# Connecting neutron star observations to three-body forces in neutron matter and to the nuclear symmetry energy

### Steiner and Gandolfi (2012)

Figure: Left side: Constraints on the three-neutron force parameters, right side: constraints on $L$.

Summary:

In collaboration with Stefano Gandolfi (LANL), I combined neutron star mass and radius observations with recent results from quantum Monte Carlo on the equation of state of neutron matter to obtain: limits on the strength of three-neutron forces, the density dependence of the nuclear symmetry energy, and the size of the neutron skin thickness in lead. In particular the constraints on $L$, a parameter which measures the density dependence of the symmetry energy are strong: we find $L$ to be relatively small.

These results are published in Phys. Rev. Lett. 108 (2012) 081102 .