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

# Events Archive

## 2018

### Biophysics Seminar: Bonnie Bassler "Quorum-Sensing Control of Biofilm Formation in Vibrio cholerae"

### HET Seminar at IAS | Pavel Putrov, Member, School of Natural Sciences, IAS | “Topological Terms in Yang-Mills Theory with Time-reversal Symmetry”

In my talk I will explicitly describe what topological termspreserving time-reversal symmetry one can introduce in 3+1d Yang-Mills theory. Classification of such terms corresponds to classification of SPTs via cobordisms proposed by Kapustin and Freed-Hopkins.

### Gravity Group Lunch Seminar, Vera Gluscevic (IAS) "Cornering Dark Matter"

On galactic scales, structure is gravitationally held by dark matter, while stars and gas present merely an “icing on the cake.” In spite of their dominance over the matter budget in the universe, particle constituents of dark matter have eluded detection and characterization to the present day.

### Hamilton Colloquium Series: Avi Wigderson, Institute for Advanced Study, "The Brascamp-Lieb inequalities: structure and algorithms"

The celebrated Brascamp-Lieb (BL) inequalities, and their reverse form of Barthe, is a powerful framework which unifies and generalizes many important inequalities in analysis,

convex geometry and information theory.

### Lieb Celebration | Jadwin A10

1:15 - 2:15 **Bruno Nachtergaele (UC Davis)**

"Quantum spin systems: from the LSM theorem, LR bounds and the AKLT model to the stability of topological superselection sectors"

2:30 - 3:30 **Eric Carlen (Rutgers)**

"Strong Subadditivity of Quantum Entropy, and recent developments"

### Lieb Celebration | Taplin Auditorium

1:15 - 2:15 **Ian Jauslin (IAS)**

"Dimers, spins and loops; transfer matrices, the TL algebra, and emerging fermions"

### HET Seminar at IAS | Cumrun Vafa, Harvard University | “6d Theories on Circle and Curves”

In this talk I review new results obtained for SCFT's in 4 and 5 dimensions by compactifying 6 dimensional (1,0) SCFT's on a circle or on Riemann surfaces.

### Biophysics Seminar: Mala Murthy, Princeton

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

### Special Cosmology Talk, Tyler Natoli (Dunlap Institute) "The South Pole Telescope: From SPTpol to SPT-3G"

The South Pole Telescope (SPT) is a 10 meter CMB telescope located at the Amundsen Scott South Pole Station. From 2012 to 2017 SPTpol, the 1st polarization sensitive camera on the SPT, took observations of the CMB. In 2017 SPT-3G, a new camera with 2,700 tri-chroic pixels and 16,200 transition edge sensor bolometers was installed on the SPT.

### HET Seminar | Bruno Le Floch, Princeton | "Orbifolds of 4d N=2 supersymmetric gauge theories" | Jadwin A06

After recalling how some 4d N=2 gauge theories arise from reductions of 6d N=(2,0) superconformal theories on a Riemann surface, I will discuss two discrete quotients with codimension 2 orbifold singularities. In the first case the orbifold acts by rotations around one plane of the 4d N=2 theory; this is related to a Gukov-Witten surface...

### Gravity Group Lunch Seminar, David Spergel (CCA, NYC) "The Search for Dark Energy and NASA’s WFIRST mission"

### HET Seminar | Shiroman Prakash, Dayalbagh Educational Institute, Agra | "A Review of Bifundamental Chern-Simons Theories and the M/N Expansion" | PCTS Seminar Room

In this talk we will review some results and conjectures about non-supersymmetric bifundamental $U(N)\timesU(M)$ Chern-Simons coupled to matter. It is an apparently unique feature of three-dimensions that one can easily define a variety of non-supersymmetric lines of conformal fixed points via the Chern-Simons kinetic term for a gauge field.

### Pheno & Vino Seminar | Lina Necib, MIT| "Empirical Determination of the Dark Matter Velocity Distribution" | Jadwin 303

Abstract: Using the hydrodynamic simulation Eris, as well as various realizations of the Milky Way from the FIRE simulation, we found that the kinematics of dark matter follows closely the kinematics of old metal poor stars.

### HET Seminar | Ibrahima Bah, Johns Hopkins U | "Holographic duals of 6D SCFTs on Riemann Surfaces" | PCTS Seminar Room

Four-dimensional superconformal field theories can be studied and partially classified by compactifying six-dimensional ones on punctured Riemann surfaces. In this talk we discuss the holographic dual of this set-up and explore how various gravitational sources encode the data associated to the punctures.

### Biophysics Seminar: Miriam Goodman, Stanford "Deciphering Touch Sensation and Neuronal Mechanoprotection"

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

### HET Seminar at IAS | Dan Roberts, Facebook AI Research | “A Few Uses for Theoretical Physics in Machine Learning”

### HET Seminar at IAS | Guifre Vidal, Perimeter Institute | “Tensor Networks as Geometry”

The multiscale entanglement renormalization ansatz (MERA) is a tensor network that can efficiently approximate ground states of critical spin chains --that is, lattice versions of 1+1 CFTs. Its network structure extends in an additional dimension corresponding to renormalization group scale.

### Gravity Group Lunch Seminar, Kris Pardo (Princeton University) "Testing Modified Gravity with Dwarf Galaxies and Gravitational Waves"

Many modified gravity theories attempt to explain dark matter or dark energy by modifying general relativity; however, these theories can be powerfully constrained by existing astrophysical data. I will discuss how isolated dwarf galaxies can be used to test Verlinde's Emergent Gravity, a theory that attempts to account for dark matter.

### Hamilton Colloquium Series: Ila Fiete, University of Texas at Austin, "Neural circuitry for navigation in metric spaces"

I will review key computational aspects of navigation and describe the brain’s circuits that underlie it. These circuits contain neurons with remarkable responses to spatial variables, including head direction cells, grid cells, and place cells.

### Pheno & Vino Seminar | Patrick Meade, Stony Brook U. "Exploring the Early Universe with the Higgs" Jadwin 303

Abstract: I will discuss how we can probe the early universe through studying the properties of the Higgs. I will also demonstrate how the early universe can have a different phase history than is typically assumed. Additionally, I will demonstrate how thermal resummation techniques can be used to study the early universe more accurately. ...