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On the Inertial Rotational Brownian Motion of Arbitrarily Shaped Particles

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arxiv 2303.07021 v1 pith:E5AOCSZV submitted 2023-03-13 cond-mat.stat-mech math-phmath.MP

classification cond-mat.stat-mechmath-phmath.MP
keywords browniandistributioninertialmotionparticlesrotationalallowsangular
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This article reports the modeling of inertial rotational Brownian motion as an Ornstein-Uhlenbeck process evolving on the cotangent bundle of the rotation group, SO(3). The benefit of this approach and the use of a different parameterization of rotations allows the handling of particles with arbitrary shapes, without requiring any simplifying assumptions on the shape or the structure of the viscosity tensors. The resultant Fokker-Planck equation for the joint orientation and angular momentum probability distribution can be solved approximately using an `ansatz' Gaussian distribution in exponential coordinates.

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