Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Melting of MgO studied using a multicanonical ensemble method combined
  with a first-principles calculation   Melting of MgO was studied using a multicanonical ensemble method combined
with a first-principles calculation. This approach has been successively
performed by using a rather simple functional form for a model inter-atomic
potential that is determined from first-principles and a novel approximation
treating auxiliary degrees of freedom, such as electron thermal excitations,
within a multicanonical ensemble method. Although a rather simple model
potential was used, this approach could distinguish differences due to the
exchange-correlation potential used in the first-principles calculations. The
pressure dependence of the melting point, latent heat, and volume change during
melting were studied. The obtained dependence was similar to that reported by
Alfe which differs from experimental results. This dependence did not change
even with the PBEsol exchange-correlation potential.

12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex