Tuesday, July 16, 2019 - 1:00pm to 2:00pm  ·  Colloquium
Dr. Dacheng Lin
A star wandering too close to a massive black hole (BH) can be pulled apart by the black hole's intense tidal force.
Monday, May 6, 2019 - 2:30pm to 5:00pm  ·  Colloquium
Friday, April 26, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Ben Hunt, Department of Physics, Carnegie Mellon University

The physics of superconductors in reduced dimensions — two in particular — is related to such varied phenomena as high-temperature superconductivity, topological superconductivity, and the paradigmatic quantum phase transition, the superconductor-insulator transition.

Friday, April 12, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Nandini Trivedi, Ohio State University

Within the Landau paradigm we define a phase or a state of matter by a local order parameter, as in crystals, magnets and superconductors. However, due to frustration generated by geometry and interactions, some materials do not order, even at the lowest temperatures, and enter a new state of matter called a quantum spin liquid.

Friday, March 29, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Dr. Joshua Wood, University of Wisconsin

Since discovering the existence of a diffuse flux of high-energy astrophysical neutrinos in 2013, the IceCube Neutrino Observatory has worked to identify astrophysical sources of high energy neutrinos. Recently, a high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056.

Friday, March 22, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Dr. Xin (Tony) Tong, Institute of High Energy Physics, Chinese Academy of Sciences (CAS)

Abstract:  Neutron scattering, as a tool for the investigation of materials in all their diversity and complexity, was pioneered in the north American in the 1950s. Early instrumental techniques were quickly established to unravel atomic structures of materials as well as atomic dynamics, for which Cilff Shull and Bert Brockhouse were awarded the Nobel prize in physics in 1994, many years after their pioneering work but at a time when neutron scattering was applied and a truly indispensable tool to a very wide spectrum of scientific fields.

Friday, March 8, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Per Berglund, University of New Hampshire

I will discuss how semi-realistic four dimensional spacetimes are obtained from string theory including a new class of Calabi-Yau manifolds, which generalizes earlier notions of mirror symmetry.

Friday, February 22, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Charles Gammie, University of Illinois Urbana-Champaign
Friday, February 8, 2019 - 3:10pm to 4:00pm  ·  Colloquium
Prof. Morgan E O'Neill, Stanford University

Hurricanes are ubiquitous in the terrestrial tropics, and their definition often includes a sea surface temperature threshold, latitude range and other parameters unique to the present-day climate. However, a decade ago the Cassini mission observed Earth-sized cyclones on both poles of Saturn. In the last two years the Juno mission spotted bizarre packings of similar cyclones at Jupiter’s poles. These massive cyclones are by no means tropical but they seem to be a similar phenomenon in some ways to hurricanes on Earth.

Friday, October 26, 2018 - 3:10pm to 4:00pm  ·  Colloquium
Dr. Sami Mitra, Physical Review Letters

In a talk structured to encourage interspersed Q and A, I will discuss
the dissemination of your physics results that follows the lab, the
keyboard, and the desk. You communicate results through posters,
talks, and papers in a cascading sequence that entails interacting
with journal editors, referees, conference organizers, journalists,
department chairs, deans, funding agencies, and others. I will focus
on this post-research collaborative process in physics, now in a state
of flux in the age of social media and Google Scholar, primarily