Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Acoustic Rabi oscillations between gravitational quantum states and
  impact on symmetron dark energy   The standard model of cosmology provides a robust description of the
evolution of the universe. Nevertheless, the small magnitude of the vacuum
energy is troubling from a theoretical point of view. An appealing resolution
to this problem is to introduce additional scalar fields. However, these have
so far escaped experimental detection, suggesting some kind of screening
mechanism may be at play. Although extensive exclusion regions in parameter
space have been established for one screening candidate - chameleon fields -
another natural screening mechanism based on spontaneous symmetry breaking has
also been proposed, in the form of symmetrons 11. Such fields would change the
energy of quantum states of ultra-cold neutrons in the gravitational potential
of the earth. Here we demonstrate a spectroscopic approach based on the Rabi
resonance method that probes these quantum states with a resolution of E=2 x
10^(-15) eV. This allows us to exclude the symmetron as the origin of Dark
Energy for a large volume of the three-dimensional parameter space.

16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex