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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Nuclear Astrophysics IV
HK 33.3: Talk
Thursday, March 19, 2026, 14:15–14:30, PHIL A 602
Quantifying uncertainties for the nuclear equation of state in β-equilibrium — •Hannah Göttling1,2, Luis Hoff1,2, 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-density regime, chiral effective field theory (EFT) provides a systematically improvable description of nuclear systems. With Gaussian processes (GPs) we construct an emulator to realize non-parametric evaluations of the EOS considering correlations among independent variables and calculate derivatives to provide thermodynamic quantities. Moreover, we employ GPs for a statistical description of chiral expansion coefficients and apply Bayesian statistics to assess the EFT truncation errors. This leads to a range of the EOS for nuclear matter in β-equilibrium with propagated EFT truncation uncertainties.
Funded by the LOEWE Top Professorship LOEWE/4a/519/05.00.002(0014)98.
Keywords: equation of state; chiral effective field theory; Gaussian processes; uncertainty quantification