Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum hydrogen vibrational dynamics in LiH: new neutron measurements
  and variational Monte Carlo simulations   Hydrogen single-particle dynamics in solid LiH at T=20 K has been studied
through the incoherent inelastic neutron scattering technique. A careful
analysis of the scattering data has allowed for the determination of a reliable
hydrogen-projected density of phonon states and, from this, of three relevant
physical quantities: mean squared displacement, mean kinetic energy, and
Einstein frequency. In order to interpret these experimental findings, a
fully-quantum microscopic calculation has been carried out using the
variational Monte Carlo method. The agreement achieved between neutron
scattering data and Monte Carlo estimates is good. In addition, a purely
harmonic calculation has been also performed via the same Monte Carlo code, but
anharmonic effects in H dynamics were not found relevant. The possible
limitations of the present semi-empirical potentials are finally discussed.

0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess