The solvability of a strongly-coupled nonlocal system of equations

The solvability of a strongly-coupled nonlocal system of equations
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强耦合非局部方程组的可解性

DOI:
10.1016/j.jmaa.2020.123919
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发表时间:
2020
影响因子:
1.3
通讯作者:
Scott, James M.
Scott, James M.
中科院分区:
数学3区
文献类型:
--
作者:
Mengesha, Tadele;Scott, James M.

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We prove existence and uniqueness of strong (pointwise) solutions to a linear nonlocal strongly coupled hyperbolic system of equations posed on all of Euclidean space. The system of equations comes from a linearization of a nonlocal model of elasticity in solid mechanics. It is a nonlocal analogue of the Navier-Lamé system of classical elasticity. We use a well-known semigroup technique that hinges on the strong solvability of the corresponding steady-state elliptic system. The leading operator is an integro-differential operator characterized by a distinctive matrix kernel which is used to couple differences of components of a vector field. For an operator possessing an asymmetric kernel comparable to that of the fractional Laplacian, we prove the L 2-solvability of the elliptic system in a Bessel potential space using the Fourier transform and a priori estimates. This L 2-solvability together with the Hille-Yosida theorem is used to prove the well posedness of the wave-type time dependent problem. For the fractional Laplacian kernel we extend the solvability to L p spaces using classical multiplier theorems.
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