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Events on Thursday, April 29th, 2021

Cosmology Journal Club
Time: 12:00 pm - 1:00 pm
Abstract: 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

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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Searching for new physics during gravitational waves propagation
Time: 2:30 pm
Place: online
Speaker: Leïla Haegel, Postdoctoral fellow at University of Paris & Swiss National Science Foundation
Abstract: The direct detection of gravitational waves by the LIGO-Virgo collaboration in 2015 opened a new channel to probe the existence of new physics. The existence of new fields are predicted in several alternative theories of gravitation, including low-energy effects of a possible quantum theory of gravity. The presence of such fields can induce a dispersion of the gravitational radiation, impacting its morphology and the apparent distance of the source. This talk reviews several constraints on new physics during the propagation of gravitational waves, including massive gravity, multi messenger signals and derivations in the Standard Model Extension effective field theory. Join Zoom Meeting Meeting ID: 944 8467 4148 Passcode: 016617 One tap mobile +13126266799,,94484674148#,,,,*016617# US (Chicago) +19292056099,,94484674148#,,,,*016617# US (New York)
Host: Tianlu Yuan
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Astronomy Colloquium
Dust in galaxies: extinction, attenuation and emission
Time: 3:30 pm - 5:00 pm
Place: Virtual Zoom meeting - See Abstract, Coffee and Tea 3:30pm, Talk begins 3:45 PM
Speaker: Samir Salim, Indiana University
Abstract: I will review some recent results regarding the effect of the cosmic dust on the light we receive from galaxies. I will specifically discuss how the dust attenuation laws in galaxies are much more diverse than previously thought, emphasizing the need to try to understand the root causes of this diversity, especially since the incorrect assumptions about the dust properties result in systematic and random errors in the derivation of galaxy properties. I will also highlight that the complete understanding of the more complex question of dust attenuation is predicated on resolving some fundamental puzzles regarding the more basic phenomenon of dust extinction. I will also present some new results regarding the dust emission in the IR in the context of the upcoming JWST launch. Zoom Link:

Host: Snezana Stanimirovic
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