In the large-charge EFT of neutrons, effective-range corrections to the two-point function first appear at second order in the effective range, and the deformed theory has a narrow but usable perturbative window for Q=3 to 6 final-state neutrons.
Effective-Range Dependence of Resonantly Interacting Fermions
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abstract
We extract the leading effective range corrections to the equation of state of the unitary Fermi gas from ab initio fixed-node quantum Monte Carlo (FNQMC) calculations in a periodic box using a density functional theory (DFT), and show them to be universal by considering several two-body interactions. Furthermore, we find that the DFT is consistent with the best available unbiased QMC calculations, analytic results, and experimental measurements of the equation of state. We also discuss the asymptotic effective-range corrections for trapped systems and present the first QMC results with the correct asymptotic scaling.
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Unnuclear matter at large-charge
In the large-charge EFT of neutrons, effective-range corrections to the two-point function first appear at second order in the effective range, and the deformed theory has a narrow but usable perturbative window for Q=3 to 6 final-state neutrons.