Happening @ Michigan https://events.umich.edu/group/4286/rss RSS Feed for Happening @ Michigan Events at the University of Michigan. HET Seminar | What's Done Cannot Be Undone: Non-Invertible Symmetries (March 29, 2024 3:00pm) https://events.umich.edu/event/116879 116879-21838139@events.umich.edu Event Begins: Friday, March 29, 2024 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

In massless QED, we find that the classical U(1) chiral symmetry is not completely broken by the Adler-Bell-Jackiw anomaly. Rather, it is resurrected as a generalized global symmetry labeled by the rational numbers. Intuitively, this new global symmetry in QED is a composition of the naive axial rotation and a fractional quantum Hall state. The conserved symmetry operators do not obey a group multiplication law, but a non-invertible fusion algebra. We further generalize our construction to QCD, and show that the neutral pion decay can be derived from a matching condition of the non-invertible global symmetry.

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Lecture / Discussion Tue, 27 Feb 2024 09:38:16 -0500 2024-03-29T15:00:00-04:00 2024-03-29T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
HET Brown Bag Seminar | Cryptographic Censorship (April 3, 2024 1:00pm) https://events.umich.edu/event/117229 117229-21838852@events.umich.edu Event Begins: Wednesday, April 3, 2024 1:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

The classical formulation of the weak cosmic censorship conjecture (WCCC) – the statement that singularities resulting from gravitational collapse are generically hidden behind event horizons – is most probably false. However, I will argue that there is compelling evidence that some version of it should be true in quantum gravity. Working towards a quantum gravitational formulation of the WCCC, I will prove “Cryptographic Censorship”, a theorem that provides a general condition for the formation of event horizons in AdS/CFT: sufficiently (pseudo)random boundary dynamics. I will also provide a classification of sizes of singularities, and show that “large”, “classical” singularities – the ones that the WCCC should rule out – are compatible with sufficiently (pseudo)random dynamics. Thus, if such singularities are indeed described by (pseudo)random dynamics, then they cannot exist in the absence of event horizons.

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Lecture / Discussion Tue, 26 Mar 2024 12:26:07 -0400 2024-04-03T13:00:00-04:00 2024-04-03T14:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
HET Seminar | Recent developments in N=4 Yang-Mills Amplitudes (April 5, 2024 3:00pm) https://events.umich.edu/event/111198 111198-21842585@events.umich.edu Event Begins: Friday, April 5, 2024 3:00pm
Location:
Organized By: Leinweber Center for Theoretical Physics

The most important experimental probes of fundamental physics involve
the scattering of elementary particles. Over the years we have seen
significant progress in understanding the properties of scattering
amplitudes and in our ability to carry out new computations both for
theoretical and phenomenological purposes. I will overview some recent
developments in N=4 Yang-Mills amplitudes.

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Lecture / Discussion Sun, 25 Feb 2024 21:01:54 -0500 2024-04-05T15:00:00-04:00 2024-04-05T16:00:00-04:00 Leinweber Center for Theoretical Physics Lecture / Discussion
HET Brown Bag Seminar | (April 10, 2024 1:00pm) https://events.umich.edu/event/117230 117230-21838853@events.umich.edu Event Begins: Wednesday, April 10, 2024 1:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

TBD

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Lecture / Discussion Tue, 16 Jan 2024 12:30:58 -0500 2024-04-10T13:00:00-04:00 2024-04-10T14:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory
Leinweber Center for Theoretical Physics Public Lecture | Are we alone in the universe? (April 11, 2024 7:00pm) https://events.umich.edu/event/120190 120190-21844206@events.umich.edu Event Begins: Thursday, April 11, 2024 7:00pm
Location: Rackham Graduate School (Horace H.)
Organized By: Leinweber Center for Theoretical Physics

After decades of searching, scientists have still found no evidence of extraterrestrial civilizations, or indeed of any life beyond Earth. So are we looking for the wrong thing in the wrong place? Is the transition from non-life to life easy and widespread, or a chemical fluke? Might there be new physics lurking in living matter? The answers to these questions affect where we might look for a second genesis. Rather than pinning our hopes on a message from ET, we need to broaden the search for general ‘biosignatures’ and ‘technosignatures’ in the solar system and beyond.

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Lecture / Discussion Thu, 14 Mar 2024 12:45:45 -0400 2024-04-11T19:00:00-04:00 2024-04-11T20:00:00-04:00 Rackham Graduate School (Horace H.) Leinweber Center for Theoretical Physics Lecture / Discussion Rackham Graduate School (Horace H.)
HET Seminar | (April 12, 2024 3:00pm) https://events.umich.edu/event/117228 117228-21838851@events.umich.edu Event Begins: Friday, April 12, 2024 3:00pm
Location: West Hall
Organized By: Leinweber Center for Theoretical Physics

TBD

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Lecture / Discussion Wed, 06 Mar 2024 13:42:48 -0500 2024-04-12T15:00:00-04:00 2024-04-12T16:00:00-04:00 West Hall Leinweber Center for Theoretical Physics Lecture / Discussion West Hall
HET Brown Bag Seminar | (April 17, 2024 1:00pm) https://events.umich.edu/event/117231 117231-21838854@events.umich.edu Event Begins: Wednesday, April 17, 2024 1:00pm
Location: Randall Laboratory
Organized By: Leinweber Center for Theoretical Physics

TBD

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Lecture / Discussion Tue, 16 Jan 2024 12:32:38 -0500 2024-04-17T13:00:00-04:00 2024-04-17T14:00:00-04:00 Randall Laboratory Leinweber Center for Theoretical Physics Lecture / Discussion Randall Laboratory