Present limits to cosmic bubbles from the COBE-DMR three-point correlation function |
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| Authors: | P S Corasaniti L Amendola F Occhionero |
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| Institution: | Osservatorio Astronomico di Roma, Viale del Parco Mellini 84, 00136 Roma, Italy; Centre for Theoretical Physics, University of Sussex, Falmer, Brighton BN1 9QJ |
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| Abstract: | The existence of large-scale voids in several galaxy surveys suggests the occurrence of an inflationary first-order phase transition. This process generates primordial bubbles that, before evolving into the present voids, leave at decoupling a non-Gaussian imprint on the cosmic microwave background.
In this paper we evaluate an analytical expression of the collapsed three-point correlation function from the bubble temperature fluctuations. Comparing the results with COBE -DMR measures, we obtain upper limits on the allowed non-Gaussianity and hence on the bubble parameters. |
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| Keywords: | cosmic microwave background |
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