Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bistable solutions for the electron energy distribution function in
  electron swarms in xenon via Boltzmann equation analysis and particle
  simulations   At low reduced electric fields the electron energy distribution function in
heavy noble gases can take two distinct shapes. This "bistability effect" - in
which electron-electron (Coulomb) collisions play an essential role - is
analyzed here for Xe with a Boltzmann equation approach and with a first
principles particle simulation method. The solution of the Boltzmann equation
adopts the usual approximations of (i) searching for the distribution function
in the form of two terms ("two-term approximation"), (ii) neglecting the
Coulomb part of the collision integral for the anisotropic part of the
distribution function, (iii) treating Coulomb collisions as binary events, and
(iv) truncating the range of the electron-electron interaction beyond a
characteristic distance. The particle-based simulation method avoids these
approximations: the many-body interactions within the electron gas with a true
(un- truncated) Coulomb potential are described by a Molecular Dynamics
algorithm, while the collisions between electrons and the background gas atoms
are treated with Monte Carlo simulation. We find a good general agreement
between the results of the two techniques, which confirms, to a certain extent,
the approximations used in the solution of the Boltzmann equation. The
differences observed between the results are believed to originate from these
approximations and from the presence of statistical noise in the particle
simulations.

17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs