Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pressure, surface tension and curvature in active systems: A touch of
  equilibrium   We explore the pressure of active particles on curved surfaces and its
relation to other interfacial properties. We use both direct simulations of the
active systems as well as simulations of an equilibrium system with effective
(pair) interactions designed to capture the effects of activity. Comparing the
active and effective passive systems in terms of their bulk pressure, we
elaborate that the most useful theoretical route to this quantity is via the
density profile at a flat wall. This is corroborated by extending the study to
curved surfaces and establishing a connection to the particle adsorption and
integrated surface excess pressure (surface tension). In the ideal-gas limit,
the effect of curvature on the mechanical properties can be calculated
analytically in the passive system with effective interactions, and shows good
(but not exact) agreement with simulations of the active models. It turns out
that even the linear correction to the pressure is model specific and equals
the planar adsorption in each case, which means that a known equilibrium sum
rule can be extended to a regime at small but nonzero activity. In turn, the
relation between the planar adsorption and the surface tension is reminiscent
of the Gibbs adsorption theorem at an effective temperature. At finite
densities, where particle interactions play a role, the presented
effective-potential approximation captures the effect of density on the
dependence of the pressure on curvature.

33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin