Effects of Cosmic Strings on Free Streaming

Details Effects of Cosmic Strings on Free Streaming Effects of Cosmic Strings on Free Streaming

2006-08-10

arxiv.org/abs/hep-ph/0608115v1

Phys.Rev. D74 (2006) 063512

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 9 figures

Scientific paper

10.1103/PhysRevD.74.063512

We study the effect of free streaming in a universe with cosmic strings with time-varying tension as well as with constant tension. Although current cosmological observations suggest that fluctuation seeded by cosmic strings cannot be the primary source of cosmic density fluctuation, some contributions from them are still allowed. Since cosmic strings actively produce isocurvature fluctuation, the damping of small scale structure via free streaming by dark matter particles with large velocity dispersion at the epoch of radiation-matter equality is less efficient than that in models with conventional adiabatic fluctuation. We discuss its implications to the constraints on the properties of particles such as massive neutrinos and warm dark matter.

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