2017/10/31 by C. Drischler, K. Hebeler, A. Schwenk · 1 citation
Physics and Astronomy · #nucl-th #astro-ph.HE #nucl-ex
paper · pdf · doi:10.1103/physrevlett.122.042501
published as Phys. Rev. Lett. 122, 042501 (2019) · published version, incl. supplemental material
arxiv created 2019/02/02 · arxiv updated 2019/02/06
We present an efficient Monte Carlo framework for perturbative calculations of infinite nuclear matter based on chiral two-, three-, and four-nucleon interactions. The method enables the incorporation of all many-body contributions in a straightforward and transparent way, and makes it possible to extract systematic uncertainty estimates by performing order-by-order calculations in the chiral expansion as well as the many-body expansion. The versatility of this new framework is demonstrated by applying it to chiral low-momentum interactions, exhibiting a very good many-body convergence up to fourth order. Following these benchmarks, we explore new chiral interactions up to next-to-next-to-next-to-leading order (N3LO). Remarkably, simultaneous fits to the triton and to saturation properties can be achieved, while all three-nucleon low-energy couplings remain natural. The theoretical uncertainties of nuclear matter are significantly reduced when going from next-to-next-to-leading order to N3LO.