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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Nuclear Astrophysics IV
HK 32.3: Vortrag
Mittwoch, 12. März 2025, 16:30–16:45, SR 0.03 Erw. Physik
Perturbative quantum chromodynamics constraints on the dense matter equation of state in a Bayesian inference framework — •Anna Hensel1, Melissa Mendes1,2,3, Isak Svensson1,2,3, 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
We investigate how perturbative quantum chromodynamics (pQCD) calculations at high densities constrain equation of state (EOS) posteriors from a Bayesian inference framework at neutron-star densities. To construct the EOS we use calculations from chiral effective field theory and implement a polytropic (PP) and a speed of sound (CS) high-density extension. The EOS is further constrained by neutron star observations, including gravitational-wave and NICER measurements. We find that pQCD calculations have a small effect on the posteriors in the CS case, and no noticable effect in the PP case.
*Funded by ERC Grant Agreement No. 101020842
Keywords: Nuclear equation of state; neutron stars; GW and NICER observations; Bayesian inference