Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of Field Direction and Field Intensity on Directed Spiral
  Percolation   Directed spiral percolation (DSP) is a new percolation model with crossed
external bias fields. Since percolation is a model of disorder, the effect of
external bias fields on the properties of disordered systems can be studied
numerically using DSP. In DSP, the bias fields are an in-plane directional
field ($E$) and a field of rotational nature ($B$) applied perpendicular to the
plane of the lattice. The critical properties of DSP clusters are studied here
varying the direction of $E$ field and intensities of both $E$ and $B$ fields
in 2 dimensions. The system shows interesting and unusual critical behaviour at
the percolation threshold. Not only the universality class of DSP model is
found to belong in a new universality class than that of other percolation
models but also the universality class remains invariant under the variation of
$E$ field direction. Varying the intensities of the $E$ and $B$ fields, a
crossover from DSP to other percolation models has been studied. A phase
diagram of the percolation models is obtained as a function of intensities of
the bias fields $E$ and $B$.

32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
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
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex