Data di Pubblicazione:
2012
Citazione:
An efficient method to evaluate energy variances for extrapolation methods / G. Puddu. - In: JOURNAL OF PHYSICS. G, NUCLEAR AND PARTICLE PHYSICS. - ISSN 0954-3899. - 39:8(2012 Aug), pp. 085108.1-085108.10.
Abstract:
The energy variance extrapolation method consists of relating the approximate
energies in many-body calculations to the corresponding energy variances and
inferring eigenvalues by extrapolating to zero variance. The method needs a
fast evaluation of the energy variances. For many-body methods that expand
the nuclear wavefunctions in terms of deformed Slater determinants, the best
available method for the evaluation of energy variances scales with the sixth
power of the number of single-particle states. We propose a new method which
depends on the number of single-particle orbits and the number of particles
rather than the number of single-particle states. We discuss as an example the
case of 4 He using the chiral N3LO interaction in a basis consisting up to 184
single-particle states.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
G. Puddu
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