Theory Seminar (High Energy/Cosmology)

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De Sitter from D3-branes?
Date: Thursday, March 15th
Time: 3:30 pm
Place: 5280 Chamberlin Hall
Speaker: Ander Retolaza, DESY Theory Group
Abstract: If de Sitter vacua exist in string theory compacti cations is an unanswered question. All attempts to realize such vacua are based on 4D e effective field theory descriptions. The standard procedure to construct them first deals with moduli stabilization, generically leading to anti de Sitter space, and then adds a localized source which increases the vacuum energy while leaving the stabilization untouched, typically an anti-D3-brane on a warped throat. These 4D ideas conflict with higher dimensional results telling that
in warped compacti cations one needs to include some object that violates the strong energy condition to obtain 4D de Sitter.
In this talk I will provide a 10D description of a popular 4D construction to obtain de Sitter and show that the 4D eff ective field theory misses a crucial point when trying to uplift the vacuum energy above zero. Then, I will apply this knowledge to other models in the market.
Host: Vernon Barger
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