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A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics
The state and evolution of planets, brown dwarfs and neutron star crusts is determined by the properties of dense and compressed matter. Due to the inherent difficulties in modelling strongly coupled plasmas, however, current predictions of transport coefficients differ by orders of magnitude. Colle...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5290263/ https://www.ncbi.nlm.nih.gov/pubmed/28134338 http://dx.doi.org/10.1038/ncomms14125 |
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author | Mabey, P. Richardson, S. White, T. G. Fletcher, L. B. Glenzer, S. H. Hartley, N. J. Vorberger, J. Gericke, D. O. Gregori, G. |
author_facet | Mabey, P. Richardson, S. White, T. G. Fletcher, L. B. Glenzer, S. H. Hartley, N. J. Vorberger, J. Gericke, D. O. Gregori, G. |
author_sort | Mabey, P. |
collection | PubMed |
description | The state and evolution of planets, brown dwarfs and neutron star crusts is determined by the properties of dense and compressed matter. Due to the inherent difficulties in modelling strongly coupled plasmas, however, current predictions of transport coefficients differ by orders of magnitude. Collective modes are a prominent feature, whose spectra may serve as an important tool to validate theoretical predictions for dense matter. With recent advances in free electron laser technology, X-rays with small enough bandwidth have become available, allowing the investigation of the low-frequency ion modes in dense matter. Here, we present numerical predictions for these ion modes and demonstrate significant changes to their strength and dispersion if dissipative processes are included by Langevin dynamics. Notably, a strong diffusive mode around zero frequency arises, which is not present, or much weaker, in standard simulations. Our results have profound consequences in the interpretation of transport coefficients in dense plasmas. |
format | Online Article Text |
id | pubmed-5290263 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-52902632017-02-07 A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics Mabey, P. Richardson, S. White, T. G. Fletcher, L. B. Glenzer, S. H. Hartley, N. J. Vorberger, J. Gericke, D. O. Gregori, G. Nat Commun Article The state and evolution of planets, brown dwarfs and neutron star crusts is determined by the properties of dense and compressed matter. Due to the inherent difficulties in modelling strongly coupled plasmas, however, current predictions of transport coefficients differ by orders of magnitude. Collective modes are a prominent feature, whose spectra may serve as an important tool to validate theoretical predictions for dense matter. With recent advances in free electron laser technology, X-rays with small enough bandwidth have become available, allowing the investigation of the low-frequency ion modes in dense matter. Here, we present numerical predictions for these ion modes and demonstrate significant changes to their strength and dispersion if dissipative processes are included by Langevin dynamics. Notably, a strong diffusive mode around zero frequency arises, which is not present, or much weaker, in standard simulations. Our results have profound consequences in the interpretation of transport coefficients in dense plasmas. Nature Publishing Group 2017-01-30 /pmc/articles/PMC5290263/ /pubmed/28134338 http://dx.doi.org/10.1038/ncomms14125 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Mabey, P. Richardson, S. White, T. G. Fletcher, L. B. Glenzer, S. H. Hartley, N. J. Vorberger, J. Gericke, D. O. Gregori, G. A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics |
title | A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics |
title_full | A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics |
title_fullStr | A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics |
title_full_unstemmed | A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics |
title_short | A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics |
title_sort | strong diffusive ion mode in dense ionized matter predicted by langevin dynamics |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5290263/ https://www.ncbi.nlm.nih.gov/pubmed/28134338 http://dx.doi.org/10.1038/ncomms14125 |
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