Events on Friday, February 19th, 2021
- Graduate Program Event
- PhD Prospective Student VIRTUAL Visit Day
- 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
- Theory Seminar (High Energy/Cosmology)
- Resolving spacetime singularities in flux compactifications and KKLT
- Time: 2:00 pm - 3:00 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
- 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 - 2:40 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
Find your local number: - Host: Lu Lu
- Department Coffee Hour
- Department Coffee Hour (Virtual)
- Time: 3:30 pm - 4:30 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)
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- Host: Climate and Diversity Committee