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Cosmic String Wakes and Large-Scale Structure

Published online by Cambridge University Press:  03 August 2017

A. Stebbins
Affiliation:
NASA/Fermilab Astrophysics Center
S. Veeraraghavan
Affiliation:
Astronomy Department, University of California, Berkeley
R. Brandenberger
Affiliation:
Physics Department, Brown University
J. Silk
Affiliation:
Astronomy Department, University of California, Berkeley
N. Turok
Affiliation:
NASA/Fermilab Astrophysics Center

Extract

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Cosmic Strings are one-dimensional topological defects that may be formed in the early universe during a phase transition, and which may be the source of all inhomogeneities in our universe. Their mass per unit length, μ, gives us a dimensionless parameter, μ6 ≡ 106/c2, which must be of order unity for strings to seed galaxy formation. Results to date from the ongoing CfA redshift survey suggest that galaxies are distributed on two-dimensional surfaces, whose typical separation is about 50h50−1 Mpc. The loop distribution is unlikely to imprint such large-scale patterns in the galaxy positions so we have examined whether this structure could be caused by infinite strings. Because an infinite string typically moves at a substantial fraction of the speed of light, it will leave behind a very large accretion wake in the ambient medium. Gravitational instablity causes these wakes to continue to accrete matter long after the string has moved elsewhere. These wakes form around the two-dimensional surfaces swept out by the long strings.

Type
Appendix 1: Poster Papers
Copyright
Copyright © Reidel 1988 

References

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