# Events Archive

## 2019

### Gravity Group Lunch Seminar, Colin Hill | IAS/CCA "Extragalactic Foreground Biases in Primordial non-Gaussianity Measurements from the CMB"

Fri, Apr 19, 2019, 12:00 pm

Abstract: The cosmic microwave background (CMB) temperature bispectrum is currently the most precise tool for constraining non-Gaussianity (NG) in the primordial curvature perturbations.  The Planck temperature data tightly constrain the amplitude of local-type NG, as could be generated in (e.g.) multi-field inflation: f_NL^loc = 2.5 +/- 5.7. ...

### Hamilton Colloquium Series, Pupa Gilbert, University of Wisconsin-Madison,"How Organisms Build Crystals"

Thu, Apr 18, 2019, 4:00 pm

Crystalline biominerals cost energy but provide the diverse organism making them with scaffolding, shielding, locomotion, mastication, gravity and magnetic field sensing, etc.

Audience: A free lecture open to the public.

### The Second Kind of Impossible: The Extraordinary Quest for a New Form of Matter, Paul Steinhardt

Wed, Apr 17, 2019, 6:00 pm

We invite you out to hear about one of the most fascinating scientific detective stories of the last fifty years, an exciting quest for a new form of matter. This story is like James Gleick’s Chaos combined with an Indiana Jones adventure. Full event details.

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### Pheno & Vino Seminar | Matthew Moschella, Princeton University | "Testing Alternatives to Dark Matter in the Milky Way" | Jadwin 303

Tue, Apr 16, 2019, 4:00 pm

The observed flattening of rotation curves is usually considered strong evidence for the existence of dark matter on galactic scales.   However, observations such as the Baryonic Tully-Fisher Relation and the Radial Acceleration Relation suggest that the observed dynamics in galaxies are strongly correlated with the distribution of baryonic...

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### HET Seminar at IAS | Alexandre Streicher, University of California, Santa Barbara | “Quantum Epidemiology: Operator Growth, Thermal Effects, and SYK”

Mon, Apr 15, 2019, 2:30 pm

In many-body chaotic systems, the size of an operator generically grows in Heisenberg evolution, and is measured by out-of-time-ordered four-point functions. However, these only provide a coarse probe of the full underlying operator growth structure.

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### Biophysics Seminar: Markus Meister, California Institute of Technology| "Large Ratios in Brain Science "| Joseph Henry Room

Mon, Apr 15, 2019, 12:00 pm

In physics and engineering dimensionless numbers frequently help to characterize the state of a system. I will present a series of vignettes about unusually large dimensionless numbers that arise in brain science. These can indicate issues that are poorly understood, and in some cases clearly misunderstood.

Audience: A free lecture open to the public.
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### Physics Department Recital

Fri, Apr 12, 2019, 7:00 pm

### Donald R. Hamilton Lecture:Elena Aprile,Columbia University,"The Xenon Project:At the Forefront of Dark Matter Direct Detection" McDonnell A01

Thu, Apr 11, 2019, 8:00 pm

What is the Dark Matter which makes 85% of the matter in the Universe? We have been asking this question for many decades and used a variety of experimental approaches to address it,   with detectors on Earth and in space.

Audience: A free lecture open to the public.
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### Hamilton Colloquium Series, Hirosi Ooguri, Caltech, "Constraints on Quantum Gravity"

Thu, Apr 11, 2019, 4:00 pm

Superstring theory is our best candidate for the ultimate unification of general relativity and quantum mechanics. Although predictions of the theory are typically at extremely high energy and out of reach of current experiments and observations, several non-trivial constraints on its low energy effective theory have been found.

Audience: A free lecture open to the public.
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### The Gravity Initiative Spring Conference | Weak Gravity and Cosmic Censorship: Conjectures and Connections

Wed, Apr 10, 2019, 8:15 am to Fri, Apr 12, 2019, 4:00 pm

Speakers:
Nima Arkani-Hamed, IAS; Oscar Campos Dias, University of Southampton, Mihalis Dafermos, Princeton; Frederik Denef, Columbia; Roberto Emparan, University of Barcelona; Isabel Garcia Garcia, UCSB; Gary Horowitz, UCSB; Jonathan Luk, Stanford; Hirosi Ooguri, CALTECH; Matt Reece, Harvard; Tom Rudelius, IAS; Ed...

### Math Physics Seminar | Ramis Movassagh, IBM Research | "Highly entangled spin chains: Exactly solvable counter-examples to the area law" | Jadwin 343

Tue, Apr 9, 2019, 4:30 pm

In recent years, there has been a surge of activities in proposing "exactly solvable" quantum spin chains with surprising high amount of ground state entanglement--exponentially more than critical systems that have $\log(n)$ von Neumann entropy. We discuss these models from first principles.

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### Pheno & Vino Seminar | Asher Berlin, SLAC, Stanford | "Inducing and Directly Detecting Dark Matter Currents" | Jadwin 303

Tue, Apr 9, 2019, 4:00 pm

Detecting light dark matter that interacts weakly with electromagnetism has recently become one of the benchmark goals of near-term and futuristic direct detection experiments.

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### HET Seminar | Fridrik Gautason, KU Leuven | "The Three Twists of N = 4, The Omega Deformation and Holography"

Mon, Apr 8, 2019, 2:30 pm

I will start by reviewing the three inequivalent topological twists of N = 4 SYM on arbitrary four-manifolds and briefly discuss the resulting topological QFTs. I will emphasise the role played by global anomalies of N = 4 in our story and the relation to anomalies in the TQFTs.

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### Biophysics Seminar: Massimo Vergassola, University of California San Diego| "Waves and flows in the early embryogenesis of Drosophila melanogaster"| Joseph Henry Room

Mon, Apr 8, 2019, 12:00 pm

Early embryogenesis of most metazoans is characterized by rapid and synchronous cleavage divisions. After fertilization, Drosophila embryos undergo 13 swift rounds of DNA replication and mitosis without cytokinesis, resulting in a multinucleated syncytium containing about 6,000 nuclei.

Audience: A free lecture open to the public.
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### HET Seminar at IAS | Anna Karlsson, Member, School of Natural Sciences, IAS | “Hydrodynamic Charge Transport: Fluctuating Stripes and Magnetophonons”

Fri, Apr 5, 2019, 1:45 pm

Charge transport near quantum critical points partly occur in phases with spontaneously broken symmetries. In an effective field theory approach, this transport can be described in a hydrodynamic theory with Goldstone modes encoding the broken symmetries. The symmetry can be restored gradually, modelling properties in the quantum critical...

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### Hamilton Colloquium Series: Marta Volonteri, IAP, "Massive Black Hole Binaries in the Cosmos" Jadwin A10

Thu, Apr 4, 2019, 4:00 pm to 5:00 pm

Massive black holes weighing from a few tens of thousands to tens of billions of solar masses inhabit the centers of today’s galaxies, including our own Milky Way. Massive black holes also shone as quasars in the past, with the earliest detected a mere billion years after the Big Bang.

Audience: A free lecture open to the public.
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### Informal HET Seminar at IAS | Minhyong Kim, Oxford University | “Some Arithmetic Path Integrals”

Wed, Apr 3, 2019, 1:45 pm
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### Pheno & Vino Seminar | David Hogg, NYU | "Imaging the dark matter with stars" | Jadwin 303

Tue, Apr 2, 2019, 4:00 pm

I discuss ways in which we might make very precise measurements of the dark matter in the Milky Way using kinematic and composition data on stars from the ESA Gaia Mission and spectroscopic surveys like SDSS-IV and -V.

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