Events Archive

2016

HET Seminar | Dalimil Mazac | Perimeter Institute | "Towards Analytic Conformal Bootstrap"

Mon, Oct 3, 2016, 2:30 pm to 3:30 pm
Conformal bootstrap equations have demonstrated a strong constraining power in various spacetime dimensions. However, the most exciting results concerning the low-lying spectrum of operators have only been derived using extensive numerics. It is therefore very important to develop the corresponding analytic understanding.

Condensed Matter Seminar, Chandra Varma, UCR, "Quantum Critical Fluctuations Leading to Strange Metals and Superconductors in 2D Metallic ..."

Mon, Oct 3, 2016, 1:15 pm to 2:30 pm
Models for metallic anti-ferromagnets map to the dissipative XY model as do XY ferromagnets, the superconductor-insulator transition, and the model forloop-current order in Cuprates. The spectral function of the quantum-critical fuctuations for this model in 2D for a range of parameters is determined by

HET Seminar | Kantaro Ohmori | School of Natural Sciences, IAS | “M-theory and 6d SCFTs”

Fri, Sep 30, 2016, 1:45 pm to Thu, Sep 29, 2016, 3:00 pm
When a M5 branes probes the singular locus of the D,E type ALE orbifold, the M5 brane exhibits fractionation, which corresponds to activating tensor branch moduli of the 6d N=(1,0) SCFT living on the M5. I explain how the fractionation patterns can be identified using the T^3 compactification, and propose some open problems related to M-theory...

Gravity Group Seminar, Mark Kamionkowski (JHU), "Dust polarization and interstellar turbulence"

Fri, Sep 30, 2016, 12:00 pm to 1:30 pm

Perhaps the most surprising result from the Planck satellite is the observation that the E-mode power in the dust polarization is twice that in the B mode, in stark contrast to pre-Planck expectations of roughly equal dust powers in E and B modes.

Hamilton Colloquium Series: Frans Pretorius, Princeton; "The Dynamical Strong-field Regime of General Relativity"

Thu, Sep 29, 2016, 4:30 pm to 6:00 pm

In this talk I will describe the recent detection of gravitational waves by the LIGO/Virgo collaboration. The main event heard, GW150914, is consistent with the emission of gravitational waves from the late inspiral, merger and ringdown of two heavy stellar mass black holes.

Special Condensed Matter Seminar, Adam Nahum, MIT, "Quantum entanglement growth under random unitary dynamics"

Thu, Sep 29, 2016, 2:00 pm to 3:30 pm
A quantum many-body system, prepared initially in a state with low entanglement, will entangle distant regions dynamically. How does this happen? I will discuss entanglement entropy growth for quantum systems subject to random unitary dynamics — i.e. Hamiltonian evolution with time-dependent noise, or a random quantum circuit.

Math Physics Seminar, Eliran Subag, Weizmann, "Critical points and the Gibbs measure of a spherical spin glass model"

Tue, Sep 27, 2016, 4:30 pm to 5:30 pm
For integers N let H_N(x) be an isotropic Gaussian field on the N-dimensional unit sphere, meaning that Cov(H_N(x),H_N(y)) is a function, f_N, of the inner product of . The spherical spin glass models of statistical mechanics are such random fields, with f_N = N f with the function independent of the dimension N.

Pheno & Vino Seminar, Rouven Essig, Stony Brook, "New Direct-Detection Probes of sub-GeV Dark Matter"

Tue, Sep 27, 2016, 4:00 pm to 5:30 pm
Dark matter with MeV-to-GeV masses is a theoretically and phenomenologically interesting possibility. In this talk, I will describe how direct-detection experiments can probe this largely unexplored mass range.

HET Seminar | Vijay Balasubramanian | University of Pennsylvania | “New Forms of Entanglement and Holography”

Biophysics Seminar speaker Jane Wang, Cornell

Mon, Sep 26, 2016, 12:00 pm to 1:00 pm
"Insect flight: from Newton’s law to Neurons"
Lunch @ 11:45, seminar 12-1:00.

HET Seminar | Yifan Wang | Princeton University | "Superconformal Bootstrap in Two Dimensions"

Fri, Sep 23, 2016, 1:45 pm to 2:45 pm
Abstract: The enhanced super-Virasoro symmetries in 2d have allowed us to extract many BPS quantities exactly from 2d superconformal field theories (SCFT). In this talk, we will take advantage of our past knowledge about 2d (2,2) SCFTs, combining with the method of conformal bootstrap, to explore features of 2d (2,2) SCFTs beyond the protected...

Gravity Group Seminar, Ira Thorpe (NASA/GSFC), "The success of LISA Pathfinder and the prospects for a space-based gravitational wave observatory"

Fri, Sep 23, 2016, 12:00 pm to 1:30 pm

Abstract: "A space-based gravitational wave observatory targeting the milliHertz frequency band has the potential to inform many areas of physics and astrophysics including the nature of gravity in the strong-field limit, the formation and growth of massive black holes and their host galaxies, and the demographics of stellar compact objects.

Hamilton Colloquium Series: Ryan Patterson, Caltech; “Next questions in neutrino physics and the NOvA experiment”

Thu, Sep 22, 2016, 4:30 pm to 6:00 pm

Non-zero neutrino mass brings with it new complexity in the neutrino sector, and major questions surrounding neutrino masses and mixing remain unanswered. Among the unknowns are the ordering of the neutrino masses, key details of flavor mixing, and whether neutrinos respect CP symmetry.

Pheno & Vino Seminar, Lina Necib, Boston U., "Spherical Cows of Dark Matter: Morphology of Indirect Detection Signals"

Tue, Sep 20, 2016, 4:00 pm to 5:30 pm
The morphology of dark matter annihilation/decay signals offers a handle for discrimination of dark matter against astrophysical backgrounds. Recent advances in N-body simulations allow us to map out the expected distribution of morphological parameters, rather than focusing on a small sample of halos which are assumed to be representative.

Gary Horowitz, UC Santa Barbara - “Recovering the Spacetime Metric from a Holographic Dual”

Mon, Sep 19, 2016, 2:30 pm to 4:00 pm
I will describe a new approach to determining the bulk geometry from a dual field theory. This is based on a special class of spacelike cross-sections of the boundary called light-cone cuts. I will first show that the conformal metric in the bulk (i.e.

Biophysics Seminar speaker Olga Dudko, UCSD

Mon, Sep 19, 2016, 12:00 pm to 1:00 pm
"How do distant DNA segments find each other? From trajectories to principles to testable predictions”.
Lunch @ 11:45, seminar 12-1:00

David R. Morrison, UC Santa Barbara - "TBA"

Mon, Sep 19, 2016, 11:00 am to 12:30 pm


Hamilton Colloquium Series: John Ellis, King's College London & CERN; “Radioactive Iron Rain: Evidence of a Recent Nearby Supernova Explosion”

Thu, Sep 15, 2016, 4:30 pm to 6:00 pm

A very close supernova explosion could have caused a mass extinction of life in Earth. In 1996, Brian Fields, the late Dave Schramm, and the speaker proposed looking for unstable isotopes such as Iron 60 that could have been deposited by a recent nearby supernova explosion.

Pheno & Vino Seminar, Daniele Alves, Princeton, "Goldstone Gauginos"

Tue, Sep 13, 2016, 4:00 pm to 5:30 pm
The lack of gluino signals in existing LHC data makes Dirac gauginos more motivated in weak scale SUSY phenomenology. I will describe a solution to a long-standing challenge in Dirac Gaugino model building, namely, how to avoid ubiquitous tachyons charged under the Standard Model gauge symmetries.

Jeffrey Harvey, UChicago - "Moonshine, old and new”

Mon, Sep 12, 2016, 2:30 pm to 4:00 pm
Moonshine in mathematics originally referred to unexpected connections between the modular J function and the representation theory of the Monster, the largest sporadic finite group.

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