
We examined the production of large curvature perturbations that may lead to PBH formation in the early universe, in particular during preheating. At this stage, large non-linear dynamics lead to the exponential amplification of field perturbations that can ultimately collapse into a black hole or form semi-stable configurations such as oscillons (DM candiate). The details of this phenomenon...
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