Non-Gaussian Features of Linear Cosmic String Models

Avelino, P. P.; Shellard, E. P. S.; Wu, J. H. P.; Allen, Bruce

doi:10.1086/311686

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Non-Gaussian Features of Linear Cosmic String Models

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Allen, Bruce
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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AstroJ507-L101.pdf
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Citation

Avelino, P. P., Shellard, E. P. S., Wu, J. H. P., & Allen, B. (1998). Non-Gaussian Features of Linear Cosmic String Models. The Astrophysical Journal, 507(2), L101-L104. doi:10.1086/311686.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-5920-B

Abstract

We investigate the non-Gaussian properties of cosmic string-seeded linear density perturbations with cold and hot dark matter backgrounds using high-resolution numerical simulations. We compute the one-point probability density function of the resulting density field and its skewness, kurtosis, and genus curves for different smoothing scales. A semianalytic model is then invoked to provide a physical interpretation of our results. We conclude that on scales smaller than 1.5(Omegah^2)^-1 Mpc, perturbations seeded by cosmic strings are very non-Gaussian. These scales may still be in a linear or mildly nonlinear regime in an open or Lambda universe with Gamma=Omegah<~0.2.