title: Constraints on neutron star radii based on chiral effective field theory interactions.
abstract: We show that microscopic calculations based on chiral effective field theory interactions constrain the properties of neutron-rich matter below nuclear densities to a much higher degree than is reflected in commonly used equations of state. Combined with observed neutron star masses, our results lead to a radius R=9.7-13.9  km for a 1.4M⊙ star, where the theoretical range is due, in about equal amounts, to uncertainties in many-body forces and to the extrapolation to high densities.
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada.
authors.forename: K
authors.initials: K
authors.lastname: Hebeler
authors.forename: J M
authors.initials: JM
authors.lastname: Lattimer
authors.forename: C J
authors.initials: CJ
authors.lastname: Pethick
authors.forename: A
authors.initials: A
authors.lastname: Schwenk