2 seminars next week

[CM ICTP - Trieste]

CONDENSED MATTER AND STATISTICAL PHYSICS SECTION

	
INFORMAL SEMINAR  on  Statistical Physics






Wednesday, 18 October    -    11:00 a.m.




Lecture Room 'C'- Main Building    (terrace level)

		


V. SONI   ( National Physical Laboratory, New Delhi )




" Diversity begets stability in an evolutionary model "


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CONDENSED MATTER AND STATISTICAL PHYSICS SECTION

	
INFORMAL SEMINAR  on  Statistical Physics





Thursday, 19 October    -    11:00 a.m.



Lecture Room 'C'- Main Building  (terrace level)

		


A. SANCHEZ  ( Universidad Carlos III de Madrid )



" Time scales in evolutionary dynamics "

A fundamental, profound and broad-ranging unsolved question is how 
cooperation among animals and humans has evolved.  Evolutionary game 
theory is the mathematical framework that has provided the deepest 
insights into this issue.  Simple games such as the Prisoners' Dilemma, 
the snowdrift game or the stag-hunt game have been the subject of 
intense experimental and theoretical work along this line, but no 
previous approach has considered the influence of different evolution 
rates.
Here we show that the pace at which selection acts on the population is 
crucial for the appearance and stability of cooperation. Even in 
non-dilemma games such as Harmony, where cooperation is the only 
possible rational outcome, defectors may be selected for if population 
renewal is very rapid. We carry out a thorough study of the different 
types of 2x2 symmetrical games and find that unexpected results arise 
in all three cases. We discuss the nature of the changes induced by the 
time scale competition and point out the necessity to include a 
discussion of the time scale of evolution in any study about 
cooperation.