Events Archive


Gravity Initiative Lunch, Elias Most | Flatiron Institute "Constraints on nuclear physics and electromagnetic precursors from neutron star mergers"

Mon, Dec 2, 2019, 12:30 pm

With the detection of GW170817 we have observed the first multi-messenger gravitational wave signal from two merging neutron stars. This signal carried a multitude of information about the underlying equation of state (EOS) of nuclear matter, which so far is not known for densities above nuclear saturation.

Biophysics Seminar: Damon Clark, Yale University: Mechanisms underlying visual illusions in flies| Joseph Henry Room

Mon, Dec 2, 2019, 12:00 pm

Visual systems detect many features of natural scenes, including motion. Motion detection guides critical behaviors like hunting, evading predators, and finding mates. It can be framed as an inference problem, in which light intensity measurements are combined to estimate a latent variable of image velocity.

Audience: A free lecture open to the public.

Pheno & Vino Seminar | Jo Dunkley, Princeton University | "How fast is the universe growing?" | Jadwin 303

Tue, Nov 26, 2019, 4:00 pm

There is currently a (possible) tension between various measurements of the Hubble expansion rate. I will give a recap of this issue, and describe  how we use the Cosmic Microwave Background to infer the local expansion rate.


HET Seminar - Radu Roiban - Pennsylvania State University

Mon, Nov 25, 2019, 2:30 pm
Audience: A free lecture open to the public.

HET Seminar | Radu Roiban, Penn State | “Perspectives on the Generally-Relativistic Two-Body Problem from Double Copy & EFT”| Bloomberg Lecture Hall

Mon, Nov 25, 2019, 2:30 pm

While the flat space two-body problem is integrable, the generally-relativistic one is not starting at the next-to-leading order.


Gravity Initiative Lunch, Elena Giorgi | PGI, "The Teukolsky equations in Kerr-Newman spacetime"

Biophysics Seminar: Melike Lakadamyali, UPENN: Super-resolution imaging of chromatin structure and dynamics|Joseph Henry Room

Mon, Nov 25, 2019, 12:00 pm

Audience: A free lecture open to the public.

Gravity Group Lunch Seminar, Andrew Chael | PCTS "The black hole-jet connection in M87: linking simulations to VLBI images"

Fri, Nov 22, 2019, 12:00 pm

The Event Horizon Telescope (EHT) has produced the first image of the 1.3 mm-wavelength emission around the black hole "shadow" at the heart of M87.

Hamilton Colloquium Series, Michal Lipson, Columbia University, "The Revolution of Silicon Photonics" Jadwin A-10

Thu, Nov 21, 2019, 4:00 pm

We are now experiencing a revolution in optical technologies, where one can print and control massive optical circuits, on a microelectronic chip. This revolution is enabling a whole range of applications that are in need for scalable optical technologies and it is opening the door to areas that only a decade ago were unimaginable.

Audience: A free lecture open to the public.

Special Condensed Matter Seminar | Han Yan, OIST, Japan, | "Universal picture of holographic toy models from Rank-2 U(1) theory (or Lifshitz gravity)" | PCTS Seminar Room 407

Thu, Nov 21, 2019, 1:30 pm

In this talk, we address two points connecting holographic toy models and fracton states of matter. First, we show that there is a unified picture behind different holographic toy models based on tensor-networks, bit threads, and fracton model: a web of bit threads on a hyperbolic lattice.


HET Seminar | Edgar Shaghoulian, Cornell | "Integrable deformations in quantum mechanics, T-Tbar, and SYK" | Jadwin A06

Wed, Nov 20, 2019, 4:00 pm

The Wilsonian paradigm suggests universality of quantum field theory in the infrared. Interestingly, it also suggests universality of quantum mechanics (d=1 quantum field theory) in the ultraviolet. This suggests a study of the landscape of the infrared and the robustness of the ultraviolet.

Audience: A free lecture open to the public.

HET Seminar | Adam Levine, IAS | “On a Quantum Penrose Inequality” | Bloomberg Hall Physics Library

Wed, Nov 20, 2019, 1:45 pm

Description: Suggested reading:
Marc Mars, Present Status of the Penrose Inequality, arXiv:0906.5566
Netta Engelhardt and Gary Horowitz, A Holographic Argument for the Penrose Inequality in AdS, arXiv:1903.00555
Quantum Penrose Inequality, arXiv:1908.02755


Condensed Matter Seminar | Andrey Chubukov, U of Minnesota "Interplay between superconductivity and non-Fermi liquid above a quantum critical point in a metal" | Joseph Henry Room, Jadwin Hall

Wed, Nov 20, 2019, 12:00 pm

I discuss the interplay between non-Fermi liquid behaviour and superconductivity near a quantum-critical point (QCP) in a metal. The tendencies towards superconductivity and non-Fermi liquid behaviour compete: fermionic incoherence destroys the Cooper logarithm, while superconductivity eliminates scattering at low energies and restores...


Pheno & Vino Seminar | Jack Setford, Toronto | "Signatures of Mirror Stars" | Jadwin 303

Tue, Nov 19, 2019, 4:00 pm

Motivated by theories of neutral naturalness, I will argue that Mirror Stars are a generic possibility in any hidden sector with analogues of Standard Model electromagnetism and nuclear physics.


HET Seminar | Theo Johnson-Freyd, Perimeter Institute | “TMF and SQFT” | Bloomberg Lecture Hall

Mon, Nov 18, 2019, 2:30 pm

I will describe my work, all joint with D. Gaiotto and some also joint with E. Witten, to understand the homotopy type of the space of (1+1)d N=(0,1) SQFTs --- what a condensed matter theorist would call "phases" of SQFTs. Our motivating hypothesis (due in large part to Stolz and Teichner) is that this space models the spectrum called "...

Audience: A free lecture open to the public.

Gravity Initiative Lunch, Baoyi Chen | Caltech "Probing near-horizon physics via gravitational wave echoes"

Mon, Nov 18, 2019, 12:30 pm

Abstract: Because of the Black-Hole Information Paradox, and the singularity, many physicists believed that GR must be modified to incorporate quantum effects, and that such modifications may affect black-hole spacetimes. The additional near-horizon structure might modify the boundary conditions for incoming gravitational waves, and lead to...

Biophysics Seminar: Marija Zanic, Vanderbilt University: Dynamic Architecture of the Microtubule Cytoskeleton| Joseph Henry Room

Mon, Nov 18, 2019, 12:00 pm

Microtubules are active biological polymers known to stochastically switch between phases of growth and shrinkage, a behavior termed ‘dynamic instability’. Microtubule treadmilling, in which the microtubule plus end grows while the minus end shrinks, is also observed in cells.

Audience: A free lecture open to the public.

HET Seminar | Si Li, IAS; Tsinghua University | “Deforming Holomorphic Chern-Simons at Large N” | Bloomberg Lecture Hall

Fri, Nov 15, 2019, 1:45 pm

We describe the coupling of holomorphic Chern-Simons theory at large N with Kodaira-Spencer gravity. This gives a complete description of open-closed string field theory in the topological B-model. We explain an anomaly cancellation mechanism at all loops in perturbation theory in this model.


Gravity Group Seminar, Rachael Beaton | Princeton

Fri, Nov 15, 2019, 12:00 pm

Following up on Adam Riess's talk last month, Rachael Beaton, a Hubble and Carnegie-Princeton postdoctoral fellow in Astrophysical Sciences, will present the latest results from the Carnegie-Chicago Hubble program, published last summer, that provide for a determination of the...

Hamilton Colloquium Series, Michelle Simmons, University of New South Wales, Australia, "Atomic Qubits in Silicon"

Thu, Nov 14, 2019, 4:00 pm

Building a quantum computer in the highly manufacturable material silicon offers many advantages. Phosphorus atom qubits in silicon in particular have demonstrated extremely long (up to 35 s) coherence times with >99.9% fidelity.

Audience: A free lecture open to the public.