EPL, vol.82, no.2, 2008 (SCI-Expanded)
The physics of randomness and regularities for languages (mother tongues) and their lifetimes and family trees and for the second languages (bilinguals) are studied in terms of two processes: random multiplicative noise and fragmentation. We start with various random initial worlds and come out with regularities which are all similar to the present empirical data for the above-mentioned terms. Copyright (c) EPLA, 2008.