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Events on Friday, February 19th, 2021

Graduate Program Event
PhD Prospective Student VIRTUAL Visit Day
Time: 12:00 am
Place: Virtual
Speaker: PhD Program Faculty & Graduate Students, UW-Madison, Department of Physics
Abstract: All admitted Ph.D. students for Fall 2021 will be invited for prospective student virtual visit days. Graduate students and faculty will receive more information as the dates approach.
Host: Michelle Holland, Graduate Program Coordinator
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Theory Seminar (High Energy/Cosmology)
Resolving spacetime singularities in flux compactifications and KKLT
Time: 2:00 pm
Place: For zoom link, sign up at:
Speaker: Jakob Moritz, Cornell University
Abstract: I explain how string theory resolves ubiquitous singularities in type IIB flux compactifications (and eventually KKLT de Sitter vacua) via effects that are non-perturbative in the \alpha' expansion of string theory. I will show that these can be understood in detail by mapping them to well known gauge instanton effects in pure 4d N=2 Yang-Mills theory. A perhaps surprising consequence is that the naively 'elementary' D7 brane of type IIB string theory is properly thought of as a bound state of two mutually non-local cosmic defects in six dimensions upon compactification on a curved 4-manifold. Finally, I will argue that the resolution described indicates that KKLT de Sitter vacua can be controlled by a small flux superpotential although the K\"ahler potential may in general receive large corrections which are difficult to compute.
Host: Lars Aalsma
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Searching for UHE- photons at the Pierre Auger Observatory: a two variable approach exploiting the air-shower Universality
Time: 2:00 pm
Place: Zoom meeting
Speaker: Pierpaolo Savina, Università del Salento, Italy and Université Paris-Saclay, France
Abstract: Join Zoom Meeting:
Meeting ID: 934 2494 5316
Passcode: 762367
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Host: Lu Lu
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Department Coffee Hour
Department Coffee Hour (Virtual)
Time: 3:30 pm
Place: Virtual (see abstract for connection info)
Abstract: Topic: Department Coffee Hour
Time: Jan 29, 2021 03:30 PM Central Time (US and Canada)
Every week on Fri, until May 14, 2021, 16 occurrence(s)
Jan 29, 2021 03:30 PM
Feb 5, 2021 03:30 PM
Feb 12, 2021 03:30 PM
Feb 19, 2021 03:30 PM
Feb 26, 2021 03:30 PM
Mar 5, 2021 03:30 PM
Mar 12, 2021 03:30 PM
Mar 19, 2021 03:30 PM
Mar 26, 2021 03:30 PM
Apr 2, 2021 03:30 PM
Apr 9, 2021 03:30 PM
Apr 16, 2021 03:30 PM
Apr 23, 2021 03:30 PM
Apr 30, 2021 03:30 PM
May 7, 2021 03:30 PM
May 14, 2021 03:30 PM
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Host: Climate and Diversity Committee
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