Recovery of a general nonlinearity in the semilinear wave equation

Recovery of a general nonlinearity in the semilinear wave equation
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半线性波动方程中一般非线性的恢复

DOI:
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发表时间:
2021
影响因子:
1.4
通讯作者:
Plamen Stefanov
Plamen Stefanov
中科院分区:
数学4区
文献类型:
--
作者:
Antonio S'a Barreto;Plamen Stefanov

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研究了半线性波动方程utt − Δ u + f(t,x,u)= 0中恢复非线性项f(t,x,u)的反问题,其中f(t,x,u)在x上是紧支撑的.我们用波长为λ h、振幅为λ 1的复值或实值谐波探测介质。他们传播的制度,其中的非线性影响的次主要,但不是主要的条款,除了零次谐波。当透射波离开supp x f时,我们测量它。证明了当f(t,x,u)是u的奇函数时,可以恢复f(t,x,u);当f(t,x,u)= α(x)u2 m时,可以恢复α(x).当h → 0时,这是以显式的方式完成的。
We study the inverse problem of recovery a nonlinearity f ( t , x , u ), which is compactly supported in x, in the semilinear wave equation u tt − Δ u + f ( t , x , u ) = 0. We probe the medium with either complex or real-valued harmonic waves of wavelength ∼ h and amplitude ∼ 1. They propagate in a regime where the nonlinearity affects the subprincipal but not the principal term, except for the zeroth harmonics. We measure the transmitted wave when it exits supp x f. We show that one can recover f ( t , x , u ) when it is an odd function of u, and we can recover α ( x ) when f ( t , x , u ) = α ( x ) u 2 m . This is done in an explicit way as h → 0.
DOI: 10.1093/imrn/rnab088
发表时间: 2021
影响因子: 1
作者:
Hintz, Peter;Uhlmann, Gunther;Zhai, Jian
通讯作者: Zhai, Jian
DOI: 10.1007/s00220-022-04359-0
发表时间: 2022
影响因子: 2.4
作者:
Sá Barreto, Antônio;Stefanov, Plamen
通讯作者: Stefanov, Plamen