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SUMMARY:Fluctuating interfaces and paths in disordered and non-equilibrium
  systems
DTSTART:20190218T140000
DTEND:20190218T153000
DTSTAMP:20260407T051101Z
UID:10c37a57a0c8f8e4330096dca536c795273af0df9deb9d649444b279
CATEGORIES:Conferences - Seminars
DESCRIPTION:Yun Chu\nDirected polymers in random media (DPRM) is a simple 
 lattice model in the Kardar-Parisi-Zhang (KPZ) universality class for stoc
 hastic surface growth. The model considers configurations of a directed pa
 th traversing a random energy landscape\, and can be simulated in polynomi
 al time through a transfer matrix formulation. As a possible application\,
  we examine the expansion of biological populations into new territory usi
 ng methods from DPRM\, and model the stochastic spatial wandering of both 
 genetic lineages and the boundaries between genetically segregated sectors
 . Laboratory experiments on microbial range expansions have shown that thi
 s stochastic wandering\, transverse to the front\, is superdiffusive due t
 o the front's growing roughness\, implying much faster loss of genetic div
 ersity than predicted by simple flat front diffusive models. We study the 
 evolutionary consequences of this superdiffusive wandering by computing co
 alescence statistics for pairs of individuals separated at the front\, and
  exploring how environmental heterogeneities can locally suppress fluctuat
 ions.
LOCATION:BSP 407 https://plan.epfl.ch/?room==BSP%20407
STATUS:CONFIRMED
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