Friday, March 3, 2017 - 3:00pm to 4:00pm  ·  Colloquium
Charles Reichhardt, Los Alamos National Laboratory

Abstract: There has been tremendous growth in studying nonequilibrium systems in which the individual units are internally driven and are self-mobile. Such dynamics can effectively describe certain biological systems such as run-and-tumble bacteria or crawling cells, as well as non-biological systems such as self-driven colloids or artificial swimmers. These systems are now being grouped into a new class of matter called active matter.  They exhibit a wealth of novel nonequilibrium behaviors, such as clustering, flocking, and phase separation.

Monday, February 20, 2017 - 12:00pm to 1:00pm  ·  Colloquium
Dr. Dustin Keller

Abstract: Nuclear physics experiments using a solid polarized target attempt to extract polarized observables with optimal precision. An introduction is given to the process of polarizing bulk materials specific to the requirements of fixed target scattering experiments. Some examples of the recent developments in the technology and techniques using DNP solid polarized targets are also presented.

Thursday, February 16, 2017 - 4:00pm to 5:00pm  ·  Colloquium
Dr. Nadia Fomin

Abstract: Modern neutron sources provide extraordinary opportunities to study a wide variety of physics topics, including the physical system of the neutron itself. One of the processes under the microscope, neutron beta decay, is an archetype for all semi-leptonic charged-current weak processes. Precise measurements of the correlation parameters in neutron beta decay as well as the neutron lifetime itself are required for tests of the Standard Model and for searches of new physics.

Tuesday, February 14, 2017 - 1:00pm to 2:00pm  ·  Colloquium
Dr. Elena Long, UNH

Abstract: Since the discovery of the proton in 1917, physicists have been studying its properties: Asking questions about the internal structure and external phenomena of this basic piece of matter. This past century has been working to build an understanding that begins at the most fundamental quark level, builds up to protons and neutrons, and describes how they come together to form the atomic nuclei that make up everything we see around us.

Monday, February 6, 2017 - 12:10pm to 1:00pm  ·  Colloquium
Dr. Philip Ilten

Abstract: The nature of dark matter cannot be explained by the standard model of particle physics and remains a prominent open question in physics.

With no dark matter signals found at the LHC, interest has been renewed in treating dark matter as a hidden sector with a weak connection to the standard model. Here I will explore searching for the dark photon, a possible portal between dark matter and the standard model.


Thursday, February 2, 2017 - 4:10pm to 5:10pm  ·  Colloquium
Dr. William East, Perimeter Institute for Theoretical Physics

Abstract: With the groundbreaking detections of gravitational waves from merging black holes by LIGO, we have entered the era where we can actually observe the dynamics of strongly curved spacetime originally predicted by Einstein.  Going hand in hand with this, there has been a renaissance in theoretical and computational tools we use to understand and interpret the dynamics of gravity and matter in this regime.  I will describe some of the rich behavior ex

Monday, January 30, 2017 - 3:40pm to 4:40pm  ·  Colloquium
Dr. Vasileios Paschalidis, Princeton University

Abstract: The LIGO and VIRGO collaborations recently announced the first direct detections of gravitational waves (GW) corresponding to the inspiral and merger of stellar-mass black hole-black hole (BHBH) binaries in vacuum. In addition to GWs from other vacuum BHBH binaries, GWs from compact binaries involving neutron stars are also expected to be detected in the next few years. Moreover, distinct observable electromagnetic (EM) radiation may accompany these GWs.

Thursday, January 26, 2017 - 4:10pm to 5:10pm  ·  Colloquium
Dr. Alexander Tchekhovskoy, UC Berkeley

Abstract: Black holes are responsible for a wide range of astrophysical phenomena. They devour stars, emit gravitational waves, eject relativistic jets, affect star formation and galaxy evolution, and enrich the Universe with heavy elements. I will discuss how global general relativistic magnetized fluid dynamics numerical simulations allow us to use this activity to quantitatively probe strong-field gravity and constrain black hole physics in a wide range of astrophysical systems. I will finish by making connections to my future research plans.

Monday, January 23, 2017 - 2:30pm to 3:30pm  ·  Colloquium
Dr. Francois Foucart, Lawrence Berkeley National Laboratory

Abstract: Black holes and neutron stars are extraordinary astrophysical laboratories. They allow us to test the laws of gravity and nuclear physics in extreme environments which cannot be reproduced on Earth. In this talk, I will discuss efforts to model these compact objects in two classes of astrophysical systems: mergers of black hole-neutron star and neutron star-neutron star binaries, and accretion disks around supermassive black holes. The first are powerful sources of gravitational waves, and emit bright electromagnetic transients.

Friday, December 9, 2016 - 4:00pm  ·  Colloquium
Prof. Oleg Tchernyshyov, The Johns Hopkins University

Magnets host a variety of solitons: domain walls, vortices, and skyrmions, to name a few. Protected by their nontrivial topology, these solitons can be used for storing and processing information. This motivates us to build economic, yet realistic models of soliton dynamics in magnets. I will review the behavior of magnetic solitons in one, two, and three dimensions.