Future Perspectives on Primordial Black Holes

Session

PhD student session

13 Dec 2023, 13:20

Botanical Garden of Sapienza University

Conveners

PhD student session

• Marco Bruni (University of Portsmouth)

2. A resampling search method for light primordial black hole binary inspirals

Neil Lu

Sub-solar mass binary inspirals, e.g. from primordial black holes with masses of the order of $\mathcal{O}(10^{-5})M_\odot - \mathcal{O}(10^{-3})M_\odot$, generate long transient signals that last of the orders of hours - years. A detection of such a signal would have profound implications on the understanding of cosmology, dark matter, and physics of the very early universe. We present an...

73. Constraints on primordial black holes beyond the Hawking picture

Valentin Thoss (LMU Munich)

The energy injection through Hawking evaporation has been used to put strong constraints on primordial black holes as a dark matter candidate at masses below 10^18 g. However, recent work has shown that Hawking's semiclassical approximation breaks down at latest after half-decay. Beyond this point, the evaporation could be significantly suppressed. In this work, we review existing cosmological...

13. Gravothermalizing into primordial black holes

Daniele Perri

Very little is known about the universe's history from after the end of inflation until the Big Bang nucleosynthesis (BBN), which spans more than $10^{39}$ orders of magnitude in time scales. In this work, we show that if there was a long period of matter domination in this unknown period, and if the particle causing the matter domination has moderate self-interactions, then the matter...

22. Impact of Dark Matter spikes on the merger rates of Primordial Black Holes

Pratibha Jangra (IFCA, CSIC - UC)

Primordial Black Holes (PBHs) may form in the early Universe by formation mechanisms such as large density fluctuations, bubble collisions, collapse of domain walls or collapse of cosmic strings. PBHs are considered as one of the possible candidates for dark matter. A huge amount of work has been done on PBHs because it is considered that the merger of PBHs binaries can also lead to the origin...

27. PBHs in no-scale Supergravity and their associated GW signal in Nanograv and beyond

Charalampos Tzerefos (University of Athens)

In this talk, I am going to present our recent work where we derive a characteristic three-peaked GW signal within the framework of no-scale Supergravity, which arises as a low energy limit of superstring theory. We concentrate on the primordial gravitational wave (GW) spectrum induced due to second-order gravitational interactions by inflationary curvature perturbations as well as by...

8. Primordial black holes from strong first order phase transitions

Piotr Toczek (University of Warsaw)

This talk is aimed to analyze the possibility of Primordial Black Holes (PBHs) production during supercooled first order phase transitions in the Early Universe.
The transition proceeds through the nucleation of bubbles of the broken phase in an initial background of the symmetric phase, which later collide and percolate, finishing the conversion of the Universe, with their nucleation rate...

16. Scalar Induced Gravitational Waves: from early universe to PBH evolution

Anjali Abirami Kugarajh (Istituto Nazionale di Fisica Nucleare)

Observations of gravitational waves (GWs) have opened up a new door to study the most energetic phenomena in our Universe. Among the variety of signals that we expect to observe with current and next generation of detectors, Primordial GW offer the exciting opportunity to explore the physics of the early Universe. They are generated from quantum vacuum fluctuations and come in the form of a...

9. The impact of primordial black holes on the stellar mass function of ultra-faint dwarf galaxies

Nicolas Esser (PhysTH (Université Libre de Bruxelles))

In the hypothesis of primordial black holes constituting the dark matter, stars forming in dark matter dominated environments with low velocity dispersions, such as ultra-faint dwarf galaxies, may capture a primordial black hole at birth. The capture probability is non-negligible for primordial black holes of masses around $10^{20}$ g, and increases with the stellar mass. Moreover, infected...