# Events Archive

## 2016

### Special seminar - Stuart Parkin, Max Planck Institute (Halle), “Domain Wall Spin-Orbitronics: Rise of Racetrack Memory!”

Mon, Apr 11, 2016, 1:15 pm to 2:15 pm
Memory-storage devices based on the current controlled motion of a series of domain walls (DWs) in magnetic racetracks promise performance and reliability beyond that of conventional magnetic disk drives and solid state storage devices(1).

### Biophysics Seminar - Polly Fordyce, Stanford

Mon, Apr 11, 2016, 12:00 pm to 1:00 pm

Lunch @ 11:45, seminar 12-1:00

### High Energy Theory Seminar - Sebastian Franco, CUNY - "Branes and 2d (0,2) Gauge Theories"

Fri, Apr 8, 2016, 1:45 pm to 3:00 pm
Abstract: Engineering quantum field theories in String Theory in terms of branes is a powerful approach for understanding their dynamics. In this talk, I will present recent progress in the realization of 2d N=(0,2) gauge theories in terms of branes.

### Gravity Group Alessandra Buonanno, Max Planck Institute for Gravitational Physics

Fri, Apr 8, 2016, 12:30 pm to Fri, Mar 25, 2016, 1:30 pm
Note: Joint with the PCTS workshop GR@100++. Lunch will be provided in the PCTS Lounge, starting at Noon.

### Gravity Group Seminar, Alessandra Buonanno (MPI for Gravitational Physics) "GW150914 and the next challenges..."

Fri, Apr 8, 2016, 12:30 pm to 1:30 pm

Title: GW150914 and the next challenges in gravitational-wave observations Joint event with the "GR@100++" PCTS workshop. Note special time! For Gravity Group members who attend the seminar talk, there is a free lunch with the workshop participants, starting at Noon. The talk is open for everybody.

### 41st Annual Donald R. Hamilton Lecture: Gary Horowitz, UC-Santa Barbara, "Strange Views of Space and Time: From Einstein to String Theory"

Thu, Apr 7, 2016, 8:00 pm to 9:30 pm

Our understanding of space and time was revolutionized a hundred years ago by Einstein’s discovery of his special and general theories of relativity. We have recently undergone another dramatic change in our understanding of these fundamental concepts due to advances in string theory.

Audience: This event is free and open to the public.

### Physics Group Meeting - IAS - Discussion group led by Juven Wang, Member IAS - “Quantum Statistics and Spacetime Topology”

Wed, Apr 6, 2016, 1:30 pm to 2:30 pm
I will discuss the recent work on the quantum statistics of particle and loop-like string excitations in 3+1D.

### Math Physics Seminar, Juerg Froehlich, ETH, Zurich, "Physical implications of the chiral anomaly -"

Tue, Apr 5, 2016, 4:30 pm to 5:30 pm
Starting with an analysis of chiral edge currents in 2D electron gases exhibiting the quantum Hall effect I will discuss the role of anomalous chiral edge currents and of anomaly inflow in 2D insulators with explicitly broken parity and time-reversal and in time-reversal-invariant 2D topological insulators exhibiting edge spin-currents.

### High Energy Theory Seminar - John Cardy, University of California, Berkeley - "Quantum Revivals after a Quench in CFT "

Mon, Apr 4, 2016, 2:30 pm to 3:30 pm
I consider properties of the return amplitude $F(t)=\langle\Psi(t)|\Psi(0)\rangle$ following a quantum quench in a CFT on a finite manifold $M$ of dimension $d-1$ from a state $|\Psi(0)\rangle$ with area-law entanglement.

### Condensed Matter Seminar, Monika Aidelsburger, Col. of France, "Artificial gauge fields and topology with ultracold atoms in optical lattices"

Mon, Apr 4, 2016, 12:00 pm to 1:30 pm
Many intriguing condensed matter phenomena such as the integer and fractional quantum Hall effect arise due to the non-trivial topological properties of the underlying system. Synthetic materials

### Gravity Group Lunch Seminar, Kris Sigurdson (IAS) "Gravity as a window onto new particle interactions in the dark Universe"

Fri, Apr 1, 2016, 12:00 pm

Gravity's universal coupling to particles and fields makes it our most robust probe of Nature. In the past century it has alerted us to both dark matter and dark energy and our precision gravitational gaze may still have surprises in store.

### Hamilton Colloquium Series - David Snoke, U. Pittsburgh: "Superfluids of light: Bose-Einstein condensation of polaritons in microcavities"

Thu, Mar 31, 2016, 4:30 pm to 6:00 pm

In specially designed solid microcavities, the photon properties can be altered to have effective mass and repulsive interactions; these new states are called "polaritons". The polaritons act like atoms, and because they are bosons, they can undergo Bose-Einstein condensation.

### Special Condensed Matter Seminar, Panagiotis Kotetes, U. of Copenhagen, "Signatures of Majorana fermions in Shiba chains with or without spin-orbit in

Thu, Mar 31, 2016, 2:00 pm to 3:30 pm
Recent spin polarized scanning tunneling microscopy (SPSTM) experiments in magnetic chains [1] opened new routes for detecting the elusive Majorana fermions (MFs). Within the deep Shiba limit we calculate [2] the spatially resolved tunneling conductance of topological ferromagnetic chains [1,3] measurable by means of SPSTM.

### Math Physics Seminar, David Brydges, U of British Columbia, "The lace expansion for $\phi^{4}$"

Tue, Mar 29, 2016, 4:30 pm to 5:30 pm
The lace expansion provides a formula for the two point function which has been useful for critical percolation, self-avoiding walk and related problems in high dimensions. Recently Akira Sakai has shown that the Ising model and the one component $\phi^4$ model admit similar formulas. I will review the basic features of the lace expansion and

### High Energy Theory Seminar IAS - Ahmed Almheiri, Stanford University - "Linearity of Holographic Entanglement Entropy”

Mon, Mar 28, 2016, 2:30 pm to 3:30 pm
We consider the question of whether the leading contribution to the entanglement entropy in holographic CFTs is truly given by the expectation value of a linear operator as is suggested by the Ryu-Takayanagi formula.

### High Energy Theory Seminar - Andrew (Liam) Fitzpatrick, Boston University - “Conformal Bootstrap Bounds on Charged States in 2D CFTs at c>1”

Fri, Mar 25, 2016, 1:45 pm to 3:00 pm
"Applying conformal bootstrap techniques to 2d CFTs with an abelian current, we prove explicit bounds on the dimension of the lightest charged state in the theory. We comment on the implications for charged states in three dimensional theories of gravity."

### Gravity Group Seminar, Chuck Bennett (Johns Hopkins University) "Cosmic Convergence?"

Fri, Mar 25, 2016, 12:00 pm to 1:00 pm

Do we have a Standard Model of Cosmology that explains all cosmological measurements with six well-specified parameter values? Having recently celebrated the 50th anniversary of the discovery of the CMB, I summarize what we have learned from the CMB (our most powerful cosmological tool) and from combining the CMB with other cosmological data....

### Condensed Matter Seminar, Michael Gullans, NIST/U. of MD, " Quantum Nonlinear Optics"

Thu, Mar 24, 2016, 12:00 pm to 1:00 pm
In the semiclassical theory of nonlinear optics, the nonlinear response of the medium is typically treated perturbatively and characterized in terms of just a few phenomenological parameters.  The remaining task, in this case, is to measure these coefficients as a function of frequency, wavevector, temperature, etc.  However, when the medium...