Adiabatic fluctuations from cosmic strings in a contracting universe

Details Adiabatic fluctuations from cosmic strings in a contracting universe Adiabatic fluctuations from cosmic strings in a contracting universe

2008-08-08

arxiv.org/abs/0808.1285v2

JCAP 0907:015,2009

Astronomy and Astrophysics

Astrophysics

8 pages, to appear in JCAP

Scientific paper

10.1088/1475-7516/2009/07/015

We show that adiabatic, super-Hubble, and almost scale invariant density fluctuations are produced by cosmic strings in a contracting universe. An essential point is that isocurvature perturbations produced by topological defects such as cosmic strings on super-Hubble scales lead to a source term which seeds the growth of curvature fluctuations on these scales. Once the symmetry has been restored at high temperatures, the isocurvature seeds disappear, and the fluctuations evolve as adiabatic ones in the expanding phase. Thus, cosmic strings may be resurrected as a mechanism for generating the primordial density fluctuations observed today.

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