Alexandros Gezerlis

Low-density neutron matter

The properties of low-density neutron matter are important for the understanding of neutron star crusts and the exterior of large neutron-rich nuclei. We examine various properties of dilute neutron matter using quantum Monte Carlo methods, with

Strongly paired fermions : Cold atoms and neutron matter

s

Local chiral effective field theory interactions and quantum Monte Carlo applications

- and

Chiral Three-Nucleon Interactions in Light Nuclei, Neutron-α Scattering, and Neutron Matter.

p

Resonantly interacting fermions in a box.

-wave terms in the interaction. Our results provide a smooth evolution of the equation of state and pairing gap from extremely small densities, where analytic expressions are available, up to the strongly interacting regime probed experimentally and described theoretically in cold atomic systems, where

Quantum Monte Carlo calculations of neutron matter with chiral three-body forces

{k}_{F}\ensuremath{\approx}0.5 {\text{fm}}^{\ensuremath{-}1}

Neutron Matter from Low to High Density

and the pairing gap becomes of the order of magnitude of the Fermi energy. We also present results for the momentum distribution and pair distributions, displaying the same evolution from weak to strong coupling. Combined with previous quantum Monte Carlo and other calculations at moderate densities, these results provide strong constraints on the neutron matter equation of state up to saturation densities.

Mixed-spin pairing condensates in heavy nuclei.

Experiments with cold Fermi atoms can be tuned to probe strongly-interacting fluids that are very similar to the low-density neutron matter found in the crusts of neutron stars. In contrast to traditional superfluids and superconductors, matter in this regime is very strongly paired, with gaps of the order of the Fermi energy. We compute the

Heavy-light fermion mixtures at unitarity

T=0

Quantum Monte Carlo calculations of light nuclei with local chiral two- and three-nucleon interactions

equation of state and pairing gap for cold atoms and low-density neutron matter as a function of the Fermi momentum times the scattering length. Results of quantum Monte Carlo calculations show that the equations of state are very similar. The neutron matter pairing gap at low densities is found to be very large but, except at the smallest densities, significantly suppressed relative to cold atoms because of the finite effective range in the neutron-neutron interaction.