报告题目：Pattern Formation: From Nature to Physics and back
报告摘要：Pattern are universally present in Nature. They are spatially varying state (+temporally) in systems far from equilibrium. They are usually result of a transition from a spatially uniform state to a state with spatial variation. Unveiling and characterizing this disordered states is challenging. Model equation are useful playground to develop new ways to characterizing those disordered states. Two main application will be presented in this talk one on a model equation (the Complex Ginzburg Landau Equation (CGLE)) and other in Active Matter. Also it will be presented how the techniques develop to study this problem can be applied to other areas (oceanography, oil company prospecting). CGLE has a rich phase diagram, with well-defined transitions from order to disordered states (patterns). It will be presented how to characterize, control and synchronize those states (PRL, 77:267,1996; PRL, 78:4379 ,1997; PRE, 56 (1), 151,1997).
Active Matter is a new, wide and fast growing area. In present March APS Meeting there will be 20 sections dedicated to this area and PRL has now section for communication on this area. Here I mainly show some results in collective motion in Vicsek-style model based which present Kosterlitz-Thouless transition to Quasi Long Range Order (QLRO) and giant fluctuation in a apolar Vicsek model like particle movement. Also, some results in collective motion of self-propelled particles with memory (PRL, 96, 180602, 2006; PRL 114 (16), 168001, 2015).
报告人简介：Ral Montagne graduate from UDELAR in Uruguay(Universidad de la Republica del Uruguay). In 1996 he obtained his PhD. in Physics at Universitat de les Illes Balears (Spain) and work as visiting researcher with Maxi San Miguel's group in the same university. After a short post-doc position at Super Computer Research Institute (SCRI) in FSU, Tallahassee, Florida, USA. He joint the Physics Instititute at UDELAR in Uruguay. He develop software for filtering signals for the brazilian oil company PETROBRAS. He is now full professor at the Physics Department at the UFRPE university (Universidade Federal Rural de Pernambuco) in Brazil. He worked in chaos, spatio-temporal chaotic system, statiscal physics, active matter and physical applications in petroleum, oceanography been published (mostly) in PRE, Physics of Fluid, and PRL (5).