Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hidden scale invariance at high pressures in gold and five other fcc
  metal crystals   Recent DFT (density functional theory) simulations showed that metals have a
hitherto overlooked symmetry termed "hidden scale invariance" [Hummel {\em et
al.}, Phys. Rev. B {\bf{92}}, 174116 (2015)]. According to isomorph theory,
this scaling property implies the existence of lines in the thermodynamic phase
diagram, so-called isomorphs, along which structure and dynamics are invariant
to a good approximation when given in properly reduced units. This means that
the phase diagram becomes effectively one-dimensional with regard to several
physical properties. This paper investigates consequences and implications of
the isomorph theory in six metallic crystals; Au, Ni, Cu, Pd, Ag and Pt. The
data are obtained from molecular dynamics simulations employing many body
'effective medium theory' (EMT) to model the atomic interactions realistically.
We test the predictions from isomorph theory for structure and dynamics by
means of the radial distribution and the velocity autocorrelation functions, as
well as the rather dramatic prediction of instantaneous equilibration after a
jump between two isomorphic points. Many properties of crystals tend to be
dominated by defects and many of the properties associated with these defects
are expected to be isomorph invariant as well. This is investigated in this
paper for the case of vacancy diffusion. We find the predicted invariance of
structure and also of dynamics, though less rigorous. We show results on the
variation of the density scaling exponent $\gamma$, which can be related to the
Gr\"uneisen-parameter, for all six metals. We consider large density changes up
to a factor of two, corresponding to very high pressures. Unlike systems
modelled using the Lennard-Jones potential where the density scaling-exponent
$\gamma$ is almost constant, it varies substantially when using the EMT
potential and is also strongly material dependent.

31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th