Hidden entropy production and work fluctuations in an ideal active gas

Suraj Shankar, M Cristina Marchetti

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Collections of self-propelled particles that move persistently by continuously consuming free energy are a paradigmatic example of active matter. In these systems, unlike Brownian "hot colloids," the breakdown of detailed balance yields a continuous production of entropy at steady state, even for an ideal active gas. We quantify the irreversibility for a noninteracting active particle in two dimensions by treating both conjugated and time-reversed dynamics. By starting with underdamped dynamics, we identify a hidden rate of entropy production required to maintain persistence and prevent the rapidly relaxing momenta from thermalizing, even in the limit of very large friction. Additionally, comparing two popular models of self-propulsion with identical dissipation on average, we find that the fluctuations and large deviations in work done are markedly different, providing thermodynamic insight into the varying extents to which macroscopically similar active matter systems may depart from equilibrium.

Original languageEnglish (US)
Article number020604
JournalPhysical Review E
Volume98
Issue number2
DOIs
StatePublished - Aug 30 2018

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Entropy Production
Fluctuations
entropy
Active Particles
Detailed Balance
Irreversibility
Colloids
propulsion
gases
Large Deviations
Persistence
Breakdown
colloids
Free Energy
Dissipation
Friction
Two Dimensions
Thermodynamics
Quantify
friction

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

Hidden entropy production and work fluctuations in an ideal active gas. / Shankar, Suraj; Marchetti, M Cristina.

In: Physical Review E, Vol. 98, No. 2, 020604, 30.08.2018.

Research output: Contribution to journalArticle

Shankar, Suraj ; Marchetti, M Cristina. / Hidden entropy production and work fluctuations in an ideal active gas. In: Physical Review E. 2018 ; Vol. 98, No. 2.
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