Hamburg 2016 – wissenschaftliches Programm

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SYDI: Symposium GR-HK-T Disserstationspreis

SYDI 1: GR-HK-T Dissertationspreis

SYDI 1.4: Hauptvortrag

Montag, 29. Februar 2016, 15:30–16:00, VMP4 Audimax 1

Quantum Monte Carlo calculations with chiral effective field theory interactions — •Ingo Tews — Institute for Nuclear Theory, University of Washington, Seattle — Institut für Kernphysik, Technische Universität Darmstadt

The neutron-matter equation of state connects several physical systems over a wide density range, from cold atomic gases in the unitary limit at low densities, to neutron-rich nuclei at intermediate densities, up to neutron stars which reach supranuclear densities in their core. An accurate description of the neutron-matter equation of state is therefore crucial to describe these systems. To calculate the neutron-matter equation of state reliably, precise many-body methods in combination with a systematic theory for nuclear forces are needed. Chiral effective field theory (EFT) is such a theory and provides a systematic framework for the description of low-energy hadronic interactions with controlled theoretical uncertainties. On the other hand, continuum Quantum Monte Carlo (QMC) methods are among the most precise many-body methods available to study strongly interacting systems at finite densities, but require as input local interactions. However, chiral EFT, which is naturally formulated in momentum space, contains several sources of nonlocality.

I discuss how to combine these two powerful approaches, and present results of first QMC calculations for pure neutron systems. These results serve as nonperturbative benchmarks for the neutron-matter equation of state and pave the way for systematic QMC calculations with chiral EFT interactions for nuclei and nucleonic matter.