Keller, Jonas (2024)
Nuclear equation of state at finite temperature and proton fraction based on chiral effective field theory.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00028202
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
This thesis investigates the nuclear equation of state (EOS) using interactions among neutrons and protons based on chiral effective field theory (EFT). While nuclear matter is well studied microscopically at zero temperature for pure neutron matter and symmetric nuclear matter (with equal amounts of neutrons and protons), the general case is less explored. We present many-body calculations of the EOS for arbitrary temperatures and arbitrary neutron-proton asymmetries.
We first give a general overview of nuclear interactions and then introduce many-body perturbation theory (MBPT) as the method used in this thesis to determine the EOS, e.g., the pressure as function of the energy density, temperature, and proton fraction, from chiral two- and three-nucleon interactions up to next-to-next-to-next-to-leading order. Furthermore, we introduce Gaussian processes as a tool to interpolate calculated EOS data points and to determine thermodynamic derivatives.
As a starting point we calculate the EOS of neutron matter at finite temperatures with a particular focus on understanding thermal effects. The impact of nuclear interactions is studied systematically by considering different chiral two- and three-nucleon interactions. We then generalize these results to arbitrary proton fraction. For astrophysical applications the composition and pressure in beta equilibrium is determined based on the full asymmetry dependence of the EOS. Moreover, we explore the speed of sound and symmetry energy at finite temperature. For all results, theoretical uncertainty estimates based on the EFT expansion are provided.
Three further applications of these new calculations are presented. We determine the liquid-gas phase transition of symmetric nuclear matter and provide the critical temperature and density together with the phase diagram. Second, the phase coexistence at low proton concentrations is investigated at zero temperature with a focus on the possibility of proton drip. Finally, we explore the impact of muons on the composition in beta equilibrium and provide results for the speed of sound together with EFT and MBPT uncertainty estimates.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2024 | ||||
Autor(en): | Keller, Jonas | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Nuclear equation of state at finite temperature and proton fraction based on chiral effective field theory | ||||
Sprache: | Englisch | ||||
Referenten: | Schwenk, Prof. Ph.D Achim ; Arcones, Prof. Dr. Almudena | ||||
Publikationsjahr: | 12 November 2024 | ||||
Ort: | Darmstadt | ||||
Kollation: | 115 Seiten | ||||
Datum der mündlichen Prüfung: | 27 November 2023 | ||||
DOI: | 10.26083/tuprints-00028202 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28202 | ||||
Kurzbeschreibung (Abstract): | This thesis investigates the nuclear equation of state (EOS) using interactions among neutrons and protons based on chiral effective field theory (EFT). While nuclear matter is well studied microscopically at zero temperature for pure neutron matter and symmetric nuclear matter (with equal amounts of neutrons and protons), the general case is less explored. We present many-body calculations of the EOS for arbitrary temperatures and arbitrary neutron-proton asymmetries. We first give a general overview of nuclear interactions and then introduce many-body perturbation theory (MBPT) as the method used in this thesis to determine the EOS, e.g., the pressure as function of the energy density, temperature, and proton fraction, from chiral two- and three-nucleon interactions up to next-to-next-to-next-to-leading order. Furthermore, we introduce Gaussian processes as a tool to interpolate calculated EOS data points and to determine thermodynamic derivatives. As a starting point we calculate the EOS of neutron matter at finite temperatures with a particular focus on understanding thermal effects. The impact of nuclear interactions is studied systematically by considering different chiral two- and three-nucleon interactions. We then generalize these results to arbitrary proton fraction. For astrophysical applications the composition and pressure in beta equilibrium is determined based on the full asymmetry dependence of the EOS. Moreover, we explore the speed of sound and symmetry energy at finite temperature. For all results, theoretical uncertainty estimates based on the EFT expansion are provided. Three further applications of these new calculations are presented. We determine the liquid-gas phase transition of symmetric nuclear matter and provide the critical temperature and density together with the phase diagram. Second, the phase coexistence at low proton concentrations is investigated at zero temperature with a focus on the possibility of proton drip. Finally, we explore the impact of muons on the composition in beta equilibrium and provide results for the speed of sound together with EFT and MBPT uncertainty estimates. |
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Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-282026 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik | ||||
Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Theoretische Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Theoretische Kernphysik > Kernphysik und Nukleare Astrophysik |
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TU-Projekte: | DFG|SFB1245|A04 Schwenk | ||||
Hinterlegungsdatum: | 12 Nov 2024 10:11 | ||||
Letzte Änderung: | 13 Nov 2024 10:57 | ||||
PPN: | |||||
Referenten: | Schwenk, Prof. Ph.D Achim ; Arcones, Prof. Dr. Almudena | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 27 November 2023 | ||||
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