Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..341m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 2, p. 341-342
Astronomy and Astrophysics
Astrophysics
2
Astronomical Models, Big Bang Cosmology, Galactic Evolution, Gas Density, Gravitation Theory, Interstellar Gas, Maxwell-Boltzmann Density Function, Perturbation Theory, Time Dependence, Discontinuity, Inhomogeneity, Mathematical Models, Particle Diffusion, Velocity Distribution, Vlasov Equations
Scientific paper
Classical time-dependent perturbation theory is applied to the Vlassov-Poisson equations describing the one-dimensional gravitational gas. The initial conditions are an initial Maxwellian velocity distribution and a step-function discontinuity. It is shown that on top of the usual free-particle diffusion - smoothing out the initial density discontinuity - a density pulse and a counter-pulse propagate away from the original discontinuity. The results suggest that initial density discontinuities can seed the formation of inhomogenities in the evolution of a collisionless one-dimensional gravitational gas, a result which should be verified in three dimensions, to study the formation of inhomogeneities in galactic dynamics.
Feix Martin
Jirkovsky L.
Muriel Amador
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