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CMB constraints on cosmic strings and superstrings

Charnock, Tom; Avgoustidis, Anastasios; Copeland, Edmund J.; Moss, Adam

Authors

Tom Charnock tom.charnock@nottingham.ac.uk

Anastasios Avgoustidis anastasios.avgoustidis@nottingham.ac.uk

Edmund J. Copeland ed.copeland@nottingham.ac.uk

Adam Moss adam.moss@nottingham.ac.uk



Abstract

We present the first complete MCMC analysis of cosmological models with evolving cosmic (super)string networks, using the Unconnected Segment Model in the unequal-time correlator formalism. For ordinary cosmic string networks, we derive joint constraints on ΛCDM and string network parameters, namely the string tension Gμ, the loop-chopping efficiency cr and the string wiggliness α. For cosmic superstrings, we obtain joint constraints on the fundamental string tension GμF, the string coupling gs, the self-interaction coefficient cs, and the volume of compact extra dimensions w. This constitutes the most comprehensive CMB analysis of ΛCDM cosmology + strings to date. For ordinary cosmic string networks our updated constraint on the string tension, obtained using Planck2015 temperature and polarisation data, is Gμ < 1.1 × 10^(−7) in relativistic units, while for cosmic superstrings our constraint on the fundamental string tension after marginalising over gs, cs and w is GμF < 2.8 × 10^(−8).

Journal Article Type Article
Publication Date Jun 1, 2016
Journal Physical Review D
Print ISSN 1550-7998
Electronic ISSN 1550-2368
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 93
Issue 12
Article Number 123503
APA6 Citation Charnock, T., Avgoustidis, A., Copeland, E. J., & Moss, A. (2016). CMB constraints on cosmic strings and superstrings. Physical Review D - Particles, Fields, Gravitation and Cosmology, 93(12), https://doi.org/10.1103/PhysRevD.93.123503
DOI https://doi.org/10.1103/PhysRevD.93.123503
Publisher URL http://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.123503
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Selected article by PRD journal as Editor's Choice

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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