Events Archive

High Energy Physics Experimental Seminar-Isobel Ojalvo-U of Wisc-Status and Future of Tau physics at the LHC
Fri, Dec 18, 2015, 3:00 pm4:30 pm
The observation of a Higgs boson by the LHC experiments through its decays to vector bosons was an extremely significant milestone in particle physics research; one which redefined the research priorities in the field. After this discovery the first step was to test the compatibility of the new particle with the SM Higgs by searching for the…
Physics Group Meeting - IAS - Discussion group led by John J. Carrasco, Member, IAS -“Color-Kinematics in Scattering Amplitudes”
Wed, Dec 16, 2015, 1:30 pm2:30 pm
Scattering amplitudes, in a wide variety of gauge theories, and independent of dimension and gauge group, have surprising kinematic structure which is currently only understood in terms of graphical rules relating the kinematic weights of graphs, in much the same way that the color-factors of graphs are related: namely by Jacobi and antisymmetry…
Pheno & Vino Surjeet Rajendran, Berkeley, "TBA"
Tue, Dec 15, 2015, 4:00 pmTue, Dec 8, 2015, 5:30 pm

Pheno & Vino Seminar, Surjeet Rajendran, Berkeley, "New Directions in Searching for the Dark Universe"
Tue, Dec 15, 2015, 4:00 pm5:30 pm
In this talk, we discuss ways to search for a wide variety of ultralight bosonic dark matter using precision instruments and probes of ultramassive dark matter using astrophysical probes such as exploding white dwarfs.

Special High Energy Theory Seminar - Zohar Komargodski, Weizmann Institute of Science - "Disordered Conformal Field Theories"
Tue, Dec 15, 2015, 12:30 pm1:30 pm
We consider Conformal Field Theories perturbed by quenched disorder. Such systems often flow to new, disordered, fixed points of the renormalization group. For the Ising model in d = 3 with random bonds, we calculate some properties of the disordered fixed point in perturbation theory in the heat capacity exponent. We compare with experimental…
Special Particle Astrophysics Seminar:"Recent dark matter search results from DarkSide-50 using underground argon" Alden Fan-UCLA
Mon, Dec 14, 2015, 3:00 pm4:00 pm
Abstract: While there is tremendous astrophysical and cosmological evidence for dark matter, its precise nature is one of the biggest open questions in modern physics. The DarkSide experiment is looking for WIMP dark matter using a liquid argon target located deep underground at Gran Sasso National Laboratory (LNGS) in Italy. DarkSide-50 is the…
High Energy Theory IAS - Daniel Roberts, Massachusetts Institute of Technology, “Chaos in Quantum Channels”
Mon, Dec 14, 2015, 2:30 pm3:30 pm
Motivated by black hole physics and holography, we study chaos, scrambling, and complexity by considering the entanglement properties of unitary operators. First, we develop a diagnostic of chaos by directly considering the time evolution of a simple local operator. This leads us to out-of-time-order (OTO) four-point functions as an indicator of…
Biophysics Seminar - Eleni Katifori, U. Penn "Emerging hierarchies in biological distribution networks'
Mon, Dec 14, 2015, 12:00 pm1:00 pm
Biological transport webs, such as the blood circulatory system in the brain and other animal organs, or the slime mold Physarum polycephalum, are frequently dominated by dense sets of nested cycles. The architecture of these networks, as defined by the topology and edge weights, determines how efficiently the networks perform their function. In…
High Energy Theory - Bruno Le Floch, Princeton University - "AGT correspondence for surface operators"
Fri, Dec 11, 2015, 1:45 pm3:00 pm
Compactifying 6d N=(2,0) superconformal theories on Riemann surfaces yields 4d N=2 gauge theories. The sphere partition function of such a 4d theory is equal to a CFT correlator on the Riemann surface. The correspondence can be enriched by including half-BPS operators of codimension 2 or 4 in the 6d N=(2,0) theory. Depending on their …
Gravity Group Seminar, "Astronomy's "Next Big Thing:" What can we expect from direct gravitational--wave observations in the near term?”
Fri, Dec 11, 2015, 12:00 pm1:30 pm

Speaker(s): Szabolcs Marka adn Imre Bartos, Columbia University in the City of New York Advanced LIGO's completion and ongoing observation run might put the first direct detection of gravitational waves on the horizon, just in time for the 100th anniversary of Einstein's prediction. Beyond the eventual discovery, there is a growing focus on…

Hamilton Colloquium Series: Steven Tobias, University of Leeds (UK), "Order from Chaos: From the Solar Cycle to the Jets on Jupiter"
Thu, Dec 10, 2015, 4:30 pm6:00 pm

The eleven year solar activity cycle is a remarkable example of regular behavior emerging from an extremely turbulent system. The jets on Jupiter sit unmoving on a sea of turbulent eddies. Astrophysical phenomena often display organization on spatial and temporal scales much larger than the turbulent processes that drive them. An outstanding…

CM Seminar-B. Frandsen Columbia U-“From Mott insulators to Weyl fermions: Using muons, neutrons, & photons to probe unconventional states of matter"
Thu, Dec 10, 2015, 1:00 pm2:30 pm
to uncover the fundamental properties of these new topological phases of matter. The two most fruitful routes to novel states of matter in modern condensed matter physics have been through “strongly correlated electron materials,” where the strength of the interactions between electrons compares to or exceeds the other energy scales in the system…
Special Condensed Matter Physics Seminar - Stefan Putz, TU Wien - "Circuit Cavity QED with Collective Spin States"
Thu, Dec 10, 2015, 11:00 am12:00 pm
In this talk I will present recent progress in examining collective spin phenomena’s such as cavity protection, spectral hole burning and amplitude bi-stability in a hybrid solid state system consisting of a superconducting microwave cavity strongly coupled to an ensemble of electron spins in nitrogen-vacancy centers in diamond. I will show how…
Seeing through the haze: Constraining dark-matter annihilation in the presence of astrophysical point sources - Ben Safdi, MIT
Wed, Dec 9, 2015, 3:30 pm4:30 pm
Dark matter (DM) annihilating in the Milky Way and beyond may give rise to unique astrophysical signatures. However, these potential signs of new physics are easily confused with standard but poorly understood astrophysical backgrounds, such as populations of dim point sources like millisecond pulsars. I will present a new method to…
Physics Group Meeting- IAS-Discussion group led by Hirosi Ooguri, Visiting Professor IAS - “Charactering CFT’s with Gravitational Description"
Wed, Dec 9, 2015, 1:30 pm2:30 pm
In the Friday seminar last week, Jennifer Lin talked about our joint work to characterize gravitational effective theories whose UV completions are dual to CFT’s on the boundary. I will discuss our attempt at its converse: how to characterize CFT’s that can be described by weakly coupled gravitational theories with smooth geometries [1]. I will…
Special Condensed Matter Seminar-Monica Allen, Harvard U-"Spatially resolved edge currents & ballistic interference in a graphene Josephson junction"
Tue, Dec 8, 2015, 1:00 pm2:00 pm
Graphene provides an appealing platform to explore electronic analogs of optical effects due to the nonclassical nature of ballistic charge transport. Inspired by guiding of light in fiber optics, we demonstrate a means to guide the flow of electrons at the edges of a graphene crystal near charge neutrality. To visualize these states…
High Energy Theory - Thomas Hartman, Cornell University - "Causality Constraints in Conformal Field Theory"
Mon, Dec 7, 2015, 2:30 pm3:30 pm
In effective field theory, causality fixes the signs of certain interactions. I will describe how these Lorentzian constraints are encoded in the Euclidean theory, and use the conformal bootstrap to derive analogous causality constraints in CFT. Applied to spinning fields, these constraints include (some of) the Hofman-Maldacena bounds derived…
Condensed Matter Seminar, Ady Stern, Weizmann Inst., "Fractionalized edge phases"
Mon, Dec 7, 2015, 1:15 pm2:30 pm
Edges of gapped topological states may host gapless edge modes that cannot be realized as stand-alone systems. Examples include quantum Hall edge states, surface states of topological insulators and super-conductors, etc. In my talk I will examine situations in which these edge states form fractionalized phases of their own. Examples to be…
Biophysics Seminar - Long Cai, Caltech “Single cell mRNA profiling in situ by sequential FISH (seqFISH)”
Mon, Dec 7, 2015, 12:00 pmMon, Sep 21, 2015, 1:00 pm
We have recently demonstrated a technology using sequential hybridization and single molecule FISH to multiplex a large number of mRNA molecules directly in single cells in complex tissue samples. mRNAs in cells are barcoded by sequential rounds of hybridization, imaging, and probe stripping. The number of barcodes available with this approach…
Biophysics Seminar - Long Cai, Caltech “Single cell mRNA profiling in situ by sequential FISH (seqFISH)”
Mon, Dec 7, 2015, 12:00 pm1:00 pm
We have recently demonstrated a technology using sequential hybridization and single molecule FISH to multiplex a large number of mRNA molecules directly in single cells in complex tissue samples. mRNAs in cells are barcoded by sequential rounds of hybridization, imaging, and probe stripping. The number of barcodes available with this approach…