This Week at Physics

 
<< March 2017 >>
 
 >>
 >>
 >>
 >>
 >>
Sun Mon Tue Wed Thu Fri Sat
   1   2   3   4 
 5   6   7   8   9   10   11 
 12   13   14   15   16   17   18 
 19   20   21   22   23   24   25 
 26   27   28   29   30   31   
 
Add an Event

This Week at Physics

<< Fall 2016 Spring 2017 Fall 2017 >>
Subscribe to receive email announcements of events

Events During the Week of March 26th through April 2nd, 2017

Monday, March 27th, 2017

Plasma Physics (Physics/ECE/NE 922) Seminar
Plasma Shocks
Time: 12:00 pm
Place: 2317 Engineering Hall
Speaker: Dr. Paul Drake, University of Michigan, USA
Add this event to your calendar

Tuesday, March 28th, 2017

Chaos & Complex Systems Seminar
2016 Polling in Nation and State: A scorecard
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Charles Franklin, Law and Public Policy and Director of the Marquette University Law School Poll
Abstract: How did the pre-election polls of 2016, at both national and state levels, perform? What did we learn about the dynamics of the campaign and the issues affecting public polling? How accurate were the polls and were some methods better than others?
Host: Clint Sprott
Add this event to your calendar

"Physics Today" Undergrad Colloquium (Physics 301)
Neutrino astronomy with IceCube
Time: 1:20 pm
Place: 2241 Chamberlin Hall
Speaker: Albrecht Karle, UW Madison Department of Physics
Host: Wesley Smith
Add this event to your calendar

Faculty Candidate Seminar
How to find dark matter
Time: 2:30 pm
Place: 4274 Chamberlin Hall
Speaker: Dr. Bjoern Penning, University of Bristol
Abstract: Dark Matter (DM) is a long standing puzzle in fundamental physics and the goal of a diverse research program. I will review the evidence for DM and how to search for it. Underground and astrophysical searches attempt to detect DM particles in the cosmos directly or by searching for their decay products while particle colliders attempt to produce DM in the laboratory. Each of these detection methods probe different parts of the parameter space with complementary sensitivity in mass, interaction type, and uncertainties. I will show the connection between these searches, theoretical developments that connect their search strategies and how an interdisciplinary effort can probe the entire natural phase space in the near term future.
Add this event to your calendar

Theory Seminar (High Energy/Cosmology)
Cosmology from Non-Linear Weak Lensing
Time: 3:30 pm
Place: 5280 Chamberlin Hall
Speaker: Zoltan Haiman, Columbia Univ
Abstract: Several large astronomical surveys have either been proposed or are underway to measure weak lensing distortions of up to a billion galaxies. This will allow accurate measurement of the lensing shear field in the small-scale, non-linear regime, where non-Gaussian features can contain significant cosmological information. I will report on results from a large suite of ray-tracing N-body simulations in different cosmologies, and discuss constraints from the number counts of lensing peaks (i.e. from the number of maxima as a function of their height), and from other statistics probing the non-linear
regime. These statistics can tighten cosmological constraints by a factor of two, compared to using two-point statistics alone. A recent application of this approach to the CFHTLenS survey has confirmed this for the parameters (Omega_m,sigma_8). I will comment on the theoretical and simulation challenges for larger lensing surveys in
the future.
Host: Joshua Berger
Add this event to your calendar

Wednesday, March 29th, 2017

No events scheduled

Thursday, March 30th, 2017

NPAC (Nuclear/Particle/Astro/Cosmo) Forum
tbd
Time: 2:30 pm
Place: 5280 Chamberlin Hall
Speaker: Antonia Hubbard, Northwestern
Abstract: tbd
Host: Kim Palladino
Add this event to your calendar

Astronomy Colloquium
"Towards understanding the inefficiency of star formation in galaxies"
Time: 3:30 pm
Place: 4421 Sterling Hall, Coffee and Cookies 3:30 pm, Talk begins 3:45 pm
Speaker: Andrey Kravtsov, The University of Chicago
Abstract: One of the long-standing puzzles of galaxy formation is the global inefficiency with which galaxies convert baryonic matter available to them into stars. This inefficiency is manifested in 1) the fact that ratio of baryon mass observed within galaxies to the total inferred mass of their host halos is much smaller than the universal baryon fraction and 2) the fact that galaxies convert their observed gas into stars on ~2-10 Gyr time scale (gas depletion time), which is much longer than any dynamical time scale within galaxies.

I will review recent progress in galaxy formation simulations due to improvements in treatment of stellar feedback and star formation, which sheds light into the 1st aspect of inefficiency. I will present a new model, in which local star formation efficiency is modelled "on the fly" using a turbulence-based subgrid model based on results of high-resolution simulations of molecular clouds. The model predicts a wide variation of star formation efficiency per free fall time at odds with the usual assumption of constant efficiency. At the same time, our model predicts distribution of star formation rates in broad agreement with observations of both local and resolved extragalactic GMCs. I will show that with realistic implementation of stellar feedback this modelling can reproduce the basic properties of star formation and the Kennicutt-Schmidt relation in galaxies, such as the Milky Way. Finally, using insights from such simulations I will present a simple model explaining why star formation in galaxies is inefficient and depletion times are long.
Host: Astronomy Department and Physics
Add this event to your calendar

Friday, March 31st, 2017

Physics Department Colloquium
tbd
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Katherine Freese, University of Michigan
Abstract: tbd
Host: Susan Coppersmith
Add this event to your calendar
©2013 Board of Regents of the University of Wisconsin System