Comment on "Ab Initio study of 40-Ca with an importance-truncated no-core shell model"

Abstract

In a recent Letter [Phys. Rev. Lett. 99, 092501 (2007)], Roth and Navratil present an importance-truncation scheme for the no-core shell model. The authors claim that their truncation scheme leads to converged results for the ground state of 40-Ca. We believe that this conclusion cannot be drawn from the results presented in the Letter. Furthermore, the claimed convergence is at variance with expectations of many-body theory. In particular, coupled-cluster calculations indicate that a significant fraction of the correlation energy is missing.

1 page, comment on arXiv:0705.4069 (PRL 99, 092501 (2007))

References in corpus (1)

• Benchmark calculations for 3H, 4He, 16O and 40Ca with ab-initio coupled-cluster theory

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