The Structure of Cosmic String Wakes (Proceedings)

Details The Structure of Cosmic String Wakes (Proceedings) The Structure of Cosmic String Wakes (Proceedings)

1997-04-15

arxiv.org/abs/astro-ph/9704145v1

Astronomy and Astrophysics

Astrophysics

Proceedings for 18th Texas Symposium on Relativistic Astrophysics, Latex, 3 pages

Scientific paper

We present results of a cosmological hydrodynamical study of gravitational accretion in cosmic string wakes and filaments. Cosmic string wakes are formed by fast moving (v ~ c) strings. A conical deficit angle in the string spacetime induces a velocity perturbation in the background matter and a two-dimensional wake accretes in the path of the string. Filaments are formed by slow moving strings with a large amount of small scale structure. The major gravitational perturbation from slow moving strings is due to the Newtonian field induced by the effective mass of the wiggles. In cosmic string wakes, cool streams of baryons collide and are trapped at the center of the wake causing an enhancement of baryons versus dark matter by a factor of 2.4. In filaments, a high pressure is induced at the filament core and baryonic matter is expelled leading to a baryon deficit in the center of the filament.

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