Macromolecular protein complexes perform essential biological functions across life forms. The assembly of such complexes is known to be regulated at the level of gene transcription, but little is known about the factors that control their assembly once the mature protein subunits enter their target space (cytoplasm, membrane, or cell wall).

# Events Archive

## Events Archive

### Biophysics Seminar: Navish Wadhwa, Harvard University:Environmentally regulated self-assembly of the bacterial flagellar motor| Joseph Henry Room

### HET Seminar | Alexei Kitaev, Caltech | “Topological Quantum Phases” | Bloomberg Lecture Hall

I will discuss topological classification of gapped many-body Hamiltonians and their ground states in dimension d. In general, the problem is too hard as it includes diverse phenomena such as degenerate ground states on the torus, anyons, and fractons.

### Gravity Group Lunch Seminar, Satoru Takakura | IPMU (Dicke Candidate) "Measurements of CMB polarization with the polarization modulation technique"

Abstract:

### Hamilton Colloquium Series, Thierry Mora,Ecole Normale Supérieure de Paris, "Diversity and Memory in Self-Organised Immune Repertoires"

The immune system is composed of a large number of heterogenous interacting components that collectively recognize and clear pathogens.

### Dicke Atomic Seminar | Daniel Thrasher, U of Wisconsin | to be announced | Jadwin 303

### HEP Seminar-Dicke Candidate-Andre Frankenthal-Cornell-"Dark Matter in the Lab: Probing a Complex Dark Sector with Accelerators"

Dark matter is one of the greatest puzzles facing physics today. Our attempts to find a dark matter particle have so far come up empty-handed, and the theoretical models that have guided these efforts for the last 30 years are increasingly suspect. We still have few clues as to its nature.

### Physics Group Meeting | Sridip Pal, IAS | "Towards optimal asymptotic spectral gap in 2D unitary GFT" | Bloomberg Hall Physics Library

We will prove a conjecture [1] on upper bound of asymptotic gap in dimension in unitary compact 2D CFT, proving it to be 1 using a "extremal" function [2]. The notion of asymptotic gap can be generalized to (h, \bar{h}) plane [3].

### Pheno & Vino Seminar | Simona Murgia, UC, Irvine | "Gamma-ray observations of M31 and dark matter implications" | Jadwin 303

The Andromeda galaxy is the closest spiral galaxy to us. It harbors a massive dark matter halo which may span up to ∼600 kpc across and comprises ∼90% of the galaxy’s total mass.

### Dicke-Atomic | Zoe Yan, MIT | "From strongly interacting Bose-Fermi mixtures to ultracold dipolar molecules" | Jadwin 303

Atoms and molecules in the ultracold regime have emerged as promising platforms for quantum simulation of strongly-correlated matter. In this talk, I will describe recent progress on two fronts to study quantum many-body physics with ultracold gases. First, using ultracold fermionic atoms immersed in a Bose-Einstein condensate (BEC), we...

### HEP Seminar- Dicke Candidate-Shilo Xia-Yale-"Hunting for Neutrinoless Double Beta Decay with Liquid Xenon Detectors"

Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. In this talk, I will present the latest results from EXO-200, which searched for neutrinoless double beta decay (0υββ) in Xe-136 between 2011 and 2018.

### Gravity Group Seminar, Riccardo Gualtieri | UIUC (Dicke Candidate) "Ballooning and Experimental Cosmology"

The Cosmic Microwave Background is a unique tool to investigate the early universe and the largest structures observable in the sky. The main CMB observables such as anisotropies, polarization state and Sunyaev Zel’Dovich effect can give us a detailed view of the cosmos providing stringent constraints to the parameters of our models.

### Gravity Initiative Lunch, Antonios Tsokaros | University of Illinois "Numerical methods in general relativity and the physics of compact objects"

Every astrophysically realistic simulation needs accurate initial data and in this talk I will present methods to obtain such solutions for a variety of problems. In particular I will focus on a new initial data formulation to solve the full set of Einstein equations for spacetimes that contain a black hole under general conditions.

### Biophysics Seminar: Hana El-Samad, The University of California, San Francisco: Biological Feedback Control| Joseph Henry Room

Organisms are an evolutionary masterpiece of feedback control, featuring a mind-boggling capacity to self-correct. In this talk, we discuss our attempts to both understand feedback control in cells and to forward engineer it with de novo designed proteins.

### Gravity Group Lunch Seminar, Oliver Philcox | Princeton University "Detection and Removal of Dust Foregrounds in the B-mode CMB via Statistical Anisotropy"

Searches for inflationary gravitational wave signals in the CMB B-mode polarization are expected to reach unprecedented power over the next decade. A major difficulty in these ongoing searches is that Galactic foregrounds such as dust can easily mimic inflationary signals.

### Hamilton Colloquium Series, Steve Cowley, Princeton Plasma Physics Laboratory, "Driving Down the Cost of Fusion Power Through Technical Innovation"

The National Academy has recently called for the US to adopt a strategy to produce fusion electricity from a compact pilot plant by mid-century. This approach requires innovations in technology (e.g. magnet systems and power handling systems) and innovations in physics.

### Condensed Matter Seminar | Senthil Todadri, MIT | "Correlations and topology in graphene moire lattices" | Joseph Henry Room, Jadwin Hall

### Pheno & Vino Seminar | Prateek Agrawal, Harvard | "A CMB Millikan experiment with axion strings" | Jadwin 303

Very light axions are a generic prediction of string compactifications. If cosmic strings associated with these axions were produced in the early universe, they quickly approach a so-called scaling solution, such that strings persist in the sky today. I will present some remarkable signals of such strings coupled to photons.

### HET Seminar | Po-Shen Hsin, Caltech | "Lorentz Symmetry Fractionalizations and Dualities in (2+1)d" | Bloomberg Lecture Hall

### Gravity Initiative Lunch, Elias Most | Flatiron Institute "Constraints on nuclear physics and electromagnetic precursors from neutron star mergers"

With the detection of GW170817 we have observed the first multi-messenger gravitational wave signal from two merging neutron stars. This signal carried a multitude of information about the underlying equation of state (EOS) of nuclear matter, which so far is not known for densities above nuclear saturation.

### Biophysics Seminar: Damon Clark, Yale University: Mechanisms underlying visual illusions in flies| Joseph Henry Room

Visual systems detect many features of natural scenes, including motion. Motion detection guides critical behaviors like hunting, evading predators, and finding mates. It can be framed as an inference problem, in which light intensity measurements are combined to estimate a latent variable of image velocity.