Optimized correlations inspired by perturbation theory
نویسندگان
چکیده
منابع مشابه
Optimized Perturbation Theory at Finite Temperature
An optimized perturbation theory (OPT) at finite temperature T , which resums higher order terms in the naive perturbation, is developed in O(N) φ theory. It is proved that (i) the renormalization of the ultra-violet divergences can be carried out systematically in any given order of OPT, and (ii) the Nambu-Goldstone theorem is fulfilled for arbitrary N and for any given order of OPT. The metho...
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The notion of the optimized perturbation, which has been successfully applied to energy eigenvalues, is generalized to treat wave functions of quantum systems. The key ingredient is to construct an envelope of a set of perturbative wave functions. This leads to a condition similar to that obtained from the principle of minimal sensitivity. Applications of the method to quantum anharmonic oscill...
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We study the optimized perturbation theory (OPT) at finite temperature, which is a selfconsistent resummation method. Firstly, we generalize the idea of the OPT to optimize the coupling constant in λφ theory, and give a proof of the renormalizability of this generalized OPT. Secondly, the principle of minimal sensitivity and the criterion of the fastest apparent convergence, which are condition...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2019
ISSN: 2469-9950,2469-9969
DOI: 10.1103/physrevb.99.195156