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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Nuclear Astrophysics IV
HK 32.5: Vortrag
Mittwoch, 12. März 2025, 17:00–17:15, SR 0.03 Erw. Physik
Uncertainty quantification for the nuclear equation of state — •Hannah Göttling1,2, Kai Hebeler1,2,3, and Achim Schwenk1,2,3 — 1Technische Universität Darmstadt, Department of Physics — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Planck-Institut für Kernphysik, Heidelberg
The nuclear equation of state (EOS) characterizes the properties of matter as a function of density, temperature, and proton fraction, and thus connects microscopic strong interaction calculations with descriptions of compact objects in astrophysics. Focusing on the low-energy regime, chiral effective field theory (EFT) provides a systematically improvable description of nuclear systems. With Gaussian processes (GPs) we introduce a tool to realize non-parametric evaluations of the EOS, considering correlations along independent variables. This further enables us to calculate derivatives to provide thermodynamic quantities. Besides constructing an emulator we use GPs for a statistical description of chiral expansion coefficients and apply Bayesian statistics to assess the EFT truncation errors. With that we are able to provide the nuclear EOS for nuclear matter in β-equilibrium with propagated chiral uncertainties.
Funded by the research cluster ELEMENTS (Project ID 500/10.006) and by the DFG – Project-ID 279384907 – SFB 1245.
Keywords: equation of state; chiral effective field theory; Gaussian processes; uncertainty quantification