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- W2265316376 abstract "The Calder'on-Zygmund estimates for parabolic equations are revisited under the light of the language of semigroups. One of the main features of this novel point of view is that it does not rely on the heavy use of the symmetries of the Fourier transform. Instead, our method uses semigroup kernel estimates. Although parabolic differential operators are not positive, we manage to overcome the difficulty and define their negative powers by using complex variable. Then the derivatives of solutions $partial_tu$ and $D^2u$ are obtained by taking derivatives of the negative powers of the parabolic operator. By using this idea, new global a priori Sobolev estimates in space and time for the harmonic oscillator evolution equation $$partial_tu=Delta u-|x|^2u+f,quad tinmathbb{R},~xinmathbb{R}^n,$$ as well as for the corresponding Cauchy problem $$begin{cases} partial_tu=Delta u-|x|^2u+f,&t>0,~xinmathbb{R}^n, u(0,x)=g(x),&xinmathbb{R}^n, end{cases}$$ are obtained. Convergence results to initial data and mixed norm Sobolev estimates are also deduced. As a test of our method, we recover the classical parabolic Sobolev estimates, though some new results for the heat equation are also proved." @default.
- W2265316376 created "2016-06-24" @default.
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- W2265316376 date "2016-02-02" @default.
- W2265316376 modified "2023-09-27" @default.
- W2265316376 title "The Calder'on-Zygmund estimates for parabolic equations revisited and novel applications" @default.
- W2265316376 hasPublicationYear "2016" @default.
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