Vol. 10, No. 2, 2017

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Time-weighted estimates in Lorentz spaces and self-similarity for wave equations with singular potentials

Marcelo F. de Almeida and Lucas C. F. Ferreira

Vol. 10 (2017), No. 2, 423–438

We show time-weighted estimates in Lorentz spaces for the linear wave equation with singular potential. As a consequence, assuming radial symmetry on initial data and potentials, we obtain well-posedness of global solutions in critical weak-Lp spaces for semilinear wave equations. In particular, we can consider the Hardy potential V (x) = c|x|2 for small |c|. Self-similar solutions are obtained for potentials and initial data with the right homogeneity. Our approach relies on performing estimates in the predual of weak-Lp, i.e., the Lorentz space L(p,1) .

wave equations, singular potentials, self-similarity, radial symmetry, Lorentz spaces
Mathematical Subject Classification 2010
Primary: 35L05, 35L71, 35L15, 35A01, 35B06
Secondary: 35C06, 42B35
Received: 2 July 2016
Accepted: 12 November 2016
Published: 23 February 2017
Marcelo F. de Almeida
Departamento de Matemática
Universidade Federal de Sergipe, CCET
Av. Marechal Rondon, s/n
49100-000 Aracaju-SE
Lucas C. F. Ferreira
Departamento de Matemática
Universidade Estadual de Campinas, IMECC
Rua Sérgio Buarque de Holanda, 651
13083-859 Campinas-SP