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Dual perturbation expansion for a classical $\lambda\phi^4$ field theory

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arxiv hep-th/0509125 v3 pith:IIY4NUCJ submitted 2005-09-15 hep-th cond-mat.otherhep-phmath-phmath.MP

classification hep-thcond-mat.otherhep-phmath-phmath.MP
keywords ordertheoryclassicalexpansionfieldlambdaleadingperturbation
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abstract

We prove the existence of a strong coupling expansion for a classical $\lambda\phi^4$ field theory in agreement with the duality principle in perturbation theory put forward in [M.Frasca, Phys. Rev. A 58, 3439 (1998)]. The leading order solution is a snoidal wave taking the place of plane waves of the free theory. We compute the first order correction and show that higher order terms do renormalize the leading order solution.

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