Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum spirals   Quantum systems often exhibit fundamental incapability to entertain vortex.
The Meissner effect, a complete expulsion of the magnetic field (the
electromagnetic vorticity), for instance, is taken to be the defining attribute
of the superconducting state. Superfluidity is another, close-parallel example;
fluid vorticity can reside only on topological defects with a limited
(quantized) amount. Recent developments in the Bose-Einstein condensates
produced by particle traps further emphasize this characteristic. We show that
the challenge of imparting vorticity to a quantum fluid can be met through a
nonlinear mechanism operating in a hot fluid corresponding to a thermally
modified Pauli-Schroedinger spinor field. In a simple field-free model, we show
that the thermal effect, represented by a nonlinear, non-Hermitian Hamiltonian,
in conjunction with spin vorticity, leads to new interesting quantum states; a
spiral solution is explicitly worked out.

33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con