Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-01-16
Phys. Rev. E 77, 051128 (2008)
Physics
Condensed Matter
Statistical Mechanics
19 pages
Scientific paper
10.1103/PhysRevE.77.051128
We develop a theory for fluctuations and correlations in a gas evolving under ballistic annihilation dynamics. Starting from the hierarchy of equations governing the evolution of microscopic densities in phase space, we subsequently restrict to a regime of spatial homogeneity, and obtain explicit predictions for the fluctuations and time correlation of the total number of particles, total linear momentum and total kinetic energy. Cross-correlations between these quantities are worked out as well. These predictions are successfully tested against Molecular Dynamics and Monte-Carlo simulations. This provides strong support for the theoretical approach developed, including the hydrodynamic treatment of the spectrum of the linearized Boltzmann operator. This article is a companion paper to arXiv:0801.2299 and makes use of the spectral analysis reported there.
Barrat Alain
de Soria I. Garcia M.
Maynar P.
Schehr Gregory
Trizac Emmanuel
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