Well-posedness of the Cauchy problem for the fractional power dissipative equations

Abstract

This paper studies the Cauchy problem for the nonlinear fractional power dissipative equation $u_t+(-△{)}^{\alpha }u=F(u)$ for initial data in the Lebesgue space $L^r(\mr^n)$ with $\ds r\ge r_d\triangleq{nb}/({2α-d})$ or the homogeneous Besov space $\ds\dot{B}^{-σ}_{p,\infty}(\mr^n)$ with $\dsσ=(2α-d)/b-n/p$ and $1\le p\le \infty$, where $\alpha >0$, $F(u)=f(u)$ or $Q(D)f(u)$ with $Q(D)$ being a homogeneous pseudo-differential operator of order $d\in [0,2\alpha )$ and $f(u)$ is a function of $u$ which behaves like $|u{|}^{b}u$ with $b>0$.

30pages

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