Large-Scale Peculiar Velocity Field Due to Infinitely Long Cosmic Strings

Details Large-Scale Peculiar Velocity Field Due to Infinitely Long Cosmic Strings Large-Scale Peculiar Velocity Field Due to Infinitely Long Cosmic Strings

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..445h&link_type=abstract

Astrophysical Journal v.415, p.445

Astronomy and Astrophysics

Astronomy

9

Cosmology: Theory, Cosmology: Dark Matter, Cosmic Strings, Galaxies: Distances And Redshifts, Cosmology: Large-Scale Structure Of Universe

Scientific paper

We investigate the large-scale peculiar velocity field of dark matter due to the wakes formed by infinitely long cosmic strings. The peculiar velocity due to such strings, which passed through at the stage 1 + ζi is solved analytically for one-dimensional case, including the contribution of the background radiation density. The three dimensional large-scale peculiar velocities will be the vector sum of such velocities, and the root mean square (rms) peculiar velocities can be estimated. The large peculiar velocity of the Local Group (≃600 km s-1) and the distribution of peculiar velocities for nearby 20 clusters of galaxies can be explained by adopting the parameter Gμβγ(n)1/2 (4 ± 1) × 10-6, where μ and β are the line density and the velocity of a cosmic string in units of c = 1 and γ = (1 - β2)-1/2. The parameter n denotes the number of infinitely long cosmic strings per horizon passed through in each e-time expansion of the universe.

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