Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2013/01/031
Keywords
cosmological perturbation theory; inflation; non-gaussianity
Funding
- Lancaster-Manchester-Sheffield Consortium for Fundamental Physics under STFC [ST/J00418/1]
- European Research and Training Network (RTN) [UNILHC23792]
- MICINN [FIS2010-17395]
- [CPAN CSD2007-00042]
- Science and Technology Facilities Council [ST/G00045X/1, ST/J000418/1] Funding Source: researchfish
- STFC [ST/J000418/1, ST/G00045X/1] Funding Source: UKRI
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We present the first complete calculation of the curvature perturbation generated during the hybrid inflation waterfall, caused by the coupling of the waterfall field to a gauge field A whose kinetic function f(2) depends on the inflaton field. We impose an upper bound on the field W equivalent to f A which ensures that it has a negligible effect before the waterfall. We confirm the claim of Soda and Yokoyama, that the perturbation delta W generates a statistically anisotropic spectrum and bispectrum, which could easily be observable. We also discover a new phenomenon, whereby the time-dependent 'varyon' field W causes the inflaton contribution to vary during the waterfall. The varyon mechanism might be implemented also with a scalar field and might not involve the waterfall.
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