CCPP events include astrophysics seminars, high energy seminars, experimental particle physics (hep-ex) seminars, Colloquium, CCPP Brown Bag, and some group meetings, informal talks, etc.. Events can be viewed with Events Daily,  Events List or Events Calendar format.

Upcoming Events

ASTRO Journal Club
Event Type: Other
Date: Tuesday, November 29, 2022
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

Resonant Friction on discs in galactic nuclei
Yuri Levin, Columbia University
Event Type: Astro Seminar
Date: Tuesday, November 29, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: Statistical physics has a bad track record in describing large-N gravitational systems. It has become clear over the last several years that there is a remarkable exception to this rule. Resonant relaxation due to orbit-averaged secular dynamics in galactic nuclei drives them to states of thermal and rotational equilibria on an astronomically short timescale. There are fun applications: phase transitions leading to lopsided precessing equilibria (similar-looking to the nucleus of Andromeda), and strong clustering in eccentricity and inclination of stellar-mass black holes. Following Rauch and Tremaine, I will use statistical physics to argue that secular-dynamical "resonant friction" must exist and that moreover, it likely plays a huge role in galactic nuclei. It controls the dynamics of Intermediate-Mass Black Holes as well as that of stellar and accretion discs. The young stellar disc at the center of our Galaxy presents a good case study for this effect.

HEP Journal Club
Event Type: Other
Date: Wednesday, November 30, 2022
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

Non-invertible Symmetries in Nature
Shu-Heng Shao, Stony Brook
Event Type: HEP Seminar
Date: Wednesday, November 30, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: In massless QED, we find that the classical U(1) axial symmetry is not completely broken by the Adler-Bell-Jackiw anomaly. Rather, it is resurrected as a generalized global symmetry labeled by the rational numbers. Intuitively, this new global symmetry in QED is a composition of the naive axial rotation and a fractional quantum Hall state. The conserved symmetry operators do not obey a group multiplication law, but a non-invertible fusion algebra. We further generalize our construction to QCD, and show that the neutral pion decay can be derived from a matching condition of the non-invertible global symmetry. Finally, we find a non-invertible Gauss law in axion-Maxwell theory.

Graduate Student Town Hall
Event Type: Other
Date: Thursday, December 1, 2022
Time: 10:00 AM - 11:15 AM
Location: 726 Broadway, 940, CCPP Seminar

Facilitating Thinking and Learning In and Beyond the Physics Classrooms using Research-based Approaches
Chandralekha Singh, University of Pittsburgh
Event Type: Physics Dept Colloquium
Date: Thursday, December 1, 2022
Time: 4:00 PM -
Location: Talk by Zoom
Abstract: I will discuss, using my research in physics education, how research can be used as a guide to develop curricula and pedagogies to reduce student difficulties and for making physics equitable and inclusive. I will also discuss innovations in teaching and learning methods for physics after the new normal using my research conducted during emergency remote teaching and lessons learned that can be valuable for innovation in teaching and learning going forward. My research has focused on improving student understanding of introductory and advanced concepts. We are developing research-validated learning tools such as tutorials and peer instruction tools that actively engage students in the learning process. I will discuss how we evaluate the effectiveness of these tools using a variety of methodologies and then describe our research studies that provide guidelines for how to enhance physics by making it inclusive. Finally, I will discuss how a field-tested short intervention was implemented at the beginning of a physics course and how it improved the performance of underrepresented students in introductory physics classes compared to the comparison group.

Quantum-Group Group Meeting
Event Type: Other
Date: Friday, December 2, 2022
Time: 1:00 PM - 2:15 PM
Location: 726 Broadway, 902, Lg Conf

To Be Determined
Isabel Garcia Garcia, New York University
Event Type: CCPP Brown Bag
Date: Monday, December 5, 2022
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

tba
Lingfeng Li, Brown
Event Type: Informal HEP Talk
Date: Monday, December 5, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

Grad Pheno Journal Club
Event Type: Grad Pheno Journal Club
Date: Monday, December 5, 2022
Time: 3:30 PM - 4:30 PM
Location: 726 Broadway, 902, Lg Conf

ASTRO Journal Club
Event Type: Other
Date: Tuesday, December 6, 2022
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

Gravitational Waves: Astrophysics with the LIGO/VIRGO data Gravitational Waves: Astrophysics with the LIGO/VIRGO data Gravitational Waves: Astrophysics with the LIGO/VIRGO data
Matias Zaldarriaga, Institute for Advanced Studies
Event Type: Astro Seminar
Date: Tuesday, December 6, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: I will describe some of our recent work re-analyzing the gravitational wave data made public by the LIGO collaboration. More broadly I will discuss some of the outstanding questions related to binary black hole mergers and what the data might be saying about how the GW sources formed. I will comment on some fruitful directions for further improvements.

HET Discussion Session
Zare
Event Type: Other
Date: Tuesday, December 6, 2022
Time: 3:00 PM - 5:00 PM
Location: 726 Broadway, 902, Lg Conf

Ana-Maria Raclariu
Event Type: Other
Date: Wednesday, December 7, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

James Webb Space Telescope
Heidi Hammel, AURA
Event Type: Big Apple Colloquium
Date: Thursday, December 8, 2022
Time: 4:00 PM - 5:00 PM
Location: American Museum of Natural History
Abstract: See emails for abstract and RSVP information!

Entanglement entropy in (1+1)-d with defects
Fei Yan, Rutgers
Event Type: HEP Seminar
Date: Friday, December 9, 2022
Time: 11:00 AM - 12:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: In this talk I will explore perspectives of quantum entanglement in (1+1)-d systems in presence of defects. The talk consists of two parts. In the first part, I will talk about the ground state entanglement entropy for 1d quantum spin chains with defects, using the transverse field Ising model and the three-state Potts model as examples. In the second part, I will comment on the field theoretical replica trick approach to study entanglement entropy in such systems.

Quantum-Group Group Meeting
Event Type: Other
Date: Friday, December 9, 2022
Time: 1:00 PM - 2:15 PM
Location: 726 Broadway, 902, Lg Conf

Holography from Singular Supertranslations on a Black Hole Horizon
Sangmin Choi, École Polytechnique
Event Type: Informal HEP Talk
Date: Friday, December 9, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: We investigate the standard and dual BMS supertranslation generators on the black hole horizon and draw some conclusions about black hole physics. Recently, it has been shown that in addition to the conventional BMS supertranslation symmetries, there exists another infinite set of magnetic asymptotic symmetries that are referred to as dual BMS supertranslations. We show that the Dirac bracket between these generators exhibits a central term when the parameter functions have singularities in the complex stereographical coordinates on the sphere. Such singularities are related to Dirac-string-like configurations in the bulk, and should therefore be included in the set of acceptable transformations. We then demonstrate that this anomalous central term can be removed by including an appropriate gravitational Chern-Simons theory on the horizon. This implies that consistency of the asymptotic symmetry algebra requires a new structure on the horizon.

ASTRO Journal Club
Event Type: Other
Date: Tuesday, December 13, 2022
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

To Be Determined
Blakesley Burkhart, Flatiron Institute
Event Type: Astro Seminar
Date: Tuesday, December 13, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

Tensor models, large N limit and double scaling limit
Adrian Tanasa, University of Bordeaux
Event Type: HEP Seminar
Date: Tuesday, December 13, 2022
Time: 4:00 PM - 5:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: Matrix models, seen as quantum field theoretical models, are known to represent a successful approach to 2D quantum gravity and to have many other interesting applications in Physics. Some of the main results of the study of matrix models in theoretical physics are the 't Hooft large N limit (the perturbative series can be reorganized in powers of 1/N (N being the matrix size)) and the double scaling limit mechanism (known to be related to the continuuos limit of the models). After a brief introduction dedicated to matrix models, I will focus in this talk on tensor models, which are a natural quantum field theoretical generalization of these matrix models. In particular, I will present the implementation of the large N limit (N being now the size of the tensor) and the double scaling limit mechanisms for various tensor models, such as the O(N)³-invariant tensor model, initially introduced in O dimensions by Carrozza and Tanasa, arXiv:1512.06718, and then extended to the 1-dimensional case, by Klebanov and Tarnopolsky, arXiv:1611.08915. In the last part of the talk I will present how tensor models have been related (initially by Witten and then shortly after by Klebanov and Tarnopolsky) to the Sachdev-Ye-Kitaev model, which is known to be a particularly interesting toy model for holography.

HEP Journal Club
Event Type: Other
Date: Wednesday, December 14, 2022
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

TBA
Patrick Meade, Stony Brook
Event Type: HEP Seminar
Date: Wednesday, December 14, 2022
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: TBA

Quantum-Group Group Meeting
Event Type: Other
Date: Friday, December 16, 2022
Time: 1:00 PM - 2:15 PM
Location: 726 Broadway, 902, Lg Conf

Grad Pheno Journal Club
Event Type: Grad Pheno Journal Club
Date: Monday, December 19, 2022
Time: 3:30 PM - 4:30 PM
Location: 726 Broadway, 902, Lg Conf

Grad Pheno Journal Club
Event Type: Grad Pheno Journal Club
Date: Monday, January 2, 2023
Time: 3:30 PM - 4:30 PM
Location: 726 Broadway, 902, Lg Conf

Grad Pheno Journal Club
Event Type: Grad Pheno Journal Club
Date: Monday, January 9, 2023
Time: 3:30 PM - 4:30 PM
Location: 726 Broadway, 902, Lg Conf

Grad Pheno Journal Club
Event Type: Grad Pheno Journal Club
Date: Monday, January 16, 2023
Time: 3:30 PM - 4:30 PM
Location: 726 Broadway, 902, Lg Conf

HET Discussion Session
Zare
Event Type: Other
Date: Tuesday, January 17, 2023
Time: 3:00 PM - 5:00 PM
Location: 726 Broadway, 902, Lg Conf

Grad Pheno Journal Club
Event Type: Grad Pheno Journal Club
Date: Monday, January 23, 2023
Time: 3:30 PM - 4:30 PM
Location: 726 Broadway, 902, Lg Conf

To Be Determined
Katie Breivik, Flatiron Institute
Event Type: Astro Seminar
Date: Tuesday, January 24, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

Grad Pheno Journal Club
Event Type: Grad Pheno Journal Club
Date: Monday, January 30, 2023
Time: 3:30 PM - 4:30 PM
Location: 726 Broadway, 902, Lg Conf

To Be Determined
Sasha Tchekhovskoy, Northwestern University
Event Type: Astro Seminar
Date: Tuesday, January 31, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

To Be Determined
Lam Hui, Columbia University
Event Type: Astro Seminar
Date: Tuesday, February 14, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

Stream Fanning and Bifurcations: Observing Fundamental Dynamics in Stellar Stream Morphology
Tomer Yavetz, Institute for Advanced Studies
Event Type: Astro Seminar
Date: Tuesday, February 21, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: Non-spherical gravitational potentials host a subset of resonantly-trapped orbit families surrounding special, closed orbits. The transitions between these orbit families, or separatrices, mark abrupt discontinuities in the orbital structure of the potential. I will show how the morphology of stellar streams can be used to identify and locate these separatrices, and discuss a few examples of observed streams with peculiar morphologies that may indicate the existence of a nearby dynamical resonance.

Revelations from studies of low mass galaxies: dark matter and galaxy formation on small scales
Shany Danieli, Princeton University
Event Type: Astro Seminar
Date: Tuesday, February 28, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: The number densities, structures, and internal dynamics of low-mass galaxies provide some of the most interesting clues to the nature of dark matter and the theory of galaxy formation on small scales. Up until recently, our understanding of low-mass galaxies has largely been informed by observations of dwarf galaxies that orbit our Milky Way galaxy. I will present novel observational efforts that now enable the discovery of such low surface brightness galaxies beyond our local galactic neighborhood. I will discuss some of the follow-up observations of these extragalactic low-mass galaxies, focusing on their dark matter content and intriguing globular cluster populations, revealing significant diversity and new astrophysical puzzles. I will conclude by discussing ongoing surveys that will be essential in mapping the census and properties of the general population of low-mass galaxies.

To Be Determined
Melissa Ness, Columbia University
Event Type: Astro Seminar
Date: Tuesday, March 7, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

To Be Determined
Alyson Brooks, Rutgers University
Event Type: Astro Seminar
Date: Tuesday, March 21, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

To be determined
Raffaella Margutti, UC Berkeley
Event Type: Astro Seminar
Date: Tuesday, April 4, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

To Be Determined
Maya Fishbach, University of Toronto
Event Type: Astro Seminar
Date: Tuesday, April 25, 2023
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar