Società Italiana di Fisica, Nuovo Cimento B, 709(119), p. 661-683, 2005
DOI: 10.1393/ncb/i2004-10176-8
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We study the semilinear wave equation in Schwarzschild metric ((3 + 1)-dimensional space-time). First, we establish that the problem is locally well posed in Hsigma for any sigma => 1; then we prove the blow up of the solution for every p ∈ ]2, 1 + [ and non-negative non-trivial initial data.