HEP department seminar by Béatrice Bonga

Monday 26 Sept 2022, 12:30 → 13:30 Europe/Amsterdam

https://urldefense.com/v3/__https://radbouduniversity.zoom.us/j/828394 (Zoom)

TITLE: Instabilities of wormholes, gravastars and other thin-layer black hole mimickers     

Abstract: The standard astrophysical description of dark and compact objects are black holes. However, there are many theoretical alternatives consistent with current observations.
Such alternatives are dubbed black hole mimickers and often involve a thin layer at their boundary in order to reach compactness (=mass/radius) close to that of black holes.
Using simple Newtonian physics, I will show that these alternatives with thin layers are all unstable to perturbations in the small wavelength limit, whenever their pressure divided by the surface density is positive.
As a result, wormholes, gravastars and AdS bubbles are unstable in a large part of their parameter space. [Based on arXiv:2207.13754 ]