Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session F37: Onsager/Apker/Oppenheim/Kadanoff Prize SessionInvited Prize/Award Undergrad Friendly
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Sponsoring Units: GSNP Chair: Greg Huber, Chan Zuckerberg Biohub Room: 605 |
Tuesday, March 3, 2020 8:00AM - 8:36AM |
F37.00001: The flocking theory: The early developments and a new perspective Invited Speaker: Yuhai Tu In this talk, I will first describe some of the "accidental" events over 25 years ago that led to the early developments of the flocking theory. I will then discuss a possible new perspective on the flocking theory by looking at the non-equilibrium thermodynamics of collective motion in active matter. |
Tuesday, March 3, 2020 8:36AM - 9:12AM |
F37.00002: Title: Birth, Death, and Flight: the hydrodynamics of Malthusian flocks Invited Speaker: John Toner Abstract: |
Tuesday, March 3, 2020 9:12AM - 9:48AM |
F37.00003: Dynamics of the Outer Solar System: from Neptune to Planet Nine Invited Speaker: Tali Khain The Kuiper belt, found beyond the orbit of Neptune, consists of a population of small, icy bodies that orbit the Sun. Due to perturbations from the giant planets (Jupiter, Saturn, Uranus, Neptune), the orbits of these objects slowly evolve with time. In this talk, we will analyze the orbital dynamics of the Kuiper belt objects (KBOs) both with numerical simulations and with a theoretical Hamiltonian approach. We will discuss the structure of the outer Solar System and focus on the most extreme sub-population of objects: the long-period high eccentricity class. The orbits of these extreme KBOs all appear to point in the same direction in physical space; this anomalous signal cannot be explained by the currently known eight-planet Solar System. In order to understand their origin and dynamics, we introduce the hypothesized Planet Nine to the distant Kuiper belt. We find that the presence of Planet Nine allows for two stable populations of objects - the aligned and anti-aligned KBOs - in agreement with observations. We will discuss the mechanisms that lead to this stability, and focus on a fascinating process called resonance hopping, in which a KBO rapidly transitions from one resonance to another with Planet Nine. By tying together studies of observed KBOs with more general analyses of the evolution of synthetic test particles, we elucidate the dynamics of the outer Solar System in and out of the Planet Nine context. |
Tuesday, March 3, 2020 9:48AM - 10:24AM |
F37.00004: Irwin Oppenheim Award talk: What is the simplest model of an amorphous solid? Invited Speaker: Eric DeGiuli From glasses and emulsions to colloids and granular matter, amorphous solids show surprising universality in correlations, vibrational properties, and rheology. It has become increasingly clear that constraints of mechanical equilibrium control these universal features. Is there a simple model, analogous to the Debye model for crystals, able to explain this? I will review attempts to answer this question from jamming, large-dimension, and field-theoretic approaches, and argue that the latter is useful and parsimonious. Future challenges and gaps in understanding will be outlined. |
Tuesday, March 3, 2020 10:24AM - 11:00AM |
F37.00005: Something from (almost) nothing: complex lessons from simplicity Invited Speaker: Nigel Goldenfeld I describe the use of minimal renormalization-group inspired/justified models in non-equilibrium statistical physics and biology. Using examples chosen from my own work in pattern formation, turbulence and biology, I point out that minimal models are able to make specific parameter-free predictions of appropriately-chosen experimental quantities, an outcome of universality in somewhat surprising settings. I argue that these considerations account for the unreasonable effectiveness of theoretical physics in describing seemingly complex phenomena. |
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