Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A macroscopic test of the Aharonov-Bohm effect   The Aharonov-Bohm (AB) effect is a purely quantum mechanical effect. The
original (classified as Type-I) AB-phase shift exists in experimental
conditions where the electromagnetic fields and forces are zero. It is the
absence of forces that makes the AB-effect entirely quantum mechanical.
Although the AB-phase shift has been demonstrated unambiguously, the absence of
forces in Type-I AB-effects has never been shown. Here, we report the
observation of the absence of time delays associated with forces of the
magnitude needed to explain the AB-phase shift for a macroscopic system.

2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int