Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Mabey, P., Richardson, S., White, T. G., Fletcher, L. B., Glenzer, S. H., Hartley, N. J., Vorberger, J., Gericke, D. O., Gregori, G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
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
_version_ 1782504607551848448
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
work_keys_str_mv AT mabeyp astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT richardsons astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT whitetg astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT fletcherlb astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT glenzersh astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT hartleynj astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT vorbergerj astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT gerickedo astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT gregorig astrongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT mabeyp strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT richardsons strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT whitetg strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT fletcherlb strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT glenzersh strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT hartleynj strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT vorbergerj strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT gerickedo strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics
AT gregorig strongdiffusiveionmodeindenseionizedmatterpredictedbylangevindynamics