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Crisis on Infinite Earths: Short-lived de Sitter Vacua in the String Theory Landscape
Heliudson Bernardo, Suddhasattwa Brahma, Keshav Dasgupta +1
We construct purely non-perturbative anti-de Sitter vacua in string theory which, on uplifting to a de Sitter (dS) one, have a decay time many orders of magnitude smaller than thos…
Reheating after S-Brane Ekpyrosis
Robert Brandenberger, Keshav Dasgupta, Ziwei Wang
In recent work, two of us proposed a nonsingular Ekpyrotic cosmology making use of an S-brane which forms at the end of the phase of Ekpyrotic contraction. This S-Brane mediates a…
de Sitter Space as a Glauber-Sudarshan State
Suddhasattwa Brahma, Keshav Dasgupta, Radu Tatar
Glauber-Sudarshan states, sometimes simply referred to as Glauber states, or alternatively as coherent and squeezed-coherent states, are interesting states in the configuration spa…
Four-dimensional de Sitter space is a Glauber-Sudarshan state in string theory
Suddhasattwa Brahma, Keshav Dasgupta, Radu Tatar
We show that four-dimensional de Sitter space is a Glauber-Sudarshan state, i.e. a coherent state, over a supersymmetric solitonic background in full string theory. We argue that s…