Long-lived localized field configurations in small lattices: Application to oscillons

Long-lived localized field configurations such as breathers, oscillons, or more complex objects naturally arise in the context of a wide range of nonl inear models in different numbers of spatial dimensions. We present a numer ical method, which we call the adiabatic damping method, designed to study such configurations in small lattices. Using three-dimensional oscillons in phi(4) models as an example, we show that the method accurately (to one pa rt in 10(5) or better) reproduces results obtained with static or dynamical ly expanding lattices, dramatically cutting down in integration time. We fu rther present results for two-dimensional oscillons, whose lifetimes would be prohibitively long to study with conventional methods.