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DTSTAMP:20260919T163537
DTSTART;TZID=America/Detroit:20260925T150000
DTEND;TZID=America/Detroit:20260925T160000
SUMMARY:Workshop / Seminar:Derived categories in algebraic geometry
DESCRIPTION:Derived categories have found interest in algebraic geometry for two reasons: 1) as a tool for cohomological calculations and derived functors\, and 2) as an interesting invariant in its own right. I will briefly survey both perspectives.
UID:152470-21913791@events.umich.edu
URL:https://events.umich.edu/event/152470
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 2866
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260921T173437
DTSTART;TZID=America/Detroit:20260925T150000
DTEND;TZID=America/Detroit:20260925T160000
SUMMARY:Lecture / Discussion:HET Seminar | Birefringence and Axiogenesis
DESCRIPTION:Recent analyses of Planck and ACT CMB data report a 2–4σ hint of isotropic cosmic birefringence of β ≈ 0.3°. This corresponds to a parity-violating rotation of CMB photon polarization and points to new physics beyond the Standard Model. We demonstrate that cosmic birefringence and the baryon asymmetry can be simultaneously explained by the rotation of an axion in field space. In this axiogenesis framework\, the axion rotation generates the baryon asymmetry through electroweak sphalerons\, while such a rotation can arise in the early universe from explicit U(1) symmetry breaking expected from quantum gravity. The minimal models predict the correct sign of β based on the observed baryon asymmetry\, as well as a period of matter and kination domination ending around a temperature of 3-50 MeV that makes the models falsifiable through future astrophysical probes and can lead to unique gravitational-wave signatures.
UID:150863-21910327@events.umich.edu
URL:https://events.umich.edu/event/150863
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Science,Talk,Physics,Lecture,High Energy Theory Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
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