Tricritical Points and Liquid-Solid Critical Lines

Details Tricritical Points and Liquid-Solid Critical Lines Tricritical Points and Liquid-Solid Critical Lines

2009-02-26

arxiv.org/abs/0902.4578v1

In: C. Hobbs and S. Paycha (Editors), European Women in Mathematics: Proceedings of the 13th General Meeting, World Scientific

Physics

Condensed Matter

Statistical Mechanics

10 pages, 3 figures, to appear in EWM proceedings (2009)

Scientific paper

Tricritical points separate continuous and discontinuous symmetry breaking transitions. They occur in a variety of physical systems and their mathematical models. A tricritical point is used to determine a liquid-solid phase transition line in the pressure-temperature plane [Aitta, J. Stat. Mech., 2006]. Excellent experimental agreement has been obtained for iron, the material having the most high pressure data. This allows extrapolation to much higher pressures and temperatures than available experimentally. One can predict the temperature at the liquid-solid boundary in the core of the Earth where the pressure is 329 GPa. Light matter, present as impurities in the core fluid, is found to generate about a 600 K reduction of this temperature.

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