Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The melting curve of Sodium: a theoretical approach   New model describing the pressure effect on the melting temperature is
proposed by using four assumptions. One, the average wavelength of the phonon
vibration at the Debye temperature corresponds to the length of the unit cell.
Two, the phonon vibration at the melting temperature is in self-resonance with
the lattice vibration of the surface atomic/molecular layer. Three, the phonon
wavelength ratio of the Debye and the melting temperature does not be affected
by the pressure. Four the pressure reduces the anharmonic part of the
vibration. The relevant equations are derived and tested against the
experiments of sodium with positive result.

11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int