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TZID:Europe/Paris
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BEGIN:VEVENT
UID:0-718@lptms.universite-paris-saclay.fr
DTSTART:20200128T110000Z
DTEND:20200128T120000Z
DTSTAMP:20200111T144612Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-giulio-biroli-lpens/
SUMMARY:Séminaire du LPTMS: Giulio Biroli (LPENS) - Salle des séminaires 
 du FAST et du LPTMS\, bâtiment Pascal n°530 - 28 Jan 20 11:00
DESCRIPTION:Multiple Equilibria\, Aging Dynamics and Chaos in Large Interac
 ting Ecosystems\nGiulio Biroli (LPENS)\n\nI will focus on Lotka-Volterra e
 quations\, which provide a general model to study large assemblies of stro
 ngly interacting degrees of freedom in many different fields: biology\, ec
 onomy and in particular ecology. I will present our analysis of the genera
 lised Lotka-Volterra model of an ecological community formed by a large nu
 mber of species and focus in particular on two different phases that emerg
 e: when interactions are symmetric we find a regime\, akin to the spin-gla
 ss phase of random magnets\, characterized by an exponential number of mul
 tiple equilibria\, all poised at the edge of stability. For non-symmetric 
 interactions\, this phase is replaced by a chaotic one or a dynamical agin
 g regime depending on the presence of immigration from the mainland. Final
 ly\, I will consider spatially coupled communities and show that migration
  between them plays a key role in enhancing chaos and diversity of the eco
 system.
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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