Constraints on Topological Defects Energy Density from First-Year WMAP Results

2005/03/17 by Aurélien A. Fraisse, Fraisse, Aurélien A. · 2 citations
Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Particle physics theoretical and experimental studies #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0503402

8 pages, 2 figures, final version

openalex publication_date 2005/03/17 · arxiv created 2006/03/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We compare the predictions of hybrid inflationary models that produce both adiabatic fluctuations and topological defects to first year WMAP results. We use a Markov Chain Monte Carlo method to constrain the contribution of cosmic strings and textures to the CMB angular power spectrum. Marginalizing this contribution over the cosmological parameters of a power law flat LCDM model, we place a 95% upper limit of 23% on the topological defects contribution to density fluctuations, the maximum likelihood being of order 4%. This corresponds to an upper limit on the string scale of Gμ≤ 3.2 × 10^-7. We also explore the degeneracies between the defects contribution and other cosmological parameters.

Cited by

• Cosmic Strings and Weak Gravitational Lensing
• PhD Thesis: String theory in the early universe

Related

• Cosmological Strucure Formation with Topological Defects
• Cosmic Microwave Background Anisotropies: Inflation versus Topological\n Defects
• Topological Defect Models of Structure Formation After the COBE Discovery of CMB Anisotropies
• Coherence Constraint on the Existence of Cosmic Defects
• Signatures of Topological Defects in the Microwave Sky: An Introduction