All Scheduled Events, Physics | AS

September 21, 2020 Monday 12:30 PM +
Züm
Other Center for Cosmology and Particle Physics Events (ccpp)

CCPP Brown Bag
CCPP and EPP Faculty
New York University

Cosmology and Particle Physics Minisymposium

The faculty of the CCPP will give brief introductions to their research and describe the opportunities available in their groups. Short talks, each about 5 minutes, will be given as follows. Michael Blanton will give a brief introduction and describe research on nearby galaxies. Glennys Farrar will discuss astroparticle physics. Maryam Modjaz will discuss observations of exploding stars. Allen Mincer will discuss experimental particle physics. Anthony Pullen will discuss cosmology and intensity mapping. Jeremy Tinker will discuss cosmology and large scale structure. Finally, Ken Van Tilburg will discuss theoretical particle physics.

September 22, 2020 Tuesday 2:00 PM +
zum
Astrophysics and Relativity Seminars (astro)

Rachel Beaton
Princeton

TBA

September 23, 2020 Wednesday 10:00 AM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Eric Clement
PMMH-ESPCI and Sorbonne University, Paris.

Spontaneous and driven active matter flows

Understanding individual and macroscopic transport properties of motile micro-organisms in complex environments is a timely question, relevant to many ecological, medical and technological situations. At the fundamental level, this question is also receiving a lot of attention as fluids loaded with swimming micro-organisms has become a rich domain of applications and a conceptual playground for the statistical physics of “active matter”. The existence of microscopic sources of energy borne by the motile character of these micro-swimmers is driving self-organization processes at the origin of original emergent phases and unconventional macroscopic properties leading to revisit many standard concepts in the physics of suspensions. In this presentation, I will report on a recent exploration on the question of spontaneous formation of large scale collective motion in relation with the rheological response of active suspensions. I will also present new experiments showing how the motility of bacteria can be controlled such as to extract work macroscopically.

September 23, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

September 28, 2020 Monday 12:30 PM +
Zoom
Other Center for Cosmology and Particle Physics Events (ccpp)

CCPP Brown Bag
Sergei Dubovsky
New York University

September 30, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

September 30, 2020 Wednesday 2:00 PM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Anthony Dinsmore
University of Massachusettes Amherst

Adhering, wrapping, and bursting of lipid bilayer membranes: understanding effects of membrane-binding particles and polymers

Proteins and membranes form remarkably complex structures that are key to intracellular compartmentalization, cargo transport, and cell morphology. Despite this wealth of examples in living systems, we still lack design principles for controlling membrane morphology in synthetic systems. With experiments and simulations, we show that even the simple case of spherical or rod-shaped nanoparticles binding to lipid-bilayer membrane vesicles results in a remarkably rich set of morphologies that can be reliably controlled via the particle binding energy. When the binding energy is weak relative to a characteristic membrane-bending energy, vesicles adhere to one another and form a soft solid gel, which is a useful platform for controlled release. With larger binding energy, a transition from partial to complete wrapping of the nanoparticles causes a remarkable vesicle destruction process culminating in rupture, nanoparticle-membrane tubules, and vesicle inversion. We have explored the behavior across a wide range of parameter space. These findings help unify the wide range of effects observed when vesicles or cells are exposed to nanoparticles. They also show how they open the door to a new class of vesicle-based, closed-cell gels that are more than 99% water and can encapsulate and release on demand. I will discuss how triggering membrane remodeling could lead to shape-responsive systems in the future.

October 5, 2020 Monday 12:30 PM +
Zoom!
Other Center for Cosmology and Particle Physics Events (ccpp)

CCPP Brown Bag
Patrick Breysse
New York University

Intensity Mapping

October 6, 2020 Tuesday 2:00 PM +
zum
Astrophysics and Relativity Seminars (astro)

Nimisha Kumari
STScI

TBA

October 7, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

October 7, 2020 Wednesday 2:00 PM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Sharon Glotzer
Univerity of Michigan

TBA

October 14, 2020 Wednesday 10:00 AM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Roel Dullens
University of Oxford

Shaping colloidal bananas to reveal biaxial, splay-bend nematic, and smectic phases

Colloidal dispersions of rod-like particles are widely accepted as convenient model systems to study the phase behavior of liquid-crystal forming systems, commonly found in LCDs. This is due to the fact that colloidal rods exhibit analogous phase behavior to that of elongated molecules, while they can be directly observed by optical microscopy. Recently, there has been a surge of interest in the liquid crystalline behaviour of so-called bent-core, or banana-shaped, molecules. This is due to their ability to form exotic biaxial nematic phases such as the twist-bend and splay-bend nematic phase, which may be of particular interest inherent to their fast switching response in LCDs. Here, we develop model “banana-shaped” colloidal particles with tunable dimensions and curvature, whose structure and dynamics are accessible at the particle level.  By heating initially straight rods made of SU-8 photoresist, we induce a controllable shape deformation that causes the rods to buckle into banana-shaped particles. We elucidate the phase behavior of differently curved colloidal bananas using confocal microscopy. Although highly curved bananas only form isotropic phases, less curved bananas exhibit very rich phase behavior, including biaxial nematic phases, polar and antipolar smectic-like phases, and even the long-predicted, elusive splay-bend nematic phase

October 14, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

October 20, 2020 Tuesday 2:00 PM +
zum
Astrophysics and Relativity Seminars (astro)

Laura Keating
Kavli Institute Cambridge

TBA

October 21, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

October 21, 2020 Wednesday 2:00 PM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Bulbul Chakraborty
Brandeis University

Soft Capricious Matter: The collective behavior of particles with “noisy” interactions

Diversity in the natural world emerges from the collective behavior of large numbers of interacting objects. Statistical physics provides the framework relating microscopic to macroscopic properties. A fundamental assumption underlying this approach is that we have complete knowledge of the interactions between the microscopic entities. But what if that, even though possible in principle becomes impossible in practice ? Can we still construct a framework for describing their collective behavior ? Dense suspensions and granular materials are two often quoted examples where we face this challenge. These are systems where because of the complicated surface properties of particles there is extreme sensitivity of the interactions to particle positions. In this talk, I will present a perspective based on notions of constraint satisfaction that provides a way forward. I will focus on our recent work on the emergence of elasticity in the absence of any broken symmetry, and sketch out other problems that can be addressed using this perspective.

October 28, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

October 28, 2020 Wednesday 3:00 PM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Connie B. Chang
Montana State University

TBA

November 4, 2020 Wednesday 10:00 AM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Valentina Emiliani
Vision Institut, France

TBA

November 4, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

November 11, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

November 11, 2020 Wednesday 2:00 PM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Christian Santangelo
Syracuse University

TBA

November 17, 2020 Tuesday 2:00 PM +
zum
Astrophysics and Relativity Seminars (astro)

Andres Plazas Malagon
Princeton

TBA

November 18, 2020 Wednesday 2:00 AM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Daniel I. Goldman
Georgia Institute of Technology

TBA

November 18, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

November 25, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

December 1, 2020 Tuesday 2:00 PM +
zum
Astrophysics and Relativity Seminars (astro)

Melodie Kao
Arizona State University

TBA

December 2, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

December 2, 2020 Wednesday 2:00 PM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Katia Bertoldi
Harvard University

TBA

December 7, 2020 Monday 12:30 PM +
zoom
Other Center for Cosmology and Particle Physics Events (ccpp)

CCPP Brown Bag
Tea Temim
Space Telescope Science Institute long-term visitor

December 9, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

December 16, 2020 Wednesday 12:30 PM +
zum
Other Center for Cosmology and Particle Physics Events (ccpp)

Astro Ph
Astro Ph

Astro Ph

January 27, 2021 Wednesday 2:00 PM +
https://nyu.zoom.us/s/91857577418
Soft Condensed Matter Seminars (csmr)

Emanuela Del Gado
Georgetown University

TBA

TBA