Theoretical Statistics and Mathematics Unit, ISI 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.