# Seminar at SMU Delhi

September 25, 2019 (Wednesday) , 3:30 PM at Webinar
Speaker: Rahul Roy, ISI Delhi
Title: On a model of evolution of subspecies
Abstract of Talk

Ben-Ari and Schinazi (2016) introduced a stochastic model to study virus-like evolving population with high mutation rate'. This model is a birth and death model with an individual at birth being either a mutant with a random fitness parameter in $[0,1]$ or having one of the existing fitness parameters with uniform probability; whereas a death event removes the entire population of the least fit site. We change this to incorporate the notion of survival of the fittest', by requiring  that a non-mutant individual, at birth, has a fitness according to a preferential attachment mechanism, i.e., it has a fitness $f$ with a probability proportional to the size of the population of fitness $f$. Also death just removes one individual at the least fit site. This preferential attachment rule leads to a power law behavior in the asymptotics, unlike the exponential behaviour obtained by Ben-Ari and Schinazi (2016).

This is joint work with Hideki Tanemura.