|
Calendar of Physics Talks Vienna
| Speaker: | Alessandra Gnecchi (CERN) |
| Abstract: | The stability of non-supersymmetric vacua obtained from string theory is receiving a lot of attention due to its implications for the recent generalizations of the Weak Gravity Conjecture. Starting from the classification of supersymmetric AdS7 vacua in type IIA, I will present the study of their non-supersymmetric counterparts. For a large subset of them, perturbative instabilities can be found both from a 7D Supergravity analysis as well as from the study of polarization of the D6 brane action. For the remaining, perturbative stable ones, I will show the existence of a non-perturbative decay channel mediated by an NS5 bubble nucleation.
|
| Date: | Tue, 28.04.2020 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Zoom |
| Contact: | S. Fredenhagen, D. Grumiller, T. Schimannek, I. Lovrekovic |
| O-plane Backreaction and Scale Separation in Type IIA Flux Vacua |
| Speaker: | Daniel Junghans (Heidelberg University) |
| Abstract: | We construct AdS4 flux vacua of type IIA string theory in the supergravity (large volume, small gs) 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-gs limit. Finally, our solutions appear to violate a recent swampland conjecture about an absence o |
| Date: | Thu, 30.04.2020 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | System: call on the group Skype Meeting hep ITP. Please send your Skype contact details to D. Andriot to be added to the Skype group, if you have not done so. |
| Contact: | David Andriot |
|