Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/10/030
Keywords
non-gaussianity; Cosmic strings; domain walls; monopoles
Funding
- Science and Technology Facilities Council [ST/I000976/1]
- European Research Council under the European Union's Seventh Framework Programme (FP) / ERC [308082]
- BIS National E-infrastructure capital grant [ST/J005673/1]
- STFC [ST/H008586/1, ST/K00333X/1]
- STFC [ST/I000976/1, ST/H008586/1, ST/M007065/1, ST/K00333X/1, ST/L000504/1, ST/J005673/1, ST/L000652/1, ST/M00418X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K00333X/1, ST/L000652/1, ST/M007065/1, ST/I000976/1, ST/H008586/1, ST/M00418X/1, ST/J005673/1, ST/L000504/1] Funding Source: researchfish
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We calculate the cosmic microwave background temperature bispectrum from cosmic strings, including the contributions from the last scattering surface, using a well-established Gaussian model for the string energy-momentum correlation functions, and a simplified model for the cosmic fluid. We check our approximation for the integrated Sachs-Wolfe (ISW) contribution against the bispectrum obtained from the full sky map of the cosmic string ISW signal used by the Planck team, obtaining good agreement. We validate our model for the last scattering surface contribution by comparing the predicted temperature power spectrum with that obtained from a full Boltzmann code treatment applied to the Unconnected Segment Model of a string network. We find that including the last scattering contribution has only a small impact on the upper limit on the string tension resulting from the bispectrum at Planck resolutions, and argue that the bispectrum is unlikely to be competitive with the power spectrum at any resolution.
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