Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absolute proof that hydrogen-antihydrogen oscillations occur in nature   Detecting H-antiH oscillations is intimately connected with the existence of
natural antiH. We detect natural H-antiH oscillations, generated by a classical
spin-free Coulomb quantum gap, which we calculate analytically without any
parameter. Oscillation times are much smaller than those predicted with the
Standard Model. These unprecedented results also remove the so-called problem
with matter-antimatter asymmetry in the Universe.

35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys