| 21. | In the theory of pions, physics often uses the chiral perturbation theory.
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| 22. | The interaction rates are reviewed in and includes quantum perturbation theory and MD.
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| 23. | In practice, some kind of approximation ( perturbation theory ) is generally required.
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| 24. | Corrections for the masses of the quarks can be incorporated using chiral perturbation theory.
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| 25. | Modern research focuses both on the connection to perturbation theory and to string theory.
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| 26. | Such estimation is based on perturbation theory analysis.
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| 27. | Originally, Craik and Leibovich used perturbation theory.
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| 28. | In modern times, perturbation theory underlies much of quantum chemistry and quantum field theory.
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| 29. | In addition, current quarks possess one asymptotic freedom within the perturbation theory described limits.
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| 30. | Thus standard perturbation theory is applicable only in the vicinity of a Gaussian fixed point.
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