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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260730T022037Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110204T170000Z
DTEND:20110204T180000Z
UID:event765@bu.edu
URL:http://physics.bu.edu/internal/events/show/765
SUMMARY:The Role of Reinforcement on Social Dynamics
DESCRIPTION:Featuring Sid Redner\, Boston University\, Physics Dept.\nHoste
	d by: Ophelia Tsui\n\nPart of the Biophysics/Condensed Matter Seminar Serie
	s.\n\nAbstract:\nIn many models of social dynamics\, some attribute is tran
	sferred by a single interaction between agents that causes an agent to chan
	ge its state.  What happens\, however\, if an agent requires multiple signa
	ls from its neighbors before changing state?  The result is quite rich.  We
	 first present a simple fad propagation model in which an agent adopts the 
	fad only after receiving K inputs to adopt from other agents.  For a popula
	tion size N\, the time until\nthe fad is adopted scales as ln N for K=1\, a
	nd N^{(K-1)/K} for K>1.  For the voter model with K inputs needed to change
	 state\, a two-time scale approach to consensus is found.  There is a manif
	old of initial conditions that leads the population to almost immediately r
	each an "apathetic" state before consensus is reached in a time that scales
	 as ln N.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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