H. Lindblad et Cd. Sogge, ON EXISTENCE AND SCATTERING WITH MINIMAL REGULARITY FOR SEMILINEAR WAVE-EQUATIONS, Journal of functional analysis, 130(2), 1995, pp. 357-426
We prove existence and scattering results for semilinear wave equation
s with low regularity data. We also determine the minimal regularity t
hat is needed to ensure local existence and well-posedness, and we giv
e counterexamples to well-posedness. More specifically, we show that e
quations of the type square u=\ u \(p), with initial data (u, u(t)) in
H-7(R(n))x H-y-1(R(n)), have a local solution if y greater than or eq
ual to y(p, n), and we construct counterexamples if y < y(p, n). The e
xistence results rely on mixed-norm space-time estimates of Strichartz
-type. (C) 1995 Academic Press, Inc.