Universität zu Köln

Mehta, Parit, Nandi, Rana, Gomes, Rosana de Oliveira, Dexheimer, Veronica ORCID: 0000-0001-5578-2626 and Steinheimer, Jan (2022). Low Density Neutron Star Matter with Quantum Molecular Dynamics: The Role of Isovector Interactions. Universe, 8 (7). BASEL: MDPI. ISSN 2218-1997

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Abstract

The effect of isospin-dependent nuclear forces on the inner crust of neutron stars is modeled within the framework of Quantum Molecular Dynamics (QMD). To successfully control the density dependence of the symmetry energy of neutron-star matter below nuclear saturation density, a mixed vector-isovector potential is introduced. This approach is inspired by the baryon density and isospin density-dependent repulsive Skyrme force of asymmetric nuclear matter. In isospin-asymmetric nuclear matter, the system shows nucleation, as nucleons are arranged into shapes resembling nuclear pasta. The dependence of clusterization in the system on the isospin properties is also explored by calculating two-point correlation functions. We show that, as compared to previous results that did not involve such mixed interaction terms, the energy symmetry slope L is successfully controlled by varying the corresponding coupling strength. Nevertheless, the effect of changing the slope of the nuclear symmetry energy L on the crust-core transition density does not seem significant. To the knowledge of the authors, this is the first implementation of such a coupling in a QMD model for isospin asymmetric matter, which is relevant to the inner crust of neutron and proto-neutron stars.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mehta, Parit UNSPECIFIED UNSPECIFIED UNSPECIFIED Nandi, Rana UNSPECIFIED UNSPECIFIED UNSPECIFIED Gomes, Rosana de Oliveira UNSPECIFIED UNSPECIFIED UNSPECIFIED Dexheimer, Veronica UNSPECIFIED orcid.org/0000-0001-5578-2626 UNSPECIFIED Steinheimer, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-682467
DOI:	10.3390/universe8070380
Journal or Publication Title:	Universe
Volume:	8
Number:	7
Date:	2022
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2218-1997
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NUCLEAR-MATTER; EQUATION Multiple languages Astronomy & Astrophysics; Physics, Particles & Fields Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68246