Theory Seminar (High Energy/Cosmology)

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Events During the Week of February 14th through February 21st, 2021

Monday, February 15th, 2021

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Tuesday, February 16th, 2021

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Wednesday, February 17th, 2021

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Thursday, February 18th, 2021

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Friday, February 19th, 2021

Resolving spacetime singularities in flux compactifications and KKLT
Time: 2:00 pm - 3:00 pm
Place: For zoom link, sign up at:
Speaker: Jakob Moritz, Cornell University
Abstract: I explain how string theory resolves ubiquitous singularities in type IIB flux compactifications (and eventually KKLT de Sitter vacua) via effects that are non-perturbative in the \alpha' expansion of string theory. I will show that these can be understood in detail by mapping them to well known gauge instanton effects in pure 4d N=2 Yang-Mills theory. A perhaps surprising consequence is that the naively 'elementary' D7 brane of type IIB string theory is properly thought of as a bound state of two mutually non-local cosmic defects in six dimensions upon compactification on a curved 4-manifold. Finally, I will argue that the resolution described indicates that KKLT de Sitter vacua can be controlled by a small flux superpotential although the K\"ahler potential may in general receive large corrections which are difficult to compute.
Host: Lars Aalsma
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