Effect of Coulomb screening length on nuclear "pasta" simulations

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We study the role of the effective Coulomb interaction strength and length on the dynamics of nucleons in conditions according to those in a neutron star's crust. Calculations were made with a semiclassical molecular dynamics model, studying isospin symmetric matter at subsaturation densities a...

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Autor principal: Dorso, Claudio Oscar
Publicado: 2014
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562813_v89_n5_p_Alcain
http://hdl.handle.net/20.500.12110/paper_05562813_v89_n5_p_Alcain
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_05562813_v89_n5_p_Alcain2023-06-08T15:41:59Z Effect of Coulomb screening length on nuclear "pasta" simulations Dorso, Claudio Oscar We study the role of the effective Coulomb interaction strength and length on the dynamics of nucleons in conditions according to those in a neutron star's crust. Calculations were made with a semiclassical molecular dynamics model, studying isospin symmetric matter at subsaturation densities and low temperatures. The electrostatic interaction between protons is included as a screened Coulomb potential in the spirit of the Thomas-Fermi approximation, but the screening length is artificially varied to explore its effect on the formation of the nonhomogeneous nuclear structures known as "nuclear pasta." As the screening length increases, we can see a transition from a one-per-cell pasta regime (due exclusively to finite-size effects) to a more appealing multiple pasta per simulation box. This qualitative difference in the structure of neutron star matter at low temperatures shows that special caution should be taken when the screening length is estimated for numerical simulations. © 2014 American Physical Society. Fil:Dorso, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562813_v89_n5_p_Alcain http://hdl.handle.net/20.500.12110/paper_05562813_v89_n5_p_Alcain
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We study the role of the effective Coulomb interaction strength and length on the dynamics of nucleons in conditions according to those in a neutron star's crust. Calculations were made with a semiclassical molecular dynamics model, studying isospin symmetric matter at subsaturation densities and low temperatures. The electrostatic interaction between protons is included as a screened Coulomb potential in the spirit of the Thomas-Fermi approximation, but the screening length is artificially varied to explore its effect on the formation of the nonhomogeneous nuclear structures known as "nuclear pasta." As the screening length increases, we can see a transition from a one-per-cell pasta regime (due exclusively to finite-size effects) to a more appealing multiple pasta per simulation box. This qualitative difference in the structure of neutron star matter at low temperatures shows that special caution should be taken when the screening length is estimated for numerical simulations. © 2014 American Physical Society.
author Dorso, Claudio Oscar
spellingShingle Dorso, Claudio Oscar
Effect of Coulomb screening length on nuclear "pasta" simulations
author_facet Dorso, Claudio Oscar
author_sort Dorso, Claudio Oscar
title Effect of Coulomb screening length on nuclear "pasta" simulations
title_short Effect of Coulomb screening length on nuclear "pasta" simulations
title_full Effect of Coulomb screening length on nuclear "pasta" simulations
title_fullStr Effect of Coulomb screening length on nuclear "pasta" simulations
title_full_unstemmed Effect of Coulomb screening length on nuclear "pasta" simulations
title_sort effect of coulomb screening length on nuclear "pasta" simulations
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562813_v89_n5_p_Alcain
http://hdl.handle.net/20.500.12110/paper_05562813_v89_n5_p_Alcain
work_keys_str_mv AT dorsoclaudiooscar effectofcoulombscreeninglengthonnuclearpastasimulations
_version_ 1768544414422007808

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