Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Active Brownian Heat Engines   When do non-equilibrium forms of disordered energy qualify as heat?
\textcolor{blue}{We address this question in the context of cyclically
operating heat engines in contact with a non-equilibrium energy reservoir that
defies the zeroth law of thermodynamics. To consistently address the latter as
a heat bath requires the existence of a precise mapping to an equivalent cycle
with an equilibrium bath at a time-dependent effective temperature. We identify
the most general setup for which this can generically be ascertained and
thoroughly discuss an analytically tractable, experimentally relevant
scenario}: a Brownian particle confined in a \textcolor{blue}{periodically}
modulated harmonic potential and coupled to some non-equilibrium bath of
variable activity. We deduce formal limitations for its thermodynamic
performance, including maximum efficiency, efficiency at maximum power, and
maximum efficiency at fixed power. They can guide the design of new
micro-machines and clarify how much these can outperform passive-bath designs,
which has been a debated issue for recent experimental realizations. To
illustrate the general principles for practical quasi-static and finite-rate
protocols, we further analyze a specific realization of such an active heat
engine based on the paradigmatic Active Brownian Particle (ABP) model. This
reveals some non-intuitive features of the explicitly computed dynamical
effective temperature, illustrates various conceptual and practical limitations
of the effective-equilibrium mapping, and clarifies the operational relevance
of various coarse-grained measures of dissipation.

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The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
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The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
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The categories of this paper are: stat