Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zonal profile corrugations and staircase formation: Role of the
  transport crossphase   Recently, quasi-stationary structures called $E \times B$ staircases were
observed in gyrokinetic simulations, in all transport channels [Dif-Pradalier
et al. Phys. Rev. Lett. 114, 085004 (2015)]. We present a novel analytical
theory - supported by collisional drift-wave fluid simulations - for the
generation of density profile corrugations (staircase), independent of the
action of zonal flows: Turbulent fluctuations self-organize to generate
quasi-stationary radial modulations $\Delta\theta(r,t)$ of the transport
crossphase $\theta$ between density and electric potential fluctuations. The
radial modulations of the associated particle flux drive zonal corrugations of
the density profile, via a modulational instability. In turn, zonal density
corrugations regulate the turbulence via nonlinear damping of the fluctuations.

10
The categories of this paper are: q-bio
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The categories of this paper are: stat
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
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The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
18
The categories of this paper are: econ