Found 2 result(s)

03.01.2022 (Monday)

String (In)Stability Issues with Broken Supersymmetry

Regular Seminar Augusto Sagnotti (Scuola Normale Superiore and INFN)

at:
14:00 IC
room B1004
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 potentials”, 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.

25.04.2007 (Wednesday)

Some lessons from higher spins

Triangular Seminar Augusto Sagnotti (Pisa)

at:
16:00 KCL
room 2C
abstract: