18-22 September 2023
GSI Darmstadt, Germany
Europe/Berlin timezone

Nuclear EOS for arbitrary proton fraction and temperature based on chiral EFT and a Gaussian Process Emulator

21 Sep 2023, 08:30
Main Lecture Hall (GSI Darmstadt, Germany)

Main Lecture Hall

GSI Darmstadt, Germany

Südbau (SB1), GSI Campus
Oral Microscopic calculations of neutron-rich, dense nuclear matter Microscopic calculations of neutron-rich, dense nuclear matter


Kai Hebeler (TU Darmstadt)


We present results for the equation of state of asymmetric nuclear matter at finite temperature based on
chiral effective field theory interactions to next-to-next-to-next-to-leading order. Our results assess
the theoretical uncertainties from the many-body calculation and the chiral expansion. Using a
Gaussian process emulator for the free energy, we derive the thermodynamic properties of matter
through consistent derivatives and use the Gaussian process to access arbitrary proton fraction
and temperature. This enables a first nonparametric calculation of the equation of state in beta equilibrium, and of the speed of sound and the symmetry energy at finite temperature. Moreover, our results show that the thermal part of the pressure decreases with increasing densities.

Primary authors

Jonas Keller (TU Darmstadt) Prof. Achim Schwenk (TU Darmstadt) Kai Hebeler (TU Darmstadt)

Presentation Materials