Observational constraints on cosmic strings: Bayesian analysis in a three dimensional parameter space

Details Observational constraints on cosmic strings: Bayesian analysis in a three dimensional parameter space Observational constraints on cosmic strings: Bayesian analysis in a three dimensional parameter space

2004-03-10

arxiv.org/abs/astro-ph/0403268v3

JCAP 0409:008,2004

Astronomy and Astrophysics

Astrophysics

v3: 4 pages, 5 figures, slight modifications to match published version

Scientific paper

10.1088/1475-7516/2004/09/008

Current data exclude cosmic strings as the primary source of primordial density fluctuations. However, in a wide class of inflationary models, strings can form at later stages of inflation and have potentially detectable observational signatures. We study the constraints from WMAP and SDSS data on the fraction of primordial fluctuations sourced by local cosmic strings. The Bayesian analysis presented in this brief report is restricted to the minimal number of parameters. Yet it is useful for two reasons. It confirms the results of Pogosian et al (2003) using an alternative statistical method. Secondly, it justifies the more costly multi-parameter analysis. Already, varying only three parameters -- the spectral index and the amplitudes of the adiabatic and string contributions -- we find that the upper bound on the cosmic string contribution is of order 10%. We expect that the full multi-parameter study, currently underway, will likely loosen this bound.

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