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- W2155118973 abstract "The Universe may harbor relics of the post-inflationary epoch in the form of a network of self-ordered scalar fields. Such fossils, while consistent with current cosmological data at trace levels, may leave too weak an imprint on the cosmic microwave background and the large-scale distribution of matter to allow for direct detection. The non-Gaussian statistics of the density perturbations induced by these fields, however, permit a direct means to probe for these relics. Here we calculate the bispectrum that arises in models of self-ordered scalar fields. We find a compact analytic expression for the bispectrum, evaluate it numerically, and provide a simple approximation that may be useful for data analysis. The bispectrum is largest for triangles that are aligned (have edges ${k}_{1}ensuremath{simeq}2{k}_{2}ensuremath{simeq}2{k}_{3}$) as opposed to the local-model bispectrum, which peaks for squeezed triangles (${k}_{1}ensuremath{simeq}{k}_{2}ensuremath{gg}{k}_{3}$), and the equilateral bispectrum, which peaks at ${k}_{1}ensuremath{simeq}{k}_{2}ensuremath{simeq}{k}_{3}$. We estimate that this non-Gaussianity should be detectable by the Planck satellite if the contribution from self-ordering scalar fields to primordial perturbations is near the current upper limit." @default.
- W2155118973 created "2016-06-24" @default.
- W2155118973 creator A5011447076 @default.
- W2155118973 creator A5012622994 @default.
- W2155118973 creator A5086110340 @default.
- W2155118973 date "2010-06-04" @default.
- W2155118973 modified "2023-10-06" @default.
- W2155118973 title "Non-Gaussianity from self-ordering scalar fields" @default.
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