April 3, 2023 Monday 9:30 AM
+
Hybrid: 726
Broadway, 871 and Zoom
Soft Condensed Matter Seminars
(
csmr)
CSMR Monday Morning Seminar
Paul McNulty and Buming Guo Presenting
https://nyu.zoom.us/j/92611015549
April 3, 2023 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Calvin Chen
New York University
Gaia astrometry and dark objects in the Milky Way halo
April 3, 2023 Monday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Informal Astro Talk
Amara McCune
UC Santa Barbara/Lawrence Berkeley National Lab
TBA
TBA
April 4, 2023 Tuesday 2:00 PM
+
726
Broadway, Room 1067, CQP Seminar
Center for Quantum Phenomena Seminars
(
cqp)
Davi Geiger
Courant, NYU
Quantum Entropy Role
Quantum physics, despite its intrinsically probabilistic nature, lacks a definition of entropy fully accounting for the randomness of a quantum state. For example, von Neumann entropy quantifies only the incomplete specification of a quantum state and does not quantify the probabilistic distribution of its observables; it trivially vanishes for pure quantum states. We propose a quantum entropy that quantifies the randomness of a pure quantum state via a conjugate pair of observables/operators forming the quantum phase space. The entropy is dimensionless, it is a relativistic scalar, it is invariant under canonical transformations and under CPT transformations, and its minimum has been established by the entropic uncertainty principle.
We show that the entropy is monotonically increasing during a time evolution of coherent states under a Dirac Hamiltonian. We hypothesize an entropy law governing physical systems whereby the entropy of a closed system never decreases, implying a time arrow for particle physics.
We then explore the possibility that as the oscillations of the entropy must by the law be barred in quantum physics, potential entropy oscillations trigger annihilation and creation of particles.
If time permits, we also present the entropy for the spin degree of freedom in the spin phase space.
April 5, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
High Energy Physics Seminars
(
hep)
Daniel Kapec
Harvard
April 6, 2023 Thursday 12:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Equity & Inclusion Committee
April 6, 2023 Thursday 4:00 PM
+
Hybrid: 726
Broadway, 940 and Zoom
Center for Quantum Information Physics Seminars
(
cqip)
Physics Colloquia
(
colloquia)
Mark Eriksson
University of Wisconsin-Madison
Quantum Computing Using Electron Spins in Silicon
Quantum computing is based on the manipulation of quantum bits – qubits – that are two-level systems meeting a set of stringent requirements known as the DiVincenzo criteria. As much as possible, qubits must be isolated from their environment in order to preserve quantum coherence. Remarkably, the techniques used to make classical silicon CMOS devices can be used to make qubits with excellent performance. The operation of these devices, on the other hand – from the required temperatures to the number of electrons comprising a typical qubit – is very different from what is found in even the most advanced classical integrated circuits. In this talk I will present both a short historical overview of how quantum computing in silicon has developed, as well as the latest results from both our group at Wisconsin and from around the world. I will emphasize the role of integration, including 3D integration, which enables readout of qubits formed in Si/SiGe heterostructures by measuring the microwave transmission of a superconducting resonator that is hosted on a separate substrate. That resonator chip is flip-chip bonded to the qubit chip, creating a stacked set of integrated semiconductor and superconductor circuits. I will close this talk by discussing very recent results demonstrating the remarkable properties of silicon quantum wells containing short wavelength oscillations in the concentration of added germanium atoms. Advances like these have, in just the last few years, demonstrated that a future quantum computing technology in silicon will likely integrate sophisticated techniques and knowledge cutting across many disciplines, not only from physics and computer science, but also from electrical engineering and materials science – a feature that makes it an incredibly dynamic (and fun!) field of science and technology.
April 7, 2023 Friday 3:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
HEP Discussion Sessions
Zare Zare
April 10, 2023 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Conghuan Luo
New York University
To Be Determined
April 11, 2023 Tuesday 2:00 PM
+
726
Broadway, 1067
Center for Quantum Phenomena Seminars
(
cqp)
Norah M. Hoffmann
Columbia University
TBA
April 12, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
High Energy Physics Seminars
(
hep)
Matt Reece
Harvard
TBA
TBA
April 13, 2023 Thursday 11:00 AM
+
726
Broadway, Room 1067
Center for Quantum Information Physics Seminars
(
cqip)
Alireza Seif
IBM
TBA
April 13, 2023 Thursday 12:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Equity & Inclusion Committee
April 13, 2023 Thursday 4:00 PM
+
Hybrid: 726
Broadway, 940 and Zoom
Physics Colloquia
(
colloquia)
Ned Wingreen
Princeton University
Capillary Attraction Underlies Bacterial Collective Dynamics
“Water is the driving force of all nature.” — Leonardo da Vinci
Collective motion of active matter occurs in many living systems, such as bacterial communities, epithelial cell populations, bird flocks, and fish schools. A remarkable example can be found in the soil-dwelling bacterium Myxococcus xanthus. Key to the life cycle of M. xanthus cells is the formation of collective groups: they feed on prey in swarms and aggregate upon starvation. However, the physical mechanisms that keep M. xanthus cells together remains unclear. I’ll present a computational model to explore the role that capillary forces play in bacterial collective dynamics. The modeling results, combined with experiments, show that water menisci forming around bacteria mediate strong capillary attraction between cells. The model accounts for a variety of previously observed phases of collective dynamics as the result of a competition between cell-cell capillary attraction and cell motility. Finally, I’ll discuss the large-scale self-organization of bacterial populations and highlight the importance of capillary force in this process. Together, these results suggest that cell-cell capillary attraction provides a generic mechanism underpinning bacterial collective dynamics.
April 14, 2023 Friday 3:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
HEP Discussion Sessions
Zare Zare
April 17, 2023 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Sarah Pearson
New York University
To Be Determined
April 18, 2023 Tuesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Magdalena Siwek
Harvard University
To be determined
To be determined
April 18, 2023 Tuesday 2:00 PM
+
726
Broadway, 1067, CQP Seminar
Center for Quantum Phenomena Seminars
(
cqp)
Sriram Ganeshan
CCNY
TBA
April 19, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
High Energy Physics Seminars
(
hep)
David B Kaplan
U of Washington
TBA
TBA
April 20, 2023 Thursday 11:00 AM
+
726
Broadway, Room 1067
Center for Quantum Information Physics Seminars
(
cqip)
Derek Wang
IBM
TBA
April 20, 2023 Thursday 12:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Equity & Inclusion Committee
April 21, 2023 Friday 3:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
HEP Discussion Sessions
Zare Zare
April 24, 2023 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Kate Storey-Fisher
New York University
To Be Determined
April 25, 2023 Tuesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Maya Fishbach
University of Toronto
To Be Determined
April 26, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
High Energy Physics Seminars
(
hep)
Soubhik Koumar
UC Berkeley + LBL
TBA
TBA
April 27, 2023 Thursday 11:00 AM
+
726
Broadway, Room 1067
Center for Quantum Information Physics Seminars
(
cqip)
John Davis
University of Alberta
Observations spanning multiple astronomical scales point
Observations spanning multiple astronomical scales point to the existence of an unknown form of matter, dubbed “dark matter”, that constitutes over 85% of the mass of most galaxies. Recent theoretical insights into the possible nature of dark matter and how it interacts with normal matter have inspired a wide range of experimental efforts aimed at directly detecting dark matter. As part of this effort, we are developing small-scale experiments to search for multiple well-motivated “ultralight” dark matter candidates, placing much stronger bounds than are currently possible with high-cost and/or large-scale efforts. The core enabling technology relies on quantum-limited microwave cavity readout of mechanical motion in superfluid helium. I will tell you about the experiments that have led up to where we are now, and our current efforts with regards to this table-top dark matter search.
April 27, 2023 Thursday 12:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Equity & Inclusion Committee
April 28, 2023 Friday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Informal HEP Talk
Babis Anastasiou
ETH Zurich
TBA
April 28, 2023 Friday 3:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
HEP Discussion Sessions
Zare Zare
May 1, 2023 Monday 12:30 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
CCPP Brown Bag
Xuyao Hu
New York University
To Be Determined
May 1, 2023 Monday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Shany Danieli
Princeton University
Revelations from studies of low mass galaxies: dark matter and galaxy formation on small scales
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.
May 3, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
High Energy Physics Seminars
(
hep)
Linda Xu
UC Berkeley + LBL
TBA
TBA
May 4, 2023 Thursday 12:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Equity & Inclusion Committee
May 5, 2023 Friday 3:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
HEP Discussion Sessions
Zare Zare
May 10, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
High Energy Physics Seminars
(
hep)
Dam Thanh Son
U Chicago
TBA
TBA
May 11, 2023 Thursday 12:30 PM
+
726
Broadway, 901, Sm Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Other
Equity & Inclusion Committee
June 9, 2023 Friday 11:00 AM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Informal Astro Talk
Chris Nagele
Haverford
Supermassive black holes: where do they come from and how do they grow?
Supermassive black holes are thought to be one of the fundamental ingredients in galaxy evolution, yet due to the difficulty of direct observation, basic questions such as the origin and growth of these black holes remain unanswered. A promising explanation for the origin of supermassive black holes is the direct collapse hypothesis, where massive gas clouds in the early universe contract to form supermassive stars which then collapse to black holes and become the seeds for observed supermassive black holes. This scenario is difficult to probe observationally because of the extreme distances involved, but one possibility is the general relativistic supernova of a supermassive star, an event which is luminous enough to be observed at high redshift. I will present numerical models of the evolution, instability and explosion of supermassive stars and discuss prospects for direct and indirect observation with current and future telescopes. I will then describe another recent paper where we attempt to elucidate correlations between active galactic nuclei and the morphology of the host galaxy using a variational autoencoder, a technique from generative modeling. We identify a correlation between host galaxy morphology and AGN activity and thus demonstrate the potential for similar techniques to be applied to larger datasets from future telescopes.
June 14, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Special Seminar
Or Graur
University of Portsmouth
Tidal disruption event light echoes in SDSS and DESI spectra
September 1, 2023 Friday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Raffaella Margutti
UC Berkeley
To be determined
Fall date to be determined
