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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Nuclear Astrophysics I
HK 2.6: Vortrag
Montag, 11. März 2024, 18:15–18:30, HBR 14: HS 4
Gaussian processes for the nuclear equation of state — •Hannah Göttling1,2, Jonas Keller1,2, 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. 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. The evaluation of observables with GPs enables us to further calculate derivatives. With that we are able to provide the pressure and other thermodynamic quantities of pure neutron matter and symmetric nuclear matter with propagated chiral truncation 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; Bayesian statistics; uncertainty quantification