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Events During the Week of October 11th through October 18th, 2020

Monday, October 12th, 2020

Plasma Physics (Physics/ECE/NE 922) Seminar
A Novel Theory of Particle Acceleration at Shocks
Time: 12:00 pm
Place: Zoom Meeting
Speaker: Damiano Caprioli, Assistant Professor University of Chicago
Abstract: Diffusive shock acceleration (DSA) is a prominent energization mechanism involved in the origin of Galactic cosmic rays and in producing the multi-wavelength emission in astrophysical systems such as novae, supernova remnants (SNRs), and galaxy clusters.
I outline how ab-initio kinetic simulations of non-relativistic shocks help unraveling the very nature of this process. In particular, I discuss the tension between the standard theory of efficient DSA and the steep spectra inferred in multi-wavelength observations of SNRs, stressing the need to go beyond the canonical prediction that strong shocks produce particles with energy spectrum ~E^-2, or harder. Finally, I introduce CRAFT (Cosmic Ray Analytical Fast Tool), a quick and versatile package for calculating spectra of accelerated particles in non-relativistic shocks, along with their radio to gamma-ray non-thermal emission.

PAUL W TERRY is inviting you to a scheduled Zoom meeting.

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Meeting ID: 991 5610 7574
Passcode: 883688

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Join by H.323 (US West) (US East) (India Mumbai) (India Hyderabad) (Amsterdam Netherlands) (Germany) (Australia) (Singapore) (Brazil) (Canada) (Japan)
Meeting ID: 991 5610 7574
Passcode: 883688
Host: Paul Terry
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Tuesday, October 13th, 2020

PGSC phenomeNal Open Graduate Seminar
Time: 2:30 pm
Speaker: Brent Mode, Physics Graduate Student
Abstract: Developing the Prototype Schwarzschild-Couder Telescope for the Cherenkov Telescope Array

As they speed through the Earth’s atmosphere, very high energy gamma rays have the potential to collide with an air molecule, setting off cascades of particle interactions which are detectable from a characteristic blue glow called Cherenkov light. While these interactions occur on much too short a time scale and produce light too faint for the human eye to observe, a breadth of science analyses become possible using a specially designed telescope with a powerful camera. My work at UW-Madison is focused on the development and commissioning of one such camera for the prototype Schwarzschild-Couder Telescope (pSCT) as part of the upcoming Cherenkov Telescope Array. I will describe the specifications of this novel instrument, the contributions I’ve made to the pSCT’s development, and touch on the science that will be possible once the pSCT is completed.
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Council Meeting
Time: 4:00 pm
Place: Virtual
Speaker: Sridhara Dasu, UW-Madison
Host: Sridhara Dasu, Department Chair
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Wednesday, October 14th, 2020

Wisconsin Quantum Institute
CQE Seminar Series: TBD
Time: 11:00 am
Place: Virtual; contact for login info
Speaker: Marco Pistoia, JPMorgan Chase
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Department Meeting
Time: 12:15 pm
Speaker: Sridhara Dasu, Department Chair, UW-Madison
Host: Sridhara Dasu, Department Chair
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Academic Calendar
Masters in Learning Analytics Webinar
Time: 4:00 pm
Abstract: Informational session to learn about the program. Learn more about the Department of Educational Psychology's new online graduate program. The session will cover program logistics, curriculum details, tips for applying, and will open to any individual questions. Note: Applicants who attend the webinar will have their $75 application fee waived. For more information on the program, visit CONTACT: 858-337-5858, URL:
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Academic Calendar
Online - Program Overview: Masters in Learning Analytics Program
Time: 4:00 pm
Abstract: Interested in using data to make an impact on teaching, learning and policy in the world of education? Join program director Julia Rutledge and enrollment coach Pat Walsh to get more information about the Learning Analytics master's program including curriculum, application process and potential career paths. URL: ONLINE EVENT:
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Thursday, October 15th, 2020

Cosmology Journal Club
Time: 12:00 pm
Abstract: Cosmology Journal Club is back! We will be having virtual meetings this semester.

Each week, we start with a couple scheduled 15 minute talks about one's research, or an arXiv paper. The last 30 minutes will typically be open to the group for anyone to discuss an arXiv paper.

All are welcome and all fields of cosmology are appropriate.

Contact Ross Cawthon, cawthon@wisc, for more information.

Zoom info
Meeting ID: 93592708053, passcode: cmbadger

Or click:
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Lepton flavor violating Higgs boson decays
Time: 3:00 pm
Place: Zoom:
Speaker: Prasanna Siddireddy, University of Notre Dame
Host: Sridhara Dasu
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Astronomy Colloquium
` JWST status as of 2020, and some of its first Science Programs: Time Domain Science, Cluster Lensing \& Caustic Transits ''
Time: 3:30 pm
Place: Zoom meeting(see Abstract ) Coffee and tea 3:30pm, Talk 3:45 PM
Speaker: Rogier Windhorst, Regents' and Foundation Professor, JWST Interdisciplinary Scientist, Arizona State
Abstract: In this talk, I will give the 2020 summary of the 6.5 meter James Webb Space Telescope (JWST), the near--mid-IR sequel to both Hubble and Spitzer. All hardware has been built, and is in the final stages of testing for its launch scheduled in October 2021. Next, I will review some of the early science that JWST plans do starting in 2022, inspired by Hubble Wide Field Camera 3.

JWST can do unique time domain science to 29 mag in the North Ecliptic Pole (NEP)Time-Domain Field (TDF) located in JWST's (and HST's) northern Continuous Viewing Zone: a unique clean region devoid of bright foreground stars with low Galactic extinction. JWST can observe most targets for 2x2 months per year, including the well known HST and Spitzer deep fields, but can observe the NEP TDF at all times, so that NIRISS parallel grism spectra will always cover NIRCam 0.8-5 micron images 180 days later. Since 2016, the JWST TDF has been observed from space and the ground, from hard X-rays to long wavelength radio. The NEP TDF will search for and monitor high redshift transients: SNe at z>5, weak Active Galactic Nuclei, Galactic brown dwarf atmospheres, and provide proper motions of nearby brown dwarfs, low-mass stars, and ultracool white dwarfs to 29 mag, and perhaps some Inner Oort Cloud Objects.

The search for first galaxies at redshifts z=9-11 (cosmic age ~0.5 billion yrs) in Hubble's Deep Fields has shown what combination of area, depth, and wavelength coverage is needed for JWST to detect a sufficient number of First Light objects. Since the Schechter luminosity function likely drops rapidly in amplitude atz>7-8, gravitational lensing by the best rich foreground galaxy clusters is essential to maximize the number of First Light objects (z ~ 7-17) detected with JWST. To address the observability of objects in the First Light epoch, I willuse panchromatic Extragalactic Background Light to to constrain the integrated near-IR surface brightness (SB) that may come from Population III stars and their stellar-mass black hole (BHs) accretion disks.

The physical properties of zero-metallicity Pop III stars from MESA stellar evolution models through helium depletion, and BH accretion disk models at z>7 provide an estimate of the number of caustic transits behind lensing clusters that JWST may detect for both these objects. Typical caustic magnifications can be 10^4-10^5x, with rise times of hours and decline times of z~<0.5 year for cluster transverse velocities of v_T<~1000 km/s. Microlensing by intracluster-medium objects can modify transit magnifications, but lengthen visibility times. To observe Pop III caustic transits directly with JWST may require monitoring 3-30 lensing clusters to AB<29 mag for <5-10 years.

Zoom Meeting information:

Meeting ID: 817 5005 5728
Passcode: 000018
Host: Professor Amy Barger UW Astronomy
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Friday, October 16th, 2020

Graduate Introductory Seminar (Physics 701)
Probing the early universe with new data and new computational methods
Time: 12:05 pm
Place: BBCollaborate
Speaker: Moritz Munchmeyer, UW Madison Department of Physics
Host: Sridhara Dasu
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Theory Seminar (High Energy/Cosmology)
Islands, cosmology, and baby universes
Time: 2:00 pm
Place: For zoom link, sign up at:
Speaker: Arjun Kar, University of British Columbia
Abstract: I will present a "minimal" model of black hole evaporation which uses replica wormholes and the island formula to recover the unitary Page curve. This model combines advantageous features of previous models of evaporation to give a more flexible formalism. As an example of its flexibility, I will discuss its application to de Sitter black holes, where the island formula yields results which seem to be in tension with some old expectations about quantum gravity in de Sitter space. Finally, time permitting, I will describe more general implications of wormholes in the gravitational path integral by extending a toy model of Marolf and Maxfield to include spin structure. The inclusion of spin structure presents interesting complications when constructing the baby universe Hilbert space, as well as the dual of a single boundary theory.
Host: Lars Aalsma
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Department Coffee Hour
Time: 3:30 pm
Abstract: Join us weekly for an informal virtual coffee hour! Catch up with others in the department, tell us how things are going, and impress everyone with your Zoom background skills. Coffee Hour is open to any and all faculty, staff, and students in the department. Sometimes we have a topic, and we'll try to get that topic posted here in advance or sent out by email before each coffee hour.
Host: Department
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