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A blow-up result for the semilinear Euler-Poisson-Darboux-Tricomi equation with critical power nonlinearity
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In this paper, we prove a blow-up result for a generalized semilinear Euler-Poisson-Darboux equation with polynomially growing speed of propagation, when the power of the semilinear term is a shift of the Strauss' exponent for the classical semilinear wave equation. Our proof is based on a comparison argument of Kato-type for a second-order ODE with time-dependent coefficients, an integral representation formula by Yagdjian and the Radon transform. As byproduct of our method, we derive upper bound estimates for the lifespan which coincide with the sharp one for the classical semilinear wave equation in the critical case.
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Appearance of Strauss-type exponent in semilinear wave equations with time-dependent speed of propagation
Small data blow up before time C epsilon^{-2p(p-1)/((1+alpha)gamma)} for u_tt - a(t)^2 Delta u + b(t) u_t = |u|^p whenever p is below the generalized Strauss exponent.
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