Triangle Seminars
Monday, 3 Jan 2022
String (In)Stability Issues with Broken Supersymmetry
Augusto Sagnotti
(Scuola Normale Superiore and INFN)
Abstract:
I shall review some key features of the three ten-dimensional string models with broken supersymmetry that are free of tachyonic modes. Their leading back-reactions are runaway “tadpole potentialsâ€, which have important effects on their ambient spacetimes. When these are explored in detail within the low-energy effective theory, some surprising features emerge:
·Tadpole potentials can drive interesting spontaneous compactifications;
·In Cosmology, they can lead to the peculiar “climbing scenario†for fast-to-slow-roll transitions.
Puzzling instabilities typically accompany broken supersymmetry in String Theory. However, they are absent in the former setting, and point to a mere breakdown of isotropy in the latter, which resonates with the very emergence of compact dimensions. I shall address these issues, trying to emphasize potential lessons and some key open questions.
I shall review some key features of the three ten-dimensional string models with broken supersymmetry that are free of tachyonic modes. Their leading back-reactions are runaway “tadpole potentialsâ€, which have important effects on their ambient spacetimes. When these are explored in detail within the low-energy effective theory, some surprising features emerge:
·Tadpole potentials can drive interesting spontaneous compactifications;
·In Cosmology, they can lead to the peculiar “climbing scenario†for fast-to-slow-roll transitions.
Puzzling instabilities typically accompany broken supersymmetry in String Theory. However, they are absent in the former setting, and point to a mere breakdown of isotropy in the latter, which resonates with the very emergence of compact dimensions. I shall address these issues, trying to emphasize potential lessons and some key open questions.
Posted by: IC
Thursday, 6 Jan 2022
Journal Club on Non-Invertible Duality Defects in 3+1 Dimensions
Rajath Radhakrishnan
(QMUL)
Abstract:
Discussion of https://arxiv.org/pdf/2111.01139.pdf and https://arxiv.org/pdf/2111.01141.pdf. Part of new "London TQFT Journal Club" series at QMUL, please visit https://london-tqft.vercel.app to register for this and future events; some of these future meetings will be more like standard talks with speakers discussing their own work, while some will be–like this meeting–a more traditional journal club event. (Now on Zoom instead!)
Discussion of https://arxiv.org/pdf/2111.01139.pdf and https://arxiv.org/pdf/2111.01141.pdf. Part of new "London TQFT Journal Club" series at QMUL, please visit https://london-tqft.vercel.app to register for this and future events; some of these future meetings will be more like standard talks with speakers discussing their own work, while some will be–like this meeting–a more traditional journal club event. (Now on Zoom instead!)
Posted by: QMW