Startseite Mathematik Lipschitz stability estimates in inverse source problems for a fractional diffusion equation of half order in time by Carleman estimates
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Lipschitz stability estimates in inverse source problems for a fractional diffusion equation of half order in time by Carleman estimates

  • Atsushi Kawamoto EMAIL logo
Veröffentlicht/Copyright: 11. April 2018

Abstract

In this article, we consider a fractional diffusion equation of half order in time. We study inverse problems of determining the space-dependent factor in the source term from additional data at a fixed time and interior or boundary data over an appropriate time interval. We establish the global Lipschitz stability estimates in the inverse source problems. Our methods are based on Carleman estimates. Here we prove and use the Carleman estimates for a fractional diffusion equation of half order in time.

MSC 2010: 35R30; 35R11

A Appendix

In this appendix, we state the Carleman estimate for second-order elliptic equations. We used this estimate in the proof of the Lipschitz stability estimate in inverse source problems.

We consider the following elliptic operator:

A~v(x)=x(a~(x)xv(x))+b~(x)xv(x)+c~(x)v(x),xΩ.

We assume that a~C1(Ω¯), b~,c~L(Ω) and the existence of a constant μ~>0 such that

1μ~<a~(x)<μ~,xΩ.

Let θ0>0. We define the following weight functions:

φ~i(x)=θ0eλdi(x),α~i(x)=θ0(eλdi(x)-e2λdiC(Ω¯))

for i=0,1. Here d0,d1 are the functions defined in Section 2.

Lemma A.1 (Carleman estimate with weight φ~0, α~0 for the elliptic equations).

There exists λ0>0 such that for any λλ0, we can choose s0(λ)>0 satisfying the following: there exists a constant C=C(s0,λ0)>0 such that

Ω(1sφ~0|x2v|2+sλ2φ~0|xv|2+s3λ4φ~03|v|2)e2sα~0𝑑xCΩ|A~v|2e2sα~0𝑑x+ωs3λ4φ~03|v|2e2sα~0𝑑x

for all s>s0 and all vH2(Ω) satisfying v(0)=xv(0)=0.

Lemma A.2 (Carleman estimate with weight φ~1, α~1 for the elliptic equations).

There exists λ0>0 such that for any λλ0, we can choose s0(λ)>0 satisfying the following: there exists a constant C=C(s0,λ0)>0 such that

Ω(1sφ~1|x2v|2+sλ2φ~1|xv|2+s3λ4φ~13|v|2)e2sα~1𝑑xCΩ|A~v|2e2sα~1𝑑x

for all s>s0 and all vH2(Ω) satisfying v(0)=xv(0)=0.

We may prove Lemmas A.1 and A.2 by a direct method similar to the proof of the Carleman estimates for the second-order parabolic equations (see [43] and the references therein).

Acknowledgements

The author would like to thank the anonymous referees and board members for their careful reading, invaluable comments and useful suggestions.

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Received: 2016-04-24
Revised: 2017-11-05
Accepted: 2018-03-25
Published Online: 2018-04-11
Published in Print: 2018-10-01

© 2018 Walter de Gruyter GmbH, Berlin/Boston

Heruntergeladen am 10.12.2025 von https://www.degruyterbrill.com/document/doi/10.1515/jiip-2016-0029/pdf
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