2016
DOI: 10.48550/arxiv.1605.05981
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Long velocity tails in plasmas and gravitational systems

L. Brenig,
Y. Chaffi,
T. M. Rocha Filho

Abstract: Long tails in the velocity distribution are observed in plasmas and gravitational systems. Some experiments and observations in far-from-equilibrium conditions show that these tails behave as 1/v 5/2 . We show here that such heavy tails are due to a universal mechanism related to the fluctuations of the total force field. Owing to the divergence in 1/r 2 of the binary interaction force, these fluctuations can be very large and their probability density exhibits a similar long tail. They induce large velocity f… Show more

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“…[48] Therefore, a microscopic description involving actual particles, rather than a continuum represented by a smooth distribution function in (r, v) space, is their physical fundamental model [18,19]. As deriving a kinetic model for singular interactions, with the Coulomb divergence at short range, remains a challenge [5,11,30], understanding basic plasma phenomena from the N -body picture is important. Moreover, the N -body approach yields its own benefits, such as showing unexpected connections between Landau damping and Debye screening [21].…”
Section: Introductionmentioning
confidence: 99%
“…[48] Therefore, a microscopic description involving actual particles, rather than a continuum represented by a smooth distribution function in (r, v) space, is their physical fundamental model [18,19]. As deriving a kinetic model for singular interactions, with the Coulomb divergence at short range, remains a challenge [5,11,30], understanding basic plasma phenomena from the N -body picture is important. Moreover, the N -body approach yields its own benefits, such as showing unexpected connections between Landau damping and Debye screening [21].…”
Section: Introductionmentioning
confidence: 99%