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Events on Friday, October 2nd, 2020

Graduate Introductory Seminar (Physics 701)
Astrophysics and Cosmology Experiment
Time: 12:05 pm - 12:55 pm
Place: BBCollaborate
Speaker: Peter Timbie, UW Madison Department of Physics
Host: Sridhara Dasu
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Theory Seminar (High Energy/Cosmology)
Gradient effects on false vacuum decay in gauge theory
Time: 2:00 pm - 3:00 pm
Place: For zoom link, sign up at:
Speaker: Juan S. Cruz, Technical University Munich
Abstract: We study false vacuum decay for a gauged complex scalar field in a polynomial potential with nearly degenerate minima. Radiative corrections to the profile of the nucleated bubble as well as the full decay rate are computed in the planar thin-wall approximation using the effective action. This allows to account for the inhomogeneity of the bounce background and the radiative corrections in a self-consistent manner. In contrast to scalar or fermion loops, for gauge fields one must deal with a coupled system that mixes the Goldstone boson and the gauge fields, which considerably complicates the numerical calculation of Green's functions. In addition to the renormalization of couplings, we employ a covariant gradient expansion in order to systematically construct the counterterm for the wave-function renormalization. The result for the full decay rate however does not rely on such an expansion and accounts for all gradient corrections at the chosen truncation of the loop expansion. The ensuing gradient effects are shown to be of the same order of magnitude as non-derivative one-loop corrections.
Host: Lars Aalsma
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Department Coffee Hour
Time: 3:30 pm - 4:30 pm
Abstract: Guest speaker Andrea Lawson from the Employee Assistance Office (EAO) will join us for a facilitated dialogue about mental health and taking care of ourselves during the pandemic. EAO serves faculty, staff, and graduate assistants. Andrea Lawson is an LCSW with 13 years of experience in mental health on university campuses. Most of her career has been supporting student mental health and wellbeing as a clinician and administrator, and she is pleased to join the Employee Assistance Office at UW–Madison to shift focus to the needs of employees for personal and work-related concerns. Her areas of interest are in management consulting, wellness, inclusion, mental health, interpersonal dynamics, graduate students, groups and identity development. She seeks to attend to intersecting identities and power dynamics and to cultivate space where clients can be their full selves.
Host: Department
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