394 citations · 5.1k across the 105 of their papers we have counts for
105 papers
Features of a dark energy model in string theory
Souvik Banerjee, Ulf Danielsson, Suvendu Giri
In this paper we clear up misconceptions concerning the dark bubble model as a realization of dark energy in string theory. In particular we point out important differences with Ra…
A stringy realization of a small and positive cosmological constant in dark bubble cosmology
Ulf Danielsson, Oscar Henriksson, Daniel Panizo
In this paper we construct a stringy embedding of the dark bubble model of an expanding 4D cosmology with the help of branes rotating in extra dimensions. The universe rides a bubb…
Over-extremal brane shells from string theory?
Ulf Danielsson, Vincent Van Hemelryck, Thomas Van Riet
We demonstrate that, if the usual phenomenological compactifications of IIB string theory with warped throats and anti-branes make sense, there must exist spherical brane shells in…
Gravitational waves in dark bubble cosmology
Ulf Danielsson, Daniel Panizo, Rob Tielemans
In this paper we construct the 5D uplift of 4D gravitational waves in de Sitter cosmology for the brane world scenario based on a nucleated bubble in AdS5. This makes it possible t…
Re-examining the stability of rotating horizonless black shells mimicking Kerr black holes
Ulf Danielsson, Suvendu Giri
In arXiv:1705.10172 a string theory inspired alternative to gravitational collapse was proposed, consisting of a bubble of AdS space made up of ingredients from string theory. Thes…
Dynamics and Observational Signatures of Shell-like Black Hole Mimickers
Ulf Danielsson, Luis Lehner, Frans Pretorius
We undertake the task of studying the non-linear dynamics of quantum gravity motivated alternatives to black holes that in the classical limit appear as ultra-compact shells of mat…