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High Energy Theory Seminar

Friday, August 21, 2020
11:00am to 12:00pm
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O-plane Backreaction and Scale Separation in Type IIA Flux Vacua
Daniel Junghans, Heidelberg University,

We construct AdS_4 flux vacua of type IIA string theory in the supergravity
(large volume, small g_s) regime, including the backreaction of O6-planes.
Our solutions are the localized versions of the smeared solutions on
Calabi-Yau orientifolds studied by DeWolfe, Giryavets, Kachru and Taylor and
in other works. We find that the O-plane backreaction in these solutions
generates warping, a varying dilaton, non-closed RR field strengths and
internal curvature. Just like their smeared counterparts, the localized
solutions admit stabilized moduli, a parametric control over string
corrections and a parametric separation between the AdS and KK scales. Our
explicit expressions furthermore make precise the common lore that smeared
solutions should approximate the exact ones in the large-volume, small-g_s
limit. Finally, our solutions appear to violate a recent swampland
conjecture about an absence of scale separation in supersymmetric AdS vacua.
We make a simple observation explaining why this happens in these solutions
in contrast to most other AdS solutions in string theory.

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