Events

Theory Seminar (High Energy/Cosmology)

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Events During the Week of August 21st through August 28th, 2022

Monday, August 22nd, 2022

Interesting Aspects of Nearly Extremal Black Holes
Time: 12:00 pm - 1:00 pm
Place: Chamberlin 5280
Speaker: Upamanyu Moitra, ICTP
Abstract: I will discuss some very interesting aspects of physics one can learn from studying nearly extremal black holes, especially the near-horizon AdS_2 region.
Host: George Wojcik
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Tuesday, August 23rd, 2022

No events scheduled

Wednesday, August 24th, 2022

Two problems for strong CP: Topological quantization and the first postulate of quantum mechanics
Time: 12:00 pm - 1:00 pm
Place: Chamberlin 5280
Speaker: Bjorn Garbrecht, Munich Tech. U.
Abstract: In the path integral quantization of Yang-Mills theory, integer topological sectors follow only when Euclidean time is taken to infinity. This implies that the spacetime volume must be taken to infinity before interfering among the sectors. On the other hand, in canonical quantization, the standard theta-vacua are not properly normalizable without further ado. We revisit the well-known analogy with a point particle on a circle. It is sometimes argued that continuous energy bands corresponding to Bloch states exist for this problem. We show however that the states in these bands exhibit an inconsistent time evolution, unless narrowing the energy band to just one allowed state. From either perspective one can understand why no CP violation is seen in the strong interactions.
Host: George Wojcik
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Thursday, August 25th, 2022

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Friday, August 26th, 2022

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