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.

# Events Archive

## Events Archive

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

### 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...

### Gravity Initiative Lunch, Maxime Van De Moortel | Princeton "The breakdown of weak null singularities inside black holes"

Abstract: The characterization of singularities inside black holes is a fundamental problem in General Relativity. While the celebrated “mass inflation” scenario suggests that a weakly *singular* Cauchy horizon forms inside generic black holes (near time-like infinity), the global structure of the black hole interior boundary has largely...

### HET Seminar | Victor Gorbenko, Member, School of Natural Sciences, Institute for Advanced Study | "λ ϕ⁴ in dS" | Bloomberg Lecture Hall (IAS)

### Gravity Group Lunch Seminar, Zack Li & Rita Sonka | Princeton

**Zack Li, Princeton University**

"ABS, ACT, and Planck via the Simons Observatory Power Spectrum Pipeline"

### Condensed Matter Seminar | Mikhail I. Eremets, Max Planck | "Progress in high-temperature conventional superconductivity" PCTS Seminar Room 407

We studied the state of matter under extreme conditions and found new phenomena and materials, including polymeric nitrogen, transparent sodium, semimetallic hydrogen, and superconductivy in various substances.

### Mathematical Physics Seminar: Michael Kiessling, Rutgers University, "Quantization of the electromagnetic field as a consequence of old-fashioned semi-relativistic quantum mechanics of radiating atoms''

Born's probabilistic interpretation of Schroedinger's wave function is shown to lead to a semi-relativistic quantum mechanics of atoms, molecules, etc., coupled with electromagnetic radiation. No second quantization is invoked, yet the photon naturally shows up in this formulation.

### Pheno & Vino Seminar | Timothy Cohen, U of Oregon | "The Higgs Effective Theory is a Black Hole" | Jadwin 303

Treating the Standard Model as an Effective Field Theory (EFT) yields a general framework for exploring deviations in observables that probe the indirect effects of new particles. Two treatments are typically discussed --- Higgs EFT (HEFT) and Standard Model EFT (SMEFT) --- my goal in this talk is to compare and contrast them. The key...

### HET Seminar | Vladimir Kazakov, Ecole Normale Supérieure | "Conformal Fishnet Theory" | Bloomberg Lecture Hall (IAS)

"I will review the proprieties and recent results for conformal fishnet theory (FCFT) which was proposed by O.Gurdogan and myself as a special double scaling limit of gamma-deformed N=4 SYM theory. FCFT, in its simplest, bi-scalar version, is a UV finite strongly coupled 4-dimensionl logarithmic CFT dominated by planar fishnet Feynman graphs (...

### Gravity Initiative Lunch, Stephen Adler | IAS "Implications of a Frame-Dependent Dark Energy for the Spacetime Metric and "Hubble Tension""

Abstract: I discuss the possibility that the ''dark energy'' that drives the accelerated expansion of the universe arises not from a conventional cosmological constant term in the gravitational action, but rather from a frame-dependent but Weyl scaling invariant action term.

### Biophysics Seminar: Andrew York, Calico: A bolt-on single-objective light-sheet design with uncompromised numerical aperture|Joseph Henry Room

Spinning disk confocal modules are “core facility friendly”; they insert conveniently between a commercial microscope base and camera, improve image quality and add no significant drawbacks. In contrast, high numerical aperture (NA) light sheet microscopy often requires radical sample modification, substantial user re-training and fully...

### Gravity Group Seminar, Philip Mocz | Princeton University "First Galaxies in Fuzzy Dark Matter"

The near-century-old dark matter (DM) problem is one of the most intriguing mysteries in modern physics. We do not know the nature of 84% of matter in the Universe, yet it is thought to govern cosmic structure and hold galaxies and clusters together.