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Phys Rev Lett. 2013 Jan 18;110(3):032504. Epub 2013 Jan 15.

Neutron matter at next-to-next-to-next-to-leading order in chiral effective field theory.

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Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.


Neutron matter presents a unique system for chiral effective field theory because all many-body forces among neutrons are predicted to next-to-next-to-next-to-leading order (N(3)LO). We present the first complete N(3)LO calculation of the neutron matter energy. This includes the subleading three-nucleon forces for the first time and all leading four-nucleon forces. We find relatively large contributions from N(3)LO three-nucleon forces. Our results provide constraints for neutron-rich matter in astrophysics with controlled theoretical uncertainties.

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