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Non-Gaussian Signatures from the Post-inflationary Early Universe

Nov, 2008
4 pages
Published in:
  • Phys.Rev.Lett. 103 (2009) 251301
e-Print:
DOI:
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Abstract: (arXiv)
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.
  • 98.70.Vc
  • 98.80.Cq
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