Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session C18: Kadanoff Prize symposiumInvited Live Prize/Award

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Sponsoring Units: GSNP Chair: M Cristina Marchetti, University of California, Santa Barbara 
Monday, March 15, 2021 3:00PM  3:36PM Live 
C18.00001: Something from (almost) nothing: complex lessons from simplicity Invited Speaker: Nigel Goldenfeld I describe the use of minimal renormalizationgroup inspired/justified models in nonequilibrium 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 parameterfree predictions of appropriatelychosen 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. 
Monday, March 15, 2021 3:36PM  4:12PM Live 
C18.00002: Topological Phase Transitions in Population Dynamics Invited Speaker: Erwin Frey Topological phases were discovered in condensed matter physics and recently extended to classical physics such as topological mechanical metamaterials. Their study and realization in softmatter and biological systems has only started to develop. In this talk we discuss how topological phases may determine the behavior of nonlinear dynamical systems that arise, for example, in population dynamics. We have shown that topological phases can be realized with the antisymmetric LotkaVolterra equation (ALVE). The ALVE is a paradigmatic model system in population dynamics and governs, for example, the evolutionary dynamics of zerosum games, such as the rockpaperscissors game [1], but also describes the condensation of noninteracting bosons in drivendissipative setups [2]. We have shown that for the ALVE, defined on a onedimensional chain of rockpaperscissors cycles, robust polarization emerges at the chain’s edge [3]. The system undergoes a transition from left to right polarization as the control parameter passes through a critical value. At the critical point, solitary waves are observed. We found that the polarization states are topological phases and that this transition is indeed a topological phase transition. Remarkably, this phase transition falls into symmetry class D within the “tenfold way” classification scheme of gapped freefermion systems, which also applies, for example, to onedimensional topological superconductors. Beyond the observation of topological phases in the ALVE, it might be possible to generalize the approach of our work to other dynamical systems in biological physics whose attractors are nonlinear oscillators or limit cycles. 
Monday, March 15, 2021 4:12PM  4:48PM Live 
C18.00003: Leo P. Kadanoff Prize (2021): Application of FirstPassage Ideas to Diverse Phenomena Invited Speaker: Sidney Redner When does a diffusing particle first reach a specified location? The probability that such a particle first reaches a given location is known as the firstpassage probability. Firstpassage ideas underlie a wide range of phenomena, such as the triggering of integrateandfire neurons in the brain, when a fluctuating voltage level in a neuron reaches a triggering threshold, to the execution of stock options, when the price of a stock first reaches a strike price. In this talk, I discuss some basic firstpassage ideas and present a few idealized models with possible applications to mechanical systems and to finance. 
Monday, March 15, 2021 4:48PM  5:24PM Live 
C18.00004: Extreme value statistics: An overview and perspectives Invited Speaker: Satya Majumdar

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