Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shock Response and Phase Transitions of MgO at Planetary Impact
  Conditions   The moon-forming impact and the subsequent evolution of the proto-Earth is
strongly dependent on the properties of materials at the extreme conditions
generated by this violent collision. We examine the high pressure behavior of
MgO, one of the dominant constituents in the earth's mantle, using
high-precision, plate impact shock compression experiments performed on Sandia
National Laboratories Z-Machine and extensive quantum simulations using Density
Functional Theory (DFT) and quantum Monte Carlo (QMC). The combined data span
from ambient conditions to 1.2 TPa and 42,000 K, showing solid-solid and
solid-liquid phase boundaries. Furthermore our results indicate under impact
that the solid and liquid phases coexist for more than 100 GPa, pushing
complete melting to pressures in excess of 600 GPa. The high pressure required
for complete shock melting places a lower bound on the relative velocities
required for the moon forming impact.

22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat