Computations in Science Seminars
May
27
Wed 12:15
Matthew Pinson, University of Chicago
e-mail:
Host: Tom Witten
Organizer: Shiladitya Banerjee ()
Signal Transmission through Disordered Hypostatic Materials

A bag of sand is a slightly hypostatic system: the number of constraints is just a little smaller than the number of degrees of freedom. As a result, several linearly independent modes of motion are available at zero energy cost. The question naturally arises: can we use these modes to transmit information from one side of the system to the other? In this talk, I will explain why we cannot. Even though each mode considered on its own spans a large portion of the system, combining the modes yields only a few independent long range modes, and many localised modes. Thus the effective number of free modes seen by any small portion of the system is much smaller than we would have guessed based on Maxwell counting. This provides an unexpected limitation on the perturbations that can be applied, and even most of those that are accessible are not transmitted.

Jun
3
Wed 12:15
Vishal Soni, University of Chicago
e-mail:
Host: William Irvine () *
Organizer: Sayantan Majumdar ()
Geometry of Colloidal Assembly

Understanding how particles come together to form ordered structures is a central goal of material science. Mechanisms which rely on geometric aspects of the system, for example the shape of the constituent particles, often lead to more robust ways of influencing a material structure because they are independent of the chemical details. These geometric influences may enter at the particle scale or at the scale of the underlying environment, for example through the curvature of the substrate. We experimentally studied the 2-D assembly of attractive colloidal particles with varying shapes as well as repulsive spheres inside spatially varying external fields. In each of these cases, we use geometry to gain insight on the resulting structure.

Jun
8
Mon 12:15
Stephan Herminghaus, Max Planck Institute
e-mail:
Host: Tom Witten
Organizer: Ivo Peters ()
Instabilities in microbial mats: Physical fingerprints of early life forms
Jun
17
Wed 12:15
Marilena Loverde, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Jun
22
Mon 12:15
Christophe Clanet, École Polytechnique
e-mail:
Host: Wendy Zhang () *
Sports Physics
Special seminar on Monday - GCIS W301

Physics consists in identifying repeatable sequences in our environment and finding the simplest underlying laws. Here, the environment is Sport. We will first start with sports ballistics and classify the different paths that can be observed according to the symmetry of the "particles". This will allow us to discuss the diversity of trajectories with spheres, the flip properties of shuttlecocks and the stability issues in ski-jumping. The second part will be dedicated to weightlifting. The questions we address are: How does a human lift a weight? Can we use the dynamics of lift as a muscle rheometer?

Jul
1
Wed 12:15
OPEN *
Jul
8
Wed 12:15
Peter Scherpelz and Hosung Seo, University of Chicago
e-mail:
Host: Giulia Galli
Jul
15
Wed 12:15
Bradford Benson, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Jul
22
Wed 12:15
OPEN
Jul
29
Wed 12:15
Shiladitya Banerjee, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Aug
5
Wed 12:15
Radha Ramachandran, Eve Tulbert, University of Chicago, Freedom Games
e-mail:
Aug
12
Wed 12:15
Stephane Perrard, University of Chicago
e-mail:
Host: William Irvine ()
Aug
19
Wed 12:15
Sayantan Majumdar, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Aug
26
Wed 12:15
Kim Weirich, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Sep
30
Wed 12:15
Sarah Cobey, University of Chicago
e-mail:
Host: Michael Rust
Oct
7
Wed 12:15
Zvonimir Dogic, Brandeis University
e-mail:
Host: William Irvine ()
Oct
14
Wed 12:15
Michael Oppenheimer, Princeton
e-mail:
Host: Leo Kadanoff ()
Oct
21
Wed 12:15
Kathleen Stebe, University of Pennsylvania
e-mail:
Host: Leo Kadanoff ()
Oct
28
Wed 12:15
Tom Lubensky, University of Pennsylvania
e-mail:
Host: Leo Kadanoff ()
Nov
4
Wed 12:15
Eric Siggia, Rockefeller University
e-mail:
Host: Greg Voth
Nov
11
Wed 12:15
David Schuster, University of Chicago
e-mail:
Host: Leo Kadanoff ()
Nov
18
Wed 12:15
OPEN
Dec
2
Wed 12:15
OPEN
Dec
9
Wed 12:15
Charles Kane, University of Pennsylvania
e-mail:
Host: Leo Kadanoff ()
Dec
16
Wed 12:15
OPEN
Jan 2016
6
Wed 12:15
OPEN
Jan 2016
13
Wed 12:15
OPEN
Jan 2016
20
Wed 12:15
OPEN
Jan 2016
27
Wed 12:15
OPEN
Feb 2016
3
Wed 12:15
OPEN
Feb 2016
10
Wed 12:15
Mark Bowick, Syracuse University
e-mail:
Host: William Irvine ()
Feb 2016
17
Wed 12:15
OPEN
Feb 2016
24
Wed 12:15
OPEN
Mar 2016
2
Wed 12:15
OPEN
Mar 2016
9
Wed 12:15
OPEN
Mar 2016
16
Wed 12:15
OPEN