Iso-curvature fluctuations through axion trapping by cosmic string wakes

Details Iso-curvature fluctuations through axion trapping by cosmic string wakes Iso-curvature fluctuations through axion trapping by cosmic string wakes

2005-03-07

arxiv.org/abs/hep-ph/0503057v1

Phys.Rev. D71 (2005) 063527

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 4 figures, RevTex

Scientific paper

10.1103/PhysRevD.71.063527

We consider wake-like density fluctuations produced by cosmic strings at the quark-hadron transition in the early universe. We show that low momentum axions which are produced through the radiation from the axionic string at an earlier stage, may get trapped inside these wakes due to delayed hadronization in these overdense regions. As the interfaces, bordering the wakes, collapse, the axions pick-up momentum from the walls and finally leave the wake regions. These axions thus can produce large scale iso-curvature fluctuations. We have calculated the detailed profile of these axionic density fluctuations and discuss its astrophysical consequences.

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