Recovery of a general nonlinearity in the semilinear wave equation
Recovery of a general nonlinearity in the semilinear wave equation
复制标题
半线性波动方程中一般非线性的恢复
作者:
Antonio S'a Barreto;Plamen Stefanov
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.
影响因子:
1
作者:
Hintz, Peter;Uhlmann, Gunther;Zhai, Jian
通讯作者:
Zhai, Jian
影响因子:
2.4
作者:
Sá Barreto, Antônio;Stefanov, Plamen
通讯作者:
Stefanov, Plamen