In physics and applied mathematics, analytical regularization is a technique used to convert boundary value problems which can be written as Fredholm integral equations of the first kind involving singular operators into equivalent Fredholm integral equations of the second kind. The latter may be easier to solve analytically and can be studied with discretization schemes like the finite element method or the finite difference method because they are pointwise convergent. In computational electromagnetics, it is known as the method of analytical regularization. It was first used in mathematics during the development of operator theory before acquiring a name.[1]

Method

Analytical regularization proceeds as follows. First, the boundary value problem is formulated as an integral equation. Written as an operator equation, this will take the form

with representing boundary conditions and inhomogeneities, representing the field of interest, and the integral operator describing how Y is given from X based on the physics of the problem. Next, is split into , where is invertible and contains all the singularities of and is regular. After splitting the operator and multiplying by the inverse of , the equation becomes

or

which is now a Fredholm equation of the second type because by construction is compact on the Hilbert space of which is a member.

In general, several choices for will be possible for each problem.[1]

References

  1. 1 2 Nosich, A.I. (1999). "The method of analytical regularization in wave-scattering and eigenvalue problems: foundations and review of solutions". IEEE Antennas and Propagation Magazine. Institute of Electrical and Electronics Engineers (IEEE). 41 (3): 34–49. Bibcode:1999IAPM...41...34N. doi:10.1109/74.775246. ISSN 1045-9243.
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