Events Archive

Special Seminar - Dicke Finalist - Sam Bright-Thonney - Adventures in the LHC’s “Wild West” Era
Wed, Nov 29, 2023, 11:00 am12:00 pm

Despite a decade of careful searching, signs of new physics at the LHC remain maddeningly elusive. Without a clear frontrunner theory, a rich landscape of creative and innovative searches has emerged around two broad themes: using our detectors in unconventional ways to reconstruct challenging final states, and employing deep learning to gain…

Mathematical Physics Seminar, Tues, Nov 28, 4:30pm, Jadwin A07, Nikita Sopenko, IAS,"Anomalous Symmetries of Quantum Spin Chains and Generalization of Lieb-Schultz-Mattis Theorem"
Tue, Nov 28, 2023, 4:30 pm5:30 pm

I will discuss how symmetries of quantum spin systems can be realized. For a given realization of a symmetry group G of a 1d spin system, I will define the anomalous index that takes values in the cohomology H^4(BG) of the classifying space of the group. I will show that a G-invariant system with a non-trivial anomalous index can not have a…

Speaker
Dark Cosmos Seminar - The quest for dark matter with LZ, a US flagship experiment - Joseph Henry - 4PM
Tue, Nov 28, 2023, 4:00 pm5:00 pm

LUX-ZEPLIN (LZ) is a direct detection dark matter experiment currently being operated at the Sanford Underground Research Facility (SURF) in Lead, South Dakota. The experiment utilizes a dual phase time projection chamber (TPC)  to primarily look for dark matter in the form of Weakly Interacting Massive Particles (WIMPs). The active TPC…

Speaker
Special Seminar - Dicke Finalist - Elena Michelle Villhauer - Defying 4D Gravity: Novel searches for signatures of string theory via scalar cascades, noncommutative black holes, non-minimal dark sectors, and deep learning
Tue, Nov 28, 2023, 2:00 pm3:00 pm

The existence of extra dimensions could lower the fundamental Planck scale to the low TeV scale and very excitingly allow string theory to be probed at the LHC. This talk introduces novel searches for signatures of string theory via three models that have never been searched for by any experiment: scalar cascades, noncommutative black holes,…

Dicke Candidate - Jiaqui Cai - Engineer topological flat bands in two-dimensional quantum materials - Jadwin 343 - 2 PM
Mon, Nov 27, 2023, 2:00 pm3:00 pm

Condensed matter physicists understand the universe by tracking collective motions of elementary particles, or quasiparticles, many of which parallel elementary particles in the Standard Model. However, the principle of fractionalization uncovers quasiparticles with no Standard Model counterpart. A seminal example is the fractional quantum Hall…

Speaker
Faculty, post docs, grads
Biophysics Seminar: Tatiana Engel | Princeton University | The dynamics and geometry of choice in premotor cortex
Mon, Nov 27, 2023, 12:30 pm1:30 pm

Neural responses in association brain areas during cognitive tasks are heterogeneous, and the widespread assumption is that this heterogeneity reflects complex dynamics involved in cognition. However, the complexity may arise from a fundamentally different coding principle: the collective dynamics of a neural population encode simple…

Speaker
A free lecture open to the public.
Princeton Gravity Initiative - Global stability of the Kaluza - Klein spacetime - Annalaura Stingo (École Polytechnique Paris)
Mon, Nov 27, 2023, 12:30 pm1:30 pm

The Kaluza-Klein theories represent the classical mathematical approach to the unification of general relativity with electromagnetism and more generally with gauge fields. In these theories, general relativity is considered in 1+3+d dimensions and in the simplest case d=1 dimensional gravity is compactified on a circle to obtain at low…

Faculty, Postdocs, graduate students
Dark Cosmos Seminar - Dumb Machine Learning for Physics - Joseph Henry - 4 PM
Tue, Nov 21, 2023, 4:00 pm5:00 pm

Machine learning is now a part of physics for the foreseeable future, but many deep learning tools, architectures, and algorithms are imported from industry to physics with minimal modifications. Does physics really need all of these fancy techniques, or does “dumb” machine learning with the simplest possible neural network suffice? The answer…

Speaker
IAS HET Seminar | Martijn Wijnholt, University of Pennsylvania | “The M-theory Three-Form and ADE Gauge Symmetry” | Bloomberg Lecture Hall (IAS) & Zoom
Mon, Nov 20, 2023, 2:30 pm3:30 pm

M- and F-theory compactifications with ADE singularities give rise to non-abelian ADE gauge symmetries. The physical explanation for this phenomenon involves M2-branes wrapped on vanishing cycles. We consider an alternative approach which relies on relating the M-theory three-form to the Chern-Simons form of a bundle, and allows us to address…

Special Seminar w/Dicke Candidate Yunyang Li (JHU) " Accessing the largest-scale microwave polarization with the Cosmology Large Angular Scale Surveyor (CLASS) ", Nov 20 2023 at 2:00pm, JH Room
Mon, Nov 20, 2023, 2:00 pm3:00 pm

Cosmic microwave background polarization on large angular scales contains distinct signals from the epoch of reionization and the primordial gravitational waves, offering promising avenues to probe the neutrino masses and inflation physics. However, ground-based measurements are plagued by atmospheric interference, making this task challenging…

HET Seminar |Jnan Maharana; Institute of Physics, Bhubaneswa | “ IS THE SCATTERING AMPLITUDE ANALYTIC IN A FIELD THEORY WITH A COMPACT SPATIAL COORDINATE?” | PCTS
Fri, Nov 17, 2023, 11:00 am12:00 pm

Khuri, in 1995, considered potential scattering for a model where one spatial coordinate in compactified on the circle. He adopted Greens function method to study analyticity property of scattering amplitude. His conclusion was that forward scattering amplitude does not satisfy dispersion relations in certain cases;…

Machine Learning Seminar | Phiala Shanahan, MIT | “Machine learning for sampling high-dimensional probability distributions in lattice field theory” | Jadwin A10
Wed, Nov 15, 2023, 4:30 pm5:30 pm

As machine learning algorithms continue to enable and accelerate physics calculations, the development of problem-specific physics-informed machine learning approaches is becoming more sophisticated, impactful, and important. I will describe recent advances in generative modelling emerging from the challenge of…

Dark Cosmos Seminar - Searching for Light Dark Matter with the DarkSide Program - Chair's Conf. room - 3:30 PM
Wed, Nov 15, 2023, 3:30 pm4:30 pm

Dark matter is a hypothetical matter in the universe introduced to coherently explain observations ranging from the scale of galaxies to the whole of the universe. The DarkSide program is a direct dark matter detection experiment that utilizes dual-phase argon time projection chambers. Its preceding experiment, DarkSide-50, has set the…

Speaker
Towards a muon collider - Federico Meloni - (DESY)
Wed, Nov 15, 2023, 1:45 pm3:15 pm

Muon colliders are an unprecedented opportunity for high-energy physics. They can provide collisions of point-like particles at very high energies and open the path to a vast physics programme. Their strong physics potential is accompanied by intriguing technological challenges, due to the fact that muons are unstable particles. For example,…

Condensed Matter Seminar - Integer and Fractional Quantum Anomalous Hall Effects in Graphene - Jadwin Hall A09 - 12PM
Wed, Nov 15, 2023, 12:00 pm1:30 pm

The fractional quantum anomalous Hall effect (FQAHE), the analog of the fractional quantum Hall effect at zero magnetic field, is predicted to exist in topological flat bands under spontaneous time-reversal-symmetry breaking. The demonstration of FQAHE could lead to non-Abelian anyons which form the basis of topological quantum computation…

Speaker
Special Seminar - Unconventional Orders in Kagome Metals - GI Space - 5PM
Tue, Nov 14, 2023, 5:00 pm6:30 pm

Three important driving forces for creating qualitatively new phases in quantum materials are the topology of the materials’ electronic band structures, frustration in the electrons’ motion or magnetic interactions, and strong correlations between their charge, spin, and orbital degrees of freedom. In very few material systems do all of these…

Speaker
Mathematical Physics Seminar, Tues, Nov 14, 4:30pm, Jadwin A07, Michael I. Weinstein, Columbia / Princeton / IAS,"Pseudo-magnetism and Landau Levels in Deformed Honeycomb Structures"
Tue, Nov 14, 2023, 4:30 pm5:30 pm

A non-uniform deformation of a honeycomb medium induces effective-magnetic and effective-electric fields. One may choose a deformation which gives rise to a constant perpendicular effective-magnetic field with Landau-level spectrum (flat bands). In the setting of photonic crystals, the tight binding model is generally not applicable. I’ll…

Speaker
Hamilton Colloquium Series, Eva Silverstein, Stanford, "Quantum Macrostates and Microstates of the Cosmological Horizon", Nov 14, Jadwin A10
Tue, Nov 14, 2023, 4:00 pm5:00 pm

The accelerated expansion of the universe leads to a horizon beyond which we cannot see.   Structure arises from the quantum variance of early universe fields stretched across the horizon, according to the simplest theory fitting observations.  In concrete new models in string- (or `M-’) theory, the accelerating universe itself…

A free lecture open to the public.
Dark Cosmos Seminar - Machine Learning for Neutrino Cross Section Modeling - Joseph Henry - 4 PM
Tue, Nov 14, 2023, 4:00 pm5:30 pm

Cross-section predictions are crucial for the success of long-baseline neutrino experiments, but they suffer from significant theoretical uncertainties. Given the promise of future near detector data, one certainly expects and needs to utilize such data to improve cross-section modeling. We want to explore this idea to its fullest extent by…

Speaker
Biophysics Seminar: Nikhil Malvankar | Yale University | How Do Electric Bacteria Breathe Without Oxygen or Soluble Electron Acceptors? Protein Nanowires: Structures, Functions, and Ultrafast Electron Transfer Mechanisms
Mon, Nov 13, 2023, 12:30 pm1:30 pm

Deep in the ocean or underground, where there is no oxygen, Geobacter “breathe” by projecting tiny hair-like protein filaments called "nanowires" into the soil, to dispose of excess electrons resulting from the conversion of nutrients to energy, cleaning up radioactive sites. Although it is long known that Geobacter

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A free lecture open to the public.