Rayleigh-Ritz variation method and connected-moments polynomial approach
classification
🧮 math-ph
math.MP
keywords
connected-momentsapproachmethodpolynomialrayleigh-ritzvariationanharmoniccompare
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We show that the connected-moments polynomial approach proposed recently is equivalent to the well known Rayleigh-Ritz variation method in the Krylov space. We compare the latter with one of the original connected-moments methods by means of a numerical test on an anharmonic oscillator
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