Abstract: Dark matter could be a thermal relic of freeze-in, where the dark matter is produced by extremely feeble interactions with Standard Model particles dominantly at low temperatures.

# Events Archive

## 2018

### Pheno & Vino Seminar | Katelin Schutz, Berkeley | “Cosmological signatures of sub-MeV dark matter freeze-in”| Jadwin 303

### Biophysics Seminar: Benjamin Lovegren de Bivort, Harvard University "The neural circuit basis of behavioral individuality"| Joseph Henry Room

### Special Gravity Initiative Seminar, Fernando Zago (University of Pittsburgh) "Quantum Particle Production Effects on Cosmic Evolution"

Abstract: Quantum fields living on cosmological spacetimes can experience particle production due to their interaction with the evolving background. This effect is particularly relevant for models of the very early Universe, when the energy density generated through this process may back-react on the cosmological expansion.

### HET Seminar at IAS | Ying Zhao, School of Natural Sciences, IAS | “Falling Toward Charged Black Holes”

I'll talk about the size-momentum correspondence and use it to study scrambling in a near-extremal charged black hole. Its based on the paper arXiv:1804.04156v4.

### Gravity Group Lunch Seminar, Jeff Filippini (Illinois) "Cosmic rays in TES arrays: lessons from SPIDER and the lab"

Integrated arrays of transition-edge sensor (TES) bolometers have brought unprecedented sensitivity to measurements of the cosmic microwave background (CMB). Similar arrays are a crucial enabling technology for a number of future space-based missions in the millimeter and far-infrared bands.

### Tensor Gauge Theories of Fractons - Michael Pretko, University of Colorado

Abstract: A fracton is an unusual new type of emergent quasiparticle, first proposed in the context of quantum phases of matter, which does not have the ability to move by itself. Rather, fractons can only move by forming certain bound states. In this talk, I will show that symmetric tensor gauge theories provide a natural theoretical...

### Hamilton Colloquium Series:Nai Phuan Ong, Princeton University, "The Chiral Anomaly in Dirac Semimetals" Jadwin A10

I will talk about recent experiments on the chiral anomaly in Dirac semimetals. In field theory, Dirac fermions of zero mass must segregate into left- and right-handed populations that do not ever mix. In this limit, chiral symmetry (handedness) is a global symmetry of the Lagrangian. However, quantum effects induced by coupling to a vector...

### Physics Group Meeting at IAS | Tom Rudelius, School of Natural Sciences, IAS | “Mapping the Swampland”

I will introduce the notion of the Swampland, first defined in 0509212/hep-th.

### Pheno & Vino Seminar | Hongwan Liu, MIT | "From the Table-Top to the Cosmos: Searching High and Low for Dark Matter" | Jadwin 303

Abstract: In this talk, I will explore two recent developments in the search for dark matter. First, I will discuss how the 21-cm global signal measurement constrains the potential impact of dark matter annihilation/decay on the thermal history of the universe.

### HET Seminar at IAS | Daniel Jafferis, Harvard University | “Stringy ER=EPR”

### HET Seminar | Gabor Sarosi, UPenn & University of Brussels | "Boundary dual of the bulk symplectic form and the volume of maximal slices" | PCTS Seminar Room

In this talk, I will explain how to understand the symplectic structure of the gravitational phase space in AdS in terms of the quantum overlap in the holographically dual CFT. As an application, I will use this to study the boundary description of the volume of maximal Cauchy slices.

### HET Seminar at IAS | Katrin Becker, School of Natural Sciences & Texas A&M University | "M-theory in 4D, N=1 Superspace"

I report on progress in formulating eleven-dimensional supergravity in a framework in which four supersymmetries are manifest.

### Gravity Group Lunch Seminar, Victor Buza (Harvard) "Constraining Primordial Gravitational Waves Using Present and Future CMB Polarization Experiments"

**Abstract:** Finding direct evidence of Primordial Gravitational Waves (PGWs) is one of the most exciting and important goals in fundamental physics today. The polarized light of the Cosmic Microwave Background (CMB) provides a powerful dataset from which we may detect PGWs and draw quantitative conclusions about the early...

### Hamilton Colloquium Series: Gregory Falkovich, Weizmann Institute of Science, "Wonders of Viscous Electronics" Jadwin A10

Quantum-critical strongly correlated systems feature universal collision-dominated collective transport. Viscous electronics is an emerging field dealing with systems in which strongly interacting electrons flow like a fluid. Such flows have some remarkable properties never seen before.

### Special Condensed Matter Seminar | Cheng Ju Lin, Caltech | "Exact Strong-ETH Violating Eigenstates in the Rydberg-blockaded Atom Chain" | PCTS Seminar Room 407

Abstract: A recent experiment in the Rydberg atom chain observed unusual oscillatory quench dynamics with a charge density wave initial state, and theoretical works identified a set of many-body ``scar states'' in the Hamiltonian as potentially responsible for the atypical dynamics.

### Gravity Initiative Seminar, Eliu Huerta (UIUC) "Frontiers in Multi-Messenger Astrophysics: Harnessing the Data Revolution with Gravitational Wave Astrophysics and Large Scale Astronomical Surveys"

Abstract: The convergence of gravitational wave astrophysics, large scale astronomical surveys, deep learning and large scale computing provide an emergent paradigm to fully realize Multi-Messenger Astrophysics.

### Physics Group Meeting at IAS | Edward Witten, School of Natural Sciences, IAS | “Nonsupersymmetric D-branes”

These were originally discovered by Sen (see hep-th/9808141, hep-th/9809111, hep-th/9904207, for example). Another interesting paper is by Kraus and Larsen, hep-th/0012198.

I will describe a new perspective based on anomalies.

### Math Physics Seminar | Ian Jauslin, Princeton | "Field electron emission and the Fowler-Nordheim equation" | Jadwin 343

Consider a metallic field emitter shaped like a thin needle, at the tip of which a large electric field is applied. Electrons spring out of the metal under the influence of the field. The celebrated and widely used Fowler-Nordheim equation predicts a value for the current outside the metal.

### Pheno & Vino Seminar | Liam Fitzpatrick, Boston U. | "Conformal Field Theory, Hamiltonian Truncation, and You" | Jadwin 303

Abstract: Conformal Field Theories (CFTs) have a highly constrained structure that make them much more tractable, especially at strong coupling, than generic QFTs. An appealing picture for more general QFTs is as points along the RG flow from a UV CFT. We discuss conformal truncation as a method for nonperturbatively following such RG flows...