# Past Events

**Friday, September 20, 2019 - 7:30pm**

Duke Teaching Observatory

Observe the sky through modern 10" telescopes, guided by Duke physicists. Free event, everyone welcome. Weather dependent. Check web page for weather cancellation updates

**Wednesday, September 18, 2019 - 1:45pm**

Physics 298

**Speaker:**Benjamin Hamm

I will continue with a short recap of parallel transport and Riemann curvature. From here I will finally introduce the stress-energy tensor and the notion of energy-momentum conservation. We will then derive the Einstein equation from the Hilbert Action, and discuss the fact that the Hilbert... Read More »

**Wednesday, September 11, 2019 - 1:45pm**

Physics 298

**Speaker:**Benjamin Hamm

This week I will start with a brief introduction of the Einstein Equations. From here, I will introduce the concepts of parallel transport and geodesic deviation, and ultimately use them to motivate a discussion of the Riemann curvature tensor. I will also provide a brief discussion and... Read More »

**Wednesday, September 4, 2019 - 3:30pm**

Physics 130

**Speaker:**Nigel Goldenfeld (University of Illinois at Urbana-Champaign)

This event has been canceled due to Hurricane Dorian.The Life and Death of TurbulenceTurbulence is the last great unsolved problem of classical physics. But there is no consensus on what it would mean to actually solve this problem. In this colloquium, I propose that turbulence is most fruitfully... Read More »

**Wednesday, August 28, 2019 - 1:45pm**

Physics 298

**Speaker:**James Wheeler

I'll give a brief review of the mathematical structures underlying General Relativity, at each step giving a physical motivation for invoking the structure. My perspective will be from the standpoint of asking what kind of global structure we can reasonably infer from the local observations we're... Read More »

**Thursday, August 22, 2019 - 11:30am**

Physics 298

**Speaker:**Alexey Gorshkov (University of Maryland)

Atomic, molecular, and optical systems often exhibit long-range interactions, which decay with distance r as a power law 1/r^alpha. In this talk, we will derive bounds on how quickly information can propagate and entanglement can be generated in such quantum systems. We will also present protocols... Read More »

**Wednesday, August 21, 2019 - 11:30am**

Physics 119

**Speaker:**Slava Rotkin (Pennsylvania State University)

Novel 2D materials (2DMs), a class of electronic single/few-layer lattices, demonstrate a number of unique physical effects. Among those, their electronic properties were shown to depend on the stacking order of the individual layers, specifically on their angular registry aka twist. Intuitively... Read More »

**Tuesday, August 6, 2019 - 11:30am**

Physics 298

**Speaker:**Ian MacCormack (University of Chicago)

Starting with a system described by a conformal field theory (e.g. a critical spin chain or free fermions), one can find interesting violations to the typical logarithmic behavior of the bipartite entanglement entropy by introducing an inhomogeneous kinetic term in the Hamiltonian. Two examples of... Read More »

**Monday, June 17, 2019 - 11:30am**

Physics 298

**Speaker:**Amit Ghosal (Indian Institute of Science Education and Research Kolkata)

Orbital magnetic field and strong disorder weaken superconducting correlations acting individually on a type-II s-wave superconductor. The Abrikosov vortex lattice, resulting from the applied magnetic field, melts with an increase of the strength of the field, turning the system into a metal.... Read More »

**Thursday, June 6, 2019 - 11:30am**

Physics 298

**Speaker:**Thomas Banks (Rutgers University)

I will discuss an approximate equation for the two-point charge density correlation of the homogeneous electron fluid based on the large N expansion of this model. Large N considerations also lead to a conjecture about a colloidal phase in between the Wigner-crystal and fluid phases as first... Read More »