The study of small experimental communities has been key to the development of ecology as a discipline. Yet, for most ecological communities, the number of experiments required to build, model, or analyze the system vastly exceeds what is feasible, rendering these communities experimentally intractable.

# Events Archive

## Events Archive

### Gravity Initiative Lunch, Matthew Heydeman | Princeton GI

### Canceled-Biophysics Seminar: Stefano Allesina, The University of Chicago: Predicting coexistence in ecological communities| Joseph Henry Room

### HET Seminar | Henry Lin, Princeton University | "Solving Random Matrix Models with Positivity” | via ZOOM

To connect to the HET Seminar via Zoom, please do the following:

1 - If you have Zoom installed on your device, enter the following meeting ID: 730333408

click Join Meeting.

### Pheno & Vino | JiJi Fan, Brown University | "Direct detection experiments in the Gaia era" | via Zoom

The advent of the Gaia era has led to potentially revolutionary understanding of dark matter dynamics in our galaxy, which has important consequences for direct detection experiments. In this talk, I will discuss the effects of various dark matter substructures inferred from the Gaia data on possible direct detection signals at next-generation...

### Gravity Initiative Lunch, Lia Medeiros | IAS

### Canceled-Biophysics Seminar: Na Ji, University of California, Berkeley: Imaging the brain at high spatiotemporal resolution|Joseph Henry Room

To understand computation in the brain, one needs to understand the input-output relationships for neural circuits and the anatomical and functional relationships of individual neurons therein.

### HET Seminar | Adam Levine, Member, School of Natural Sciences, Institute for Advanced Study | “How to See Everything in the Entanglement Wedge” | via Zoom

To connect to the HET Seminar via Zoom, please do the following:

1 - If you have Zoom installed on your device, enter the following meeting ID: 430399907

click Join Meeting.

### HET Seminar | Daniel Harlow, MIT | "Convariant Phase Space with Boundaries" | via ZOOM

**Description:**

### Canceled-Biophysics Seminar: Allan Drummond, University of Chicago: Evolution of low-complexity protein regions implicated in biomolecular condensation|Joseph Henry Room

### Gravity Group Lunch Seminar, Daniel Dutcher | U. Chicago “Measuring the Polarization of the CMB with SPT-3G”

Observations of the cosmic microwave background form the pillar of our current understanding of cosmology. Measurements of the temperature and polarization anisotropies of the CMB extending to small angular scales set tight constraints on cosmological parameters, probing both the standard LCDM model and the physics of inflation.

### Condensed Matter Seminar | Adrian Po, MIT | "Symmetry indicators for topological superconductors" | Joseph Henry Room, Jadwin Hall

A useful guiding principle for the search of topological superconductors is to relate the topological invariants with the behavior of the pairing order parameter on the normal-state Fermi surfaces. In this talk, we will discuss how this paradigm can be integrated with the notion of symmetry indicators, which enables an efficient diagnosis of...

### Mathematical Physics Seminar: Marius Lemm, Harvard University, "Spectral Gaps in Quantum Spin Systems"

Quantum spin systems are many-body models which are of wide interest in modern physics and at the same time amenable to rigorous mathematical analysis. A central question about a quantum spin system is whether its Hamiltonian exhibits a spectral gap above the ground state.

### Pheno & Vino | Prasnth Shyamsundar, U of Florida | "Quantum computing and machine learning in high energy data analysis" | Jadwin 303

Recently there has been a growing interest in the application of quantum computing and machine learning in many scientific disciplines, including high energy physics. In the first half of this talk, we will look at a novel quantum computing based technique to search for unmodeled deviations from a simulated expectation in high-dimensional...

### Gravity Initiative Lunch, Martin Lesourd | Harvard BHI “ The Quasi-Local Penrose Inequality and the Hoop Conjecture”

The Spacetime Inequality of Penrose 1972 says that any slice in any black hole spacetime, the ADM mass of the slice is bounded below by the area of cuts with the event horizon.

### Biophysics Seminar: Andreas Gahlmann, University of Virginia: Visualizing Bacterial Physiology at High Resolution using Single-Molecule Tracking and Lattice-Light Sheet Microscopy |Joseph Henry Room

Our lab develops new imaging approaches for visualizing bacterial physiology in relevant contexts: We use live-cell single-molecule localization microscopy and lattice-light sheet microscopy to access 3D spatial and temporal information with high resolution.

### HET Seminar | Silviu Pufu, Princeton University | "Modular invariance in superstring theory from N=4 super-Yang-Mills" | PCTS, Jadwin 407

In this talk, I will first review some of the recent progress on computing holographic correlators using analytic bootstrap techniques combined with supersymmetric localization, focusing on the case of the N = 4 super-Yang-Mills theory.

### Gravity Group Lunch Seminar, Justin Ripley & Joseph van der List | Princeton

**Justin Ripley, Princeton University** "Modeling the 'ringdown' of a Kerr black hole"

### Princeton Physics March Meeting 2020

In response to the cancelled APS March Meeting, postdocs and graduate students will be hosting a "virtual" **Princeton Physics March Meeting **this **Thursday, March 5, from 9 a.m. - 5 p.m.** in PCTS seminar room 407.

### Mathematical Physics Seminar: Ian Jauslin, Princeton University, "A Simplified Approach to Interacting Bose Gases"

I will discuss some new results about an effective theory introduced by Lieb in 1963 to approximate the ground state energy of interacting Bosons at low density. In this regime, it agrees with the predictions of Bogolyubov. At high densities, Hartree theory provides a good approximation.

### Pheno & Vino Seminar | Alexander Mitov, Cavendish Lab, Cambridge | "The 2 to 3 Frontier in NNLO LHC calculations" | 303 Jadwin Hall

For the last 5 years or so, there has been a major effort towards the calculation of two-loop 5-point QCD amplitudes and their corresponding LHC cross-sections at NNLO. Very recently, the first such calculation - 3-photon production - was completed [arXiv:1911.00479]. I will explain the novel features, and lessons learned, in regard to 5-point...