November 30, 2021 Tuesday 11:00 AM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Modjaz Modjaz
November 30, 2021 Tuesday 2:00 PM
+
Zoom
Astrophysics and Relativity Seminars
(
astro)
Kathryn Kreckel
Heidelberg University
Mapping the Ionized ISM in nearby galaxies
The ionized interstellar medium ISM provides crucial insights into understanding baryon cycling within disk galaxies and tracing radiative and mechanical feedback from young massive stars. With new VLT/MUSE optical integral field spectroscopy, the PHANGS team now has a wealth of emission line maps that trace different ionization sources and physical conditions across 19 nearby disk galaxies at the 50pc spatial scales needed to isolate individual ionized regions e.g. HII regions, supernova remnants, planetary nebulae from surrounding diffuse ionized gas. Together with dedicated HST and ALMA observations, providing characterization of the young star clusters and giant molecular clouds, we can now explore a comprehensive view of the chemo-dynamical evolution of the star formation process across different environments. I will present our most recent results measuring the gas phase oxygen abundances across thousands of HII regions, and quantifying the mixing and feedback processes that we observe. Within the context of the large scale galactic environment, these studies have implications for our understanding of how spiral structure acts to organize and mix the ISM, and regulate star formation.
November 30, 2021 Tuesday 2:00 PM
+
Hybrid: CQP room 1067 or Zoom
Center for Quantum Phenomena Seminars
(
cqp)
Alexander Wietek
Center for Computational Quantum Physics (CCQ), Simons Foundation
Mott Insulating States with Competing Orders in the Triangular Lattice Hubbard Model
The physics of the triangular lattice Hubbard model exhibits a rich phenomenology, ranging from a metal-insulator transition, intriguing thermodynamic behavior, and a putative spin liquid phase at intermediate coupling, ultimately becoming a magnetic insulator at strong coupling. We combine a finite-temperature tensor network method, minimally entangled thermal typical states (METTS), with two Green function-based methods, connected-determinant diagrammatic Monte Carlo (DiagMC) and cellular dynamical mean-field theory (CDMFT), to establish several aspects of this model. We elucidate the evolution from the metallic to the insulating regime from the complementary perspectives brought by these different methods. We compute the full thermodynamics of the model on a width-4 cylinder using METTS in the intermediate to strong coupling regime. We find that the insulating state hosts a large entropy at intermediate temperatures, which increases with the strength of the coupling. Correspondingly, and consistently with a thermodynamic Maxwell relation, the double occupancy has a minimum as a function of temperature which is the manifestation of the Pomeranchuk effect of increased localisation upon heating. The intermediate coupling regime is found to exhibit both pronounced chiral as well as stripy antiferromagnetic spin correlations. We propose a scenario in which time-reversal symmetry broken states compete with nematic, lattice rotational symmetry breaking orders at lowest temperatures.
References:
[1] A. Wietek, R. Rossi, F. Šimkovic IV, M, Klett, P. Hansmann, M. Ferrero, E. M. Stoudenmire, T. Schäfer, A. Georges, Phys. Rev. X 11, 041013 (2021)
[2] A. Wietek, Y.-Y. He, S. R. White, A. Georges, and E. M. Stoudenmire, Phys. Rev. X 11, 031007 (2021)
December 1, 2021 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
High Energy Physics Seminars
(
hep)
Edoardo Vitagliano
UCLA
Axion-like particle dark matter and gravitational waves from topological defects
Axion-like particles (ALPs) are a compelling candidate for dark matter (DM). Their production is associated with the formation of a string-wall network. If stable, this system must annihilate, producing gravitational waves and non-relativistic ALPs. In my talk, I will show that these gravitational waves, when produced at temperatures below 100 eV, could be detected by future cosmological probes for ALPs with mass from 10^−16 to 10^+6 eV, opening a window on ALP DM with arbitrary small couplings to the Standard Model.
December 1, 2021 Wednesday 2:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Astroparticle Group Meet
December 1, 2021 Wednesday 2:00 PM
+
Hybrid: 726 Bdwy, 871 and Zoom
Soft Condensed Matter Seminars
(
csmr)
Rob Phillips
Caltech
A Language Whose Characters are Triangles
https://nyu.zoom.us/j/93506405032
December 1, 2021 Wednesday 4:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Modjaz Modjaz
December 2, 2021 Thursday 4:00 PM
+
Hybrid: 726
Broadway 940 or Zoom
Physics Colloquia
(
colloquia)
Eva Silverstein
Stanford University
The Cosmological Horizon, Macrostates, and Microstates
The cosmological horizon plays a key role in cosmology. In the early universe, it creates perturbations seeding structure starting from super-horizon modes created during inflation. Current and future observational data contains a wealth of information about this nearly-Gaussian state of the macroscopic field modes (with many interesting challenges involved in extracting it). The horizon also plays a central role in thought experiments going back to work of Gibbons and Hawking. Their calculations indicated an emergent picture of spacetime in which the horizon area in units of the Newton constant corresponds to an entropy, suggesting a corresponding count of microstates. Combining several disparate developments in theoretical physics to be introduced in the talk, we will present recent results reproducing this microstate count along with the emergent de Sitter geometry in a tractable model, raising many new questions for further research.
December 3, 2021 Friday 1:00 AM
+
Hybrid: Room 802 or Zoom
Center for Quantum Phenomena Seminars
(
cqp)
Andrew Higginbotham
Institute of Science and Technology, Austria
Probing Quantum Materials with Circuit Quantum Electrodynamics
I will discuss two initial experiments in my group’s effort to probe quantum materials with circuit quantum electrodynamics.
In the first experiment, we use coplanar waveguide resonators to probe superconductivity in a two-dimensional Al-InAs hybrid system. Our observations qualitatively agree with a theory of induced p±ip pairing that evolves into Bogoliubov-Fermi arcs at high magnetic field.
In the second experiment, we study arrays of high-impedance Josephson junctions as a model system for the superconductor-insulator phase transition. Theory predicts that such chains should be insulating, but in experiment superconducting behavior is often observed. Fixing all parameters from microwave measurements, we find that apparent superconducting behavior can be quantitatively understood as the high-temperature fate of a melted insulator.
December 3, 2021 Friday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Special Seminar
Alessandro Sfondrini
Padua University and Princeton, Inst. Advanced Studies
AdS3/CFT2 and Integrability
Computing non-protected observables in AdS/CFT in presence of RR background fluxes is notoriously hard. For the spectrum of integrable backgrounds, Bethe ansatz techniques provide a framework for doing so. For correlation functions, the hexagon formalism is a promising new approach. I will review how both these techniques can be applied to the AdS3/CFT2 correspondence, and how this can complement the worldsheet-CFT techniques that can be used for WZW models.
The talk will be on the blackboard. It will be an overview and will not assume expertise in integrability techniques.
December 6, 2021 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Jack Donahue
New York University
December 7, 2021 Tuesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Diana Powell
Harvard/Smithsonian Center for Astrophysics
December 8, 2021 Wednesday 2:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Astroparticle Group Meet
December 8, 2021 Wednesday 4:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Modjaz Modjaz
December 9, 2021 Thursday 9:00 AM
+
Flatiron Institute
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Gotham Fest
Various Various
Flatiron Institute
Gotham Fest 2021
Further Details TBA. Location: Flatiron Institute
December 9, 2021 Thursday 4:00 PM
+
Hybrid: 726
Broadway 940 and Zoom
Physics Colloquia
(
colloquia)
Jason Alicea
Caltech
A Spin on Topological Quantum Computing
Certain exotic phases of matter can give birth to emergent particles dubbed ‘anyons’ that behave strikingly differently from bosons and fermions. Laboratory exploration of anyons promises to not only reveal novel facets of quantum mechanics, but also pave the way to intrinsically fault-tolerant quantum computing hardware. Recent experiments spotlight spin-orbit-coupled magnetic insulators as an enticing potential anyon platform. Due to their insulating character, however, the roadmap from initial experiments to applications in this setting needs to be written essentially from scratch. In this talk I will partially fill in this roadmap by proposing strategies for creating, detecting, and manipulating anyons in magnetic insulators. I will also highlight arrays of Rydberg atoms as a complementary anyon venue amenable to similar techniques.
December 10, 2021 Friday 9:00 AM
+
Flatiron Institute
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Gotham Fest
Various Various
Flatiron Institute
Gotham Fest 2021
Further Details TBA. Location: Flatiron Institute
December 13, 2021 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Neal Weiner
New York University
Phenomonal phenomena in pheno
December 13, 2021 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Yosi Gelfand
New York University Abu Dhabi
(Trying to) Understand the pc-scale Radio Emission of Radio Quiet Quasars
December 14, 2021 Tuesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Justin Read
University of Surrey
December 15, 2021 Wednesday 2:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Astroparticle Group Meet
December 15, 2021 Wednesday 3:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
December 15, 2021 Wednesday 4:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Modjaz Modjaz
December 22, 2021 Wednesday 2:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Astroparticle Group Meet
December 22, 2021 Wednesday 4:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Modjaz Modjaz
December 29, 2021 Wednesday 2:00 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Astroparticle Group Meet
February 3, 2022 Thursday 4:00 PM
+
726
Broadway 940
Physics Colloquia
(
colloquia)
Andrea Young
University of California Santa Barbara
TBA
February 14, 2022 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Chris Pedersen
New York University
Neutrino mass constraints from the Lyman-alpha forest
February 17, 2022 Thursday 4:00 PM
+
Zoom
Physics Colloquia
(
colloquia)
David Hsieh
Caltech
TBA
February 22, 2022 Tuesday 2:00 PM
+
726
Broadway, CQP room #1067
Center for Quantum Phenomena Seminars
(
cqp)
Zhiyuan Sun
Harvard University
TBA
February 24, 2022 Thursday 4:00 PM
+
726
Broadway 940
Physics Colloquia
(
colloquia)
Chanda Prescod-Weinstein
University of New Hampshire
TBA
March 1, 2022 Tuesday 2:00 PM
+
726
Broadway, CQP room #1067
Center for Quantum Phenomena Seminars
(
cqp)
So Takei
CUNY
TBA
March 29, 2022 Tuesday 2:00 PM
+
726
Broadway, CQP room #1067
Center for Quantum Phenomena Seminars
(
cqp)
Michael Kolodrubetz
University of Texas at Dallas
TBA
April 28, 2022 Thursday 4:00 PM
+
726
Broadway 940
Physics Colloquia
(
colloquia)
Edward Witten
IAS
TBA
