# Black tsunamis and naked singularities in AdS

- Institution: CERN
- Department: TH String Theory Seminar
- Speaker: Marija Tomasevic
- Year: 2022
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3018801)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Adult profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

We study the evolution of the Gregory-Laflamme instability for black strings in global AdS spacetime, and investigate the CFT dual of the formation of a bulk naked singularity. Using an effective theory in the large D limit, we uncover a rich variety of dynamical behaviour, depending on the thickness of the string and on initial perturbations. These include: large inflows of horizon generators from the asymptotic boundary (a `black tsunami'); a pinch-off of the horizon that likely reveals a naked singularity; and competition between these two behaviours, such as a nakedly singular pinch-off that subsequently gets covered by a black tsunami. The holographic dual describes different patterns of heat flow due to the Hawking radiation of two black holes placed at the antipodes of a spherical universe. We also present a model that describes, in any D, the burst in the holographic stress-energy tensor when the signal from a bulk self-similar naked singularity reaches the boundary. The model shows that the shear components of the boundary stress diverge in finite time, while the energy density and pressures from the burst vanish. .

0:00:00 Slide 1

0:02:12 Slide 2

0:03:32 Slide 3

0:05:24 Slide 4

0:08:16 Slide 5

0:09:35 Slide 6

0:17:50 Slide 7

0:18:51 Slide 8

0:20:33 Slide 9

0:22:56 Slide 10

0:25:26 Slide 11

0:28:21 Slide 12

0:29:49 Slide 13

0:31:08 Slide 14

0:34:07 Slide 15

0:36:13 Slide 16

0:37:34 Slide 17

0:39:02 Slide 18

0:40:46 Slide 19

0:44:03 Slide 20

0:45:44 Slide 21

0:46:56 Slide 22

0:50:28 Slide 23

0:51:53 Slide 24

0:53:50 Slide 25

## Lectures

1. [Black tsunamis and naked singularities in AdS](https://invisiblenetwork.ai/learn/cern/3018801/22121af3cfcd), 1 h 2 min (CERN's player)