Erlangen 2026 – wissenschaftliches Programm

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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 12: Relativistic Astrophysics III / Gravitational waves III

GR 12.1: Vortrag

Donnerstag, 19. März 2026, 13:45–14:00, KH 01.016

The Thermal Index for Interacting Fermi Gases — •Timon Kleiber, Ishfaq Ahmad Rather, Selina Kunkel, Sarah Pitz, and Jürgen Schaffner-Bielich — Goethe Universität Frankfurt, Institut für Theoretische Physik

We analyze and compare the influence a simple repulsive interaction between particles has on a single component Fermi gas. Our focus is on the thermal part of the equation of state. This model can be used to calculate an EOS at nonvanishing temperature for pure neutron matter or fermionic dark matter. The coupling constant for the interactions uses the scale of strong interactions as a baseline. We additionally look at the effects of higher and lower coupling strengths with respect to the QCD baseline. A special focus is put on the isentropes within the area that is relevant for Proto-Neutron star evolution and or thermal evolution of fermonic dark matter. The inclusion of interactions leads to an increase in pressure compared to energy density along the isentropes and causes their ratio to reach values above the maximum limit without interactions.

Keywords: Isentropes; Equation of State; Fermi Gas; Thermal Index