6 papers · 1 filter
Quantum nucleation of black hole mimickers via chaos dominated tunneling
Ulf Danielsson, Suvendu Giri, Vyshnav Mohan +1
Black hole mimickers, ultracompact horizonless objects, have been proposed as alternatives to black holes in a variety of settings, including extensions of general relativity and s…
Weak gravity at micron scales from dark bubble cosmology and its cosmological consequences
Ulf Danielsson, Suvendu Giri
The dark bubble model makes a positive cosmological constant natural in string theory, and predicts several new physical phenomena within reach in the near future. In this paper we…
Dark bubbles, dark dimensions and fat gravitons
Ulf Danielsson, Suvendu Giri
The dark bubble model explains the existence of a positive cosmological constant by making explicit use of the instabilities underlying the de Sitter swampland conjectures to make…
Self-gravitating electromagnetic waves in the dark bubble model
Ulf Danielsson, Daniel Panizo, Vincent Van Hemelryck
We construct embeddings of gravitational and electromagnetic waves in the dark bubble scenario using pp-wave geometries in AdS5, motivated by the fact that pp-wave spacetimes often…
Black Shell Thermodynamics
Ulf Danielsson, Vyshnav Mohan, Larus Thorlacius
Black shells have been proposed as black hole mimickers, i.e. horizonless ultra-compact objects that replace black holes. In this paper, we assume the existence of black shells and…
Charged Nariai black holes on the dark bubble
Ulf Danielsson, Vincent Van Hemelryck
In this paper, we realise the charged Nariai black hole on a braneworld from a nucleated bubble in AdS, known as the dark bubble model. Geometrically, the black hole takes the…