Non-compact Divergence Theorem: Is it Applicable to Scattering Problems?

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SUMMARY

The discussion centers on the applicability of the divergence theorem in non-compact domains, particularly in the context of scattering problems. The divergence theorem, traditionally proven under the assumption of a compact domain, is essential for relating integrals across dimensions. The participant highlights that their scattering problem involves boundaries extending infinitely and includes pointlike and virtual secondary sources. This indicates that while the traditional theorem requires compactness, adaptations may be necessary for specific applications in scattering theory.

PREREQUISITES
  • Understanding of the Divergence Theorem in vector calculus
  • Familiarity with scattering theory and boundary conditions
  • Knowledge of calculus in multiple dimensions
  • Concept of compact domains in mathematical analysis
NEXT STEPS
  • Research adaptations of the Divergence Theorem for non-compact domains
  • Explore scattering theory, focusing on boundary conditions and their implications
  • Study the mathematical treatment of pointlike sources in physics
  • Investigate virtual sources and their role in scattering problems
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Mathematicians, physicists, and engineers working on scattering problems, particularly those dealing with non-compact domains and boundary conditions in vector calculus.

geonat
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Are there versions of the divergence theorem that don't require a compact domain?

In my reference literature the divergence theorem is proved under the assumption that the domain is compact.
 
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I think divergence theorem require a domain that has "boundary", which is necessary for a "compact domain". Basically, divergence thm, along with the 1D Newton-Leibniz version, and the 2D Stoke's version, can be regarded as the basic thm of calculus in the first 3 dimensions. They apparently give a method of degrading an integral of a certain dimension into one of a lower dimension, with the latter be defined on the boundary of the domain of the former. Therefore, a compact domain should be sufficient to enable this process to happen.
 
Thank you for your reply.
I am working on a scattering problem, so part of my boundary lies infinitely far away. Moreover, another part of my boundary approaches pointlike sources, while yet another part of the boundary approaches virtual secondary sources on the boundary of the scattering object. But I think I got it right now.
 

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