Planck 2013 results. XXV. Searches for cosmic strings and other topological defects - INSPIRE

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Planck 2013 results. XXV. Searches for cosmic strings and other topological defects

Planck

Collaboration

Mar 20, 2013

21 pages

Published in:

Astron.Astrophys. 571 (2014) A25

Published: Oct 29, 2014

e-Print:

1303.5085 [astro-ph.CO]

DOI:

10.1051/0004-6361/201321621

Report number:

CERN-PH-TH-2013-138

Experiments:

PLANCK

View in:

reference search393 citations

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Abstract: (arXiv)

Planck data have been used to provide stringent new constraints on cosmic strings and other defects. We describe forecasts of the CMB power spectrum induced by cosmic strings, calculating these from network models and simulations using line-of-sight Boltzmann solvers. We have studied Nambu-Goto cosmic strings, as well as field theory strings for which radiative effects are important, thus spanning the range of theoretical uncertainty in strings models. We have added the angular power spectrum from strings to that for a simple adiabatic model, with the extra fraction defined as

f_{10}

at multipole

\ell=10

. This parameter has been added to the standard six parameter fit using COSMOMC with flat priors. For the Nambu-Goto string model, we have obtained a constraint on the string tension of

G\mu/c^2 < 1.5 x 10^{-7}

and

f_{10} < 0.015

at 95% confidence that can be improved to

G\mu/c^2 < 1.3 x 10^{-7}

and

f_{10} < 0.010

on inclusion of high-

\ell

CMB data. For the abelian-Higgs field theory model we find,

G\mu_{AH}/c^2 < 3.2 x 10^{-7}

and

f_{10} < 0.028

. The marginalized likelihoods for

f_{10}

and in the

f_{10}

--

\Omega_b h^2

plane are also presented. We have also obtained constraints on

f_{10}

for models with semi-local strings and global textures for which

G\mu/c^2 < 1.1 x 10^{-6}

. We have made complementarity searches for the specific non-Gaussian signatures of cosmic strings, calibrating with all-sky Planck resolution CMB maps generated from networks of post-recombination strings. We have obtained upper limits on the string tension at 95% confidence of

G\mu/c^2 < 8.8 x 10^{-7}

using modal bispectrum estimation and

G\mu/c^2 < 7.8 x 10^{-7}

for real space searches with Minkowski functionals. These are conservative upper bounds because only post-recombination string contributions have been included in the non-Gaussian analysis.

Note:

20 pages, 15 figures

Astroparticle physics
cosmology: cosmic background radiation
cosmology: observations
cosmology: theory
cosmology: early Universe
cosmic background radiation
cosmological parameters
early Universe
large-scale structure of Universe
cosmic background radiation: power spectrum

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