Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic mechanism of superconductivity   According to the theory of relativity, the relativistic Coulomb's force
between an electron pair is composed of two parts, the main part is repulsive,
while the rest part can be attractive in certain situations. Thus the
relativistic attraction of an electron pair provides an insight into the
mechanism of superconductivity. In superconductor, there are, probably at
least, two kinds of collective motions which can eliminate the repulsion
between two electrons and let the attraction being dominant, the first is the
combination of lattice and electron gas, accounting for traditional
superconductivity; the second is the electron gas themselves, accounting for
high $T_c$ superconductivity. In usual materials, there is a good balance
between the repulsion and attraction of an electron pair, the electrons are
regarded as free electrons so that Fermi gas theory plays very well. But in
some materials, when the repulsion dominates electron pairs, the electron gas
will has a behavior opposite to superconductivity. In the present paper the
superconducting states are discussed in terms of relativistic quantum theory in
details, some significant results are obtained including quantized magnetic
flux, London equation, Meissner effect and Josephson effect.

18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con