Events Archive

Events Archive

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

Fri, Feb 28, 2020, 12:00 pm

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

Fri, Feb 28, 2020, 11:45 am

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.

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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''

Tue, Feb 25, 2020, 4:30 pm

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.

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

Tue, Feb 25, 2020, 4:00 pm

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...

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

Mon, Feb 24, 2020, 2:30 pm

"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 (...

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

Mon, Feb 24, 2020, 12:30 pm

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

Mon, Feb 24, 2020, 12:00 pm

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...

Audience: A free lecture open to the public.
Speaker(s):

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

Fri, Feb 21, 2020, 12:00 pm

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.

SMuRF/Daq User Interface Meeting | 2nd Edition, 202 Jadwin Hall

Hamilton Colloquium Series, Luis Fernando Alday, Oxford University, "Quantum Scattering Amplitudes in AdS/CFT"

Thu, Feb 20, 2020, 4:00 pm

The AdS/CFT correspondence maps correlators of local operators in a conformal field theory to scattering amplitudes in a gravitational/string theory on curved space-time. The study of such amplitudes is incredibly hard and has mostly been done in a certain classical limit. We show how modern analytic bootstrap techniques allow us to go much...

Audience: A free lecture open to the public.
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SMuRF/Daq User Interface Meeting | 2nd Edition, JH room

Thu, Feb 20, 2020, 8:15 am
Thursday, February 20th (Room 102)

09:00 - 09:30: Light Breakfast

Condensed Matter Seminar | Helen Bouchiat, U of Paris Sud | "Revealing the second-order topological character of bismuth-based Josephson junction" | Joseph Henry Room

Wed, Feb 19, 2020, 12:00 pm

 In Second-Order Topological Insulators (SOTI), bulk and surfaces are insulating while the edges or hinges conduct current in a quasi-ideal (ballistic) way, being insensitive to disorder.  Crystalline bismuth has been shown to belong to this class of materials [1,2,3].

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Pheno & Vino Seminar | Christoph Weniger, U of Amsterdam | "Uncovering Dark Matter with Compact Objects and Automatic Differentiation" | Jadwin 303

Tue, Feb 18, 2020, 4:00 pm

The nature of dark matter (DM) in the Universe remains one of the great open questions of particle astrophysics and cosmology today. The WIMP (weakly interacting massive particle) DM paradigm has fallen, leaving us with a wide range of possible DM models and signatures. New methods and ideas are required to efficiently progress.

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The quantum sounds of electrons and the quantum noise of spinons - Inti Sodemann - Max Planck

Tue, Feb 18, 2020, 12:30 pm

The problem of strongly interacting gapless fermions above one dimension is one of the wildest open frontiers in quantum condensed matter where our understanding remains insular and embedded in vast oceans of mystery.

Audience: Free and open to the public

Real-space approach for topological states and a new principle of bulk-boundary correspondence - Zhida Song

Mon, Feb 17, 2020, 4:00 pm

Abstract: The real-space approach has been proved as a powerful method to study topological states: both the classification of topological states and that of their anomalous surfaces can be obtained in an intuitive, straightforward way. I will talk about new progress in topological materials which is inspired by, the real-space approach.

Audience: A free lecture open to the public.

Gravity Initiative Lunch, Bart Ripperda | Princeton/Flatiron "Magnetic reconnection and plasmoid formation in black hole accretion flows"

Mon, Feb 17, 2020, 12:30 pm

Hot spots, or plasmoids, formed due to magnetic reconnection in thin current sheets are conjectured to power frequent bright X-ray and near-infrared flares from supermassive black holes, like Sgr A* in the center of our Galaxy.

Cancelled. To Be Rescheduled. Biophysics Seminar: Stephanie Palmer, University of Chicago: How behavioral and evolutionary constraints sculpt early visual processing|Joseph Henry Room

Mon, Feb 17, 2020, 12:00 pm

While efficient coding has been a successful organizational principle in visual neuroscience, to make a more general theory behavioral, mechanistic, and even evolutionary constraints need to be added to this framework.

Audience: A free lecture open to the public.
Speaker(s):

Hamilton Colloquium Series, Ricard Alert, Princeton University, "The Physics of Collective Cell Migration"

Thu, Feb 13, 2020, 4:00 pm

Cells in our body move in groups during development, wound healing, and tumor spreading. Bacterial cells also coordinate their motion to aggregate into biofilms, to feed cooperatively, and to form fruiting bodies.

Audience: A free lecture open to the public.
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Mathematical Physics Seminar: Charles Newman, Courant Institute, "A Gaussian Process Related to the Mass Spectrum of the Near-Critical Ising Model"

Tue, Feb 11, 2020, 4:30 pm

The continuum scaling limit of the Ising model in d dimensions at the critical temperature whose magnetic field properly scales to zero with lattice spacing is (or should be) a non-Gaussian generalized random field Phi for d = 2 (and d = 3).

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Pheno & Vino Seminar | William Terrano, Princeton | "Direct Detection Searches for Fuzzy Dark Matter and Ultra Low Mass Axions at Princeton" | Jadwin 303

Tue, Feb 11, 2020, 4:00 pm

I will discuss experimental prospects for directly detecting ultra-low-mass dark matter, including the interesting “Fuzzy” dark matter scenario.  I will describe experiments which are ongoing here at Princeton, and the challenges associated with them.  I will also present the results we have thus far, and the prospects for future improvements...

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