Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The odd ideal gas: Hall viscosity and thermal conductivity from
  non-Hermitian kinetic theory   The flow of momentum and energy in a fluid is typically associated with
dissipative transport coefficients: viscosity and thermal conductivity. Fluids
that break certain symmetries such as mirror symmetry and time-reversal
invariance can display non-dissipative transport coefficients called odd (or
Hall) viscosities and thermal conductivities. The goal of this paper is to
elucidate the microscopic origin of these dissipationless transport
coefficients using kinetic theory. We show that odd viscosity and odd thermal
conductivity arise when the linearized collision operator is not Hermitian.
This symmetry breaking occurs when collisions are chiral, i.e. not mirror
symmetric. To capture this feature in a minimalistic way, we introduce a
modified relaxation time approximation in which the distribution function is
rotated by an angle characterizing the average chirality of the collisions. In
the limit of an infinitesimal rotation, the effect of the parity-violating
collisions can be described as an emergent effective magnetic field.

20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an