*Please join us at 12 noon for lunch, seminar from 12:15-1:15.*

# Events Archive

## 2018

### Biophysics Seminar: Robert Austin, Princeton

### HET Seminar | Yifan Wang, Princeton | "A Precision Study of 5d Superconformal Fixed Points" | PCTS Seminar Room

Interacting unitary conformal fixed points in five dimensions are mysterious objects which often do not have weakly coupled UV descriptions. Their conformal data such as operator spectrum and correlation functions appear more elusive to conventional methods than in lower dimensions.

### Gravity Group Lunch Seminar, Rachael Beaton(Princeton University), "Engineering the Measurement of the Hubble Constant"

The local expansion rate of the Universe, the Hubble constant, is one of the fundamental parameters in our current concordance cosmology and one that anchors the expansion history of the Universe. The resolution of the historical factor-of-two controversy in the Hubble constant nearly two decades ago (e.g., the Hubble Space Telescope Key...

### Hamilton Colloquium Series: Xiaoliang Qi, Stanford; "The entanglement glue for spacetime"

Einstein’s theory of general relativity tells us that gravity comes from curved space-time geometry. The space-time is like a plastic membrane which we can stretch with our energy and momentum. But what is this membrane made of? What glues the spacetime together?

### HET Seminar | Vladimir Rosenhaus, KITP Santa Barbara | "New Large N Quantum Field Theories" | PCTS Seminar Room

Quantum field theories with a large number of fields offer a number of simplifications, and in some cases allow for computations at strong coupling.

### HET Seminar | Brian Willett, UCSB | “Localization on Seifert Manifolds” | Jadwin A06

I discuss the partition functions of supersymmetric gauge theories on Seifert manifolds. First we consider the case of 3d N=2 theories on a three-manifold M_{g,p}, a degree-p principal U(1) bundle over a smooth, genus-g Riemann surface. This includes the topological index and the three-sphere and lens space partition functions as special...

### Hamilton Colloquium Series: Marek Karliner, Tel Aviv University; "The social life of heavy quarks"

I will discuss recent developments regarding new types of hadrons involving heavy quarks: hadronic molecules, doubly heavy baryons, stable tetraquarks and others. I will also explain how the discovery of the doubly heavy baryon leads to quark-level analogue of nuclear fusion, with energy release per reaction an order of magnitude greater than...

### Physics Group Meeting at IAS | Bartlomiej Czech, Institute for Advanced Study | “Modular Berry Connection”

Many quantities in the AdS/CFT correspondence, for example entanglement entropies, are defined up to a choice of UV cutoff. The cutoff can be chosen and adjusted depending on one's purposes; it represents a sort of gauge freedom. I will explain that this gauge freedom leads to physical consequences in a way that closely mirrors the construction...

### Math Physics Seminar | Ian Jauslin, IAS | "Crystalline ordering and large-fugacity expansion for hard-core lattice particle systems" | 343 Jadwin Hall

Abstract:

### Pheno & Vino Seminar | David Shih, Rutgers | "Digging Deeper for New Physics in the LHC Data" | Jadwin 303

Abstract: A typical new physics search by CMS can now have hundreds of exclusive signal regions. While this has the potential for great discriminating power, it can also obscure potentially interesting discrepancies if they do not occur in the handful of signal regions that are probed by a small set of simplified models used by the analysis....

### HET Seminar | Yasha Neiman, Okinawa Institute of Science and Technology | "Twistor and spinor-helicity languages for the free-CFT dual of higher-spin gravity" | Jadwin A06

The Penrose transform maps between functions in twistor space and solutions to free massless field equations in 4d. Higher-spin gravity is the ultimate massless 4d theory, which allows a unique geometric perspective on the Penrose transform, as I will describe.

### HET Seminar at IAS | Riccardo Rattazzi, CERN | “CFT Data at Large Charge from EFT”

Properties of CFT operators carrying some large global charge can be systematically computed in a 1/Q expansion by assuming that the corresponding states on the cylinderare described by a supefluid phase. In particular one can compute the spectrum of such “heavy" operators and the heavy-heavy-light fusion coefficients.

### Biophysics Seminar: Benjamin H Good, Berkeley

*Please join us at 12 noon for lunch, seminar from 12:15-1:15.*

### Gravity Group Lunch Seminar, Cynthia Chiang (U. KwaZulu-Natal, SA), "Illuminating the Dark Universe with Radio Observations" Jadwin A10

Observations of redshifted 21-cm emission of neutral hydrogen are a rapidly growing area of cosmology research. Measurements across a wide range of radio frequencies allow us to access redshifts that encompass a vast comoving volume, spanning both cosmic dawn and the formation of large-scale structure. I will describe two new experiments,...

### Pheno & Seminar | Ken Van Tilberg, IAS & NYU | "Resonant absorption of dark matter in molecules" | Jadwin 303

Abstract:

I will present a proposal for a new class of bosonic dark matter (DM) detectors based on resonant absorption onto a gas of small polyatomic molecules. Bosonic DM acts on the molecules as a narrow-band perturbation, like an intense but weakly coupled laser.

### Special Seminar: Christian Schneider, UCLA; "Quantum control as a resource for fundamental physics and technology"

Precise control over quantum systems is the foundation of quantum technology that will shape our society in revolutionary ways—from computation and simulation to sensing and communication. Alongside technological advances, better and better quantum control will enable new tests of fundamental physics.

### Simons Observatory, Detectors Design Review, Jadwin 202

### SPIDER Collaboration 2018, Room 233

### Special Seminar: Jia (Leo) Li, Columbia; "Correlated states in graphene double-layer in the quantum Hall regime"

The technique of layer-by-layer van der Waals (vdW) heterostructure allows any 2D material exfoliated from a bulk crystal to be reassembled into a designer architecture, making it possible to study the coupling and interplay between different emergent quantum phenomena through engineering new meta-materials.

### Gravity Group Lunch Seminar, Sherry Song and Yaqiong Li (Princeton University), Jadwin 102

**Xue (Sherry) Song, Princeton University**

"Journal Club Discussion of Watts et al. (2018) [CLASS Collaboration]"

The paper is available at https://arxiv.org/abs/1801.01481 .**Yaqiong Li, Princeton University**