6 papers
Bubble needs strings
Souvik Banerjee, Ulf Danielsson, Suvendu Giri
In this paper, we want to emphasize the pivotal role played by strings in the model realizing de Sitter using an expanding bubble, proposed and subsequently developed in arXiv:1807…
Dark bubbles: decorating the wall
Souvik Banerjee, Ulf Danielsson, Suvendu Giri
Motivated by the difficulty of constructing de Sitter vacua in string theory, a new approach was proposed in arXiv:1807.01570 and arXiv:1907.04268, where four dimensional de Sitter…
de Sitter Cosmology on an expanding bubble
Souvik Banerjee, Ulf Danielsson, Giuseppe Dibitetto +2
Constructing an explicit compactification yielding a metastable de Sitter (dS) vacuum in a UV consistent string theory is an incredibly difficult open problem. Motivated by this is…
Constructing stable de Sitter in M-theory from higher curvature corrections
Johan Blåbäck, Ulf Danielsson, Giuseppe Dibitetto +1
We consider dimensional reductions of M-theory on with the inclusion of arbitrary metric flux and spacetime filling KK monopoles. With these ing…
Emergent de Sitter Cosmology from Decaying AdS
Souvik Banerjee, Ulf Danielsson, Giuseppe Dibitetto +2
Recent developments in string compactifications demonstrate obstructions to the simplest constructions of low energy cosmologies with positive vacuum energy. The existence of obsta…
Black holes as bubbles of AdS
U. H. Danielsson, G. Dibitetto, S. Giri
In this paper we propose that bubbles of AdS within Minkowski spacetime, stabilized at a finite radius by stiff matter and an electromagnetic gas, can be an alternative endpoint of…