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Non-Gaussian Signatures from the Postinflationary Early Universe

We consider contributions to non-Gaussianity of the Cosmic Microwave Background (CMB) from remnants of post-inflationary phase transitions in the very early universe. Such signatures can optimistically be used to discover evidence of new particle physics through cosmological observations. More conservatively they provide a potential obstacle to extracting information about the non-Gaussian nature of primordial density fluctuations from any detection in the CMB. We demonstrate this explicitly by computing the bispectrum from global textures, which may be generated from a wide class of particle physics models.

preprint2009arXivOpen access
Alessandra SilvestriMark Trodden
astro-phhep-ph
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Alessandra SilvestriMark Trodden

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