| Wednesday 24 April 2024 | |
| Events for day: Tuesday 11 May 2021 |
| 14:00 - 15:00 Weekly Seminar HEPCo Group Positivity with Gravity School PHYSICS Abstract: In standard effective field theories, the notion of causality is intrinsically linked with that of subluminality and with a set of positivity constraints to be imposed on the low-energy scattering amplitudes. I will highlight how the presence of gravity leads to a more subtle relation between causality, (sub)luminality and positivity bounds. These considerations are relevant for putting constraints on cosmological and gravitational effective field theories and I will provide explicit criteria to be satisfied so as to ensure causality and a standard high energy completion in gravitational effective field theories. < ... 17:30 - 19:30 Number Theory Webinar Shimura Varieties Modulo p With Many Compact Factors School MATHEMATICS We give several new moduli interpretations of the special fibers of several Shimura varieties over certain prime numbers. As a corollary we obtain that for every prescribed odd characteristic p every bounded symmetric domain possesses quotients by arithmetic subgroups, whose models have good reduction at a prime divisor of p. Zoom Meeting link: https://zoom.us/j/9299700405?pwd=VTM5OW53dWFkbjcxQXBBalhiNWc2dz09 Meeting ID: 929 970 0405 Passcode: 210406 Video: You can see the vi ...
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