Speaker
Dr
Christian Drischler
(University of California, Berkeley and Lawrence Berkeley National Laboratory)
Description
The equation of state of (isospin-)asymmetric nuclear matter is a key quantity for nuclear astrophysics. In this talk, we discuss recent progress of microscopic calculations based on nuclear forces derived within chiral effective field theory and many-body perturbation theory. We focus in particular on applications of our improved normal-ordering method which enables the treatment of general three-body (3N) interactions starting from a partial-wave-decomposed form. Specifically, chiral 3N forces up to next-to-next-to-next-to-leading order (N$^3$LO) are now accessible in partial-wave based frameworks.
Applying these density-dependent effective two-body potentials to matter of arbitrary proton fractions, we show results for the equation of state, symmetry energy, incompressibility in conjugation with empirical parametrizations including the quadratic expansion in isospin-asymmetry. Furthermore, we elaborate on constructing equations of state up to the high central densities typically realized in neutron stars. These can then be used to constrain, e.g., mass-radius relations. Remarkably tight constraints have been obtained with our state-of-the-art equations of state.
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Primary author
Dr
Christian Drischler
(University of California, Berkeley and Lawrence Berkeley National Laboratory)
Co-authors
Prof.
Achim Schwenk
(Technische Universitaet Darmstadt)
Dr
Kai Hebeler
(Technische Universitaet Darmstadt)
