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      To which densities is spin-polarized neutron matter a weakly interacting Fermi gas?

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          Abstract

          We study the properties of spin-polarized neutron matter at next-to-next-to-next-to-leading order in chiral effective field theory, including two-, three-, and four-neutron interactions. The energy of spin-polarized neutrons is remarkably close to a non-interacting system at least up to saturation density, where interaction effects provide less than 10% corrections. This shows that the physics of neutron matter is similar to a unitary gas well beyond the scattering-length regime. Implications for energy-density functionals and for a possible ferromagnetic transition in neutron stars are discussed. Our predictions can be tested with lattice QCD, and we present results for varying pion mass.

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          Author and article information

          Journal
          2014-08-18
          2015-03-25
          Article
          10.1016/j.physletb.2015.03.027
          1408.4168
          79212890-7c5c-4aee-8aae-5c20ace9f928

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          INT-PUB-14-029
          Phys. Lett. B 744, 18 (2015)
          5 pages, 4 figures, minor changes, published version
          nucl-th astro-ph.SR hep-ph

          High energy & Particle physics,Nuclear physics,Solar & Stellar astrophysics

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