Journal of Statistical Physics

, Volume 168, Issue 3, pp 549–560 | Cite as

Rotational Brownian Motion: Trajectory, Reversibility and Stochastic Entropy

  • Swarnali Bandopadhyay
  • Debasish ChaudhuriEmail author
  • A. M. Jayannavar


Stochastic motion of macrospins is similar to driven diffusion of Brownian particles on the surface of a sphere. One crucial difference is in how the micro-states transform under time reversal. This dictates the form of stochastic entropy production (sEP). An excess sEP in the reservoir, in addition to a Clausius term, may appear depending on the interpretation of stochastic trajectory, thereby, precluding such analysis without a detailed knowledge of the governing dynamics. To show this, we derive expressions of sEP using Fokker–Planck equation, and the ratio of probability distributions of time-forward and time-reversed trajectories. We calculate probability distributions of sEP using numerical simulations, and obtain good agreement with the detailed fluctuation theorem. Within adiabatic approximation, analytic form for the distribution function is also derived.


Brownian motion Macrospin Fluctuation theorem 



SB and DC thank Sashideep Gutti for useful discussions. AMJ thanks DST, India for financial support. SB acknowledges DST, India for financial support through Grant No. SR/WOS-A/PM-52/2016.


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Institute of Physics, Sachivalaya MargBhubaneswarIndia
  2. 2.Homi Bhabha National Institute, AnushaktinagarMumbaiIndia
  3. 3.TIFR Centre for Interdisciplinary SciencesHyderabadIndia

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