Two-scalar model for a small but nonzero cosmological constant

We reexamine a model of the two-scalar system proposed previously for understanding a small but nonzero cosmological constant. The model provides solutions of the scalar-field energy rho(s) which behaves as a true constant for a limited time interval rather than in the way of tracker- or scaling-type variations. This causes mini-inflation, as indicated by recent observations. As another novel feature, rho(s) and the ordinary matter density rho(m) always fall off side by side, but interlacing, also as (time)(-2) as an overall behavior in conformity with the scenario of a decaying cosmological constant. Mini-inflation occurs whenever rho(s) overtakes rho(m), which may happen more than once, shedding new light on the coincidence problem. We present a new example of the solution, and offer an intuitive interpretation of the mechanism of the nonlinear dynamics. We also discuss the chaoslike nature of the solution.