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HEP/CFT:The Intricacies of String Theory Vacua with Positive Cosmological Constant

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Marco Zagermann, Leibniz University, Hannover
When
25 February 2015 from 2:30 PM to 3:30 PM
Where
339 Davey Laboratory
Contact Name
Murat Gunaydin
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The extra dimensions of string theory may have
important phenomenological implications, even at energy
scales well below the string or the compactification scale.
This includes, in particular, the generic presence of very weakly
interacting scalar fields, moduli and axions, in the 4D low
energy effective field theory, which may play an important role
for many issues in cosmology and astroparticle physics.
The focus of this talk is on de Sitter vacua, i.e. string
compactifications that can model a positive cosmological
constant. I explain the origin of the natural complexities of
such models and discuss the challenges one faces
in some popular approaches. This includes attempts to construct
"classical" de Sitter vacua, as well as the KKLT construction,
whose self-consistency is subject of an ongoing debate.

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