# The complicated story of Primordial Black Holes production in cosmological Phase Transitions

- Institution: CERN
- Department: TH institutes
- Speaker: Piotr Toczek
- Year: 2025
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3022306)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

In this talk, I will investigate the formation of Primordial Black Holes as the result of the collapse of energy density fluctuations originating from supercooled first-order phase transitions. I will present the results of a simplified approach, where the energy density fluctuations are evolved within the limit of flat FRW Universe. I will show how energy density fluctuations modify the Gravitational Wave signals as the production of secondary Gravitational Waves is induced. Finally, we will discuss the full covariant formalism of cosmological perturbation and show how it impacts the production of Primordial Black Holes and Gravitational Waves..

0:00:00 Slide 1

0:00:13 Slide 2

0:00:25 Slide 3

0:00:37 Slide 4

0:00:49 Slide 5

0:01:02 Slide 6

0:01:14 Slide 7

0:01:26 Slide 8

0:01:38 Slide 9

0:01:50 Slide 10

0:02:03 Slide 11

0:02:15 Slide 12

0:02:27 Slide 13

0:02:39 Slide 14

0:02:51 Slide 15

0:03:04 Slide 16

0:03:16 Slide 17

0:03:28 Slide 18

0:03:40 Slide 19

0:03:52 Slide 20

0:04:05 Slide 21

0:04:17 Slide 22

0:04:29 Slide 23

0:04:41 Slide 24

0:04:53 Slide 25

0:05:06 Slide 26

0:05:18 Slide 27

0:05:30 Slide 28

0:05:42 Slide 29

0:05:54 Slide 30

## Lectures

1. [The complicated story of Primordial Black Holes production in cosmological Phase Transitions](https://invisiblenetwork.ai/learn/cern/3022306/806075b09a47), 7 min (CERN's player)