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DTSTART:19960101T000000 END:STANDARD BEGIN:STANDARD TZNAME:GMT TZOFFSETFROM:+0100 TZOFFSETTO:+0000 DTSTART:19961027T020000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260625T033524Z DTSTART;VALUE=DATE-TIME:20110309T130000 DTEND;VALUE=DATE-TIME:20110309T140000 SUMMARY:Complexity Forum: Gunnar Pruessner (Imperial) TZID:Europe/London UID:20110309-094d43d5385c299a01386c3bd8c57219@warwick.ac.uk CREATED:20110107T151528Z DESCRIPTION:Speaker: Gunnar Pruessner (Department of Mathematics\, Imperi al College London) Title: The mean field theory of the contact process r evisited Abstract: For the last forty years\, the directed percolation u niversality class has probably played the most prominent role in far fro m equilibrium phase transitions. Phenomena belonging to this universalit y class\, such as the contact process\, are best cast into a Langevin eq uation containing a rather peculiar noise term\, whose variance is linea r in the local field\, which makes it difficult to analyse. The mean fie ld theory of the contact process normally ignores this noise term. In th is talk\, I will give an overview of ongoing work to solve exactly the L angevin equation of the random neighbour (or infinite range) contact pro cess in a finite system. The aim is to reproduce known results without r efering to the field theory and calculate universal amplitude ratios in closed form. While interesting in its own right\, the methods applied mi ght shed new light on absorbing state phase transitions in general\, suc h as the role of conditional expectation values and finite size scaling\ , and elucidate the meaning of the noise correlator and how it might be possible to tackle this type of problem from a different angle. Lunch: g roup 3 LOCATION:D1.07 CATEGORIES:MSc students,PhD Students,Seminar Room D1.07,forum LAST-MODIFIED:20120709T145409Z ORGANIZER;CN=Colm Connaughton: END:VEVENT END:VCALENDAR