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perturbation theory

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.03 sec.
perturbation theory [‚pər·tər′bā·shən ‚thē·ə·rē]
(mathematics)
The study of the solutions of differential and partial differential equations from the viewpoint of perturbation of solutions.
(physics)
The theory of obtaining approximate solutions to the equations of motion of a physical system when these equations differ by a small amount from equations which can be solved exactly.


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We therefore have to abandon perturbation theory and look directly for eigenfunctions of the SCHRODINGER equation.
On the absorption spectrum of noble gases at the arc spectrum limit by Clark, Charles W. / Journal of Research of the National Institute of Standards and Technology
Here we describe a systematic analysis of neutron radiative [beta]-decay in the framework of heavy baryon chiral perturbation theory (HBCHPT) [7, 8, 9] and in the small scale expansion (SSE) [10], including all terms in O(1/M), i.
Radiative neutron [beta]-decay in effective field theory by Zhang, Chi / Journal of Research of the National Institute of Standards and Technology
have calculated the photon energy spectrum and photon polarization in a heavy baryon chiral perturbation theory (HB[chi]PT) including explicit [DELTA] degrees of freedom [3].
Detecting the radiative decay mode of the neutron by Byrne, J. / Journal of Research of the National Institute of Standards and Technology
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