title: Model of biological evolution with threshold dynamics and infinitely many absorbing states.
abstract: We study a model of biological evolution where the survival of a given species depends on its interactions with neighboring species. In the steady state the model has an active phase and an absorbing phase, which are separated by the critical point of the directed percolation universality class. The absorbing phase is infinitely degenerate and the dynamical behavior of our model is found to be nonuniversal.
authors.affiliation: Department of Mathematics, Heriot-Watt University, EH14 4AS Edinburgh, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Lipowski
authors.forename: M
authors.initials: M
authors.lastname: Łopata