Ab Initio Calculation of the Miscibility Diagram for Hydrogen-Helium Mixtures

Manuel Schöttler and Ronald Redmer
Phys. Rev. Lett. 120, 115703 – Published 16 March 2018
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Abstract

We use finite-temperature density functional theory coupled to classical molecular dynamics simulation to calculate the miscibility gap of hydrogen-helium mixtures. The van der Waals density functional (vdW-DF) theory is used, which leads to lower demixing temperatures compared to computations using the Perdew-Burke-Ernzerhof functional. Our calculations suggest that current Jupiter models are most likely too hot to allow demixing in the interior. A Jupiter isentrope based on our vdW-DF data is presented. Our demixing phase diagram still predicts phase separation in Saturn, but in a significantly reduced fraction of its volume.

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  • Received 14 November 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.115703

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsStatistical Physics & ThermodynamicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

Manuel Schöttler* and Ronald Redmer

  • Institut für Physik, Universität Rostock, D-18051 Rostock, Germany

  • *manuel.schoettler@uni-rostock.de

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Issue

Vol. 120, Iss. 11 — 16 March 2018

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