Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2013/09/009
Keywords
primordial magnetic fields; inflation; non-gaussianity
Funding
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- [248160]
- [242775]
- Grants-in-Aid for Scientific Research [12J08160] Funding Source: KAKEN
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We compute the power spectrum P-zeta and non-linear parameters f(NL) and tau(NL) of the curvature perturbation induced during inflation by the electromagnetic fields in the kinetic coupling model (IFF model). By using the observational result of P-zeta, f(NL) and tau(NL) reported by the Planck collaboration, we study the constraint on the model comprehensively. Interestingly, if the single slow-rolling inflaton is responsible for the observed P-zeta the constraint from tau(NL) is most stringent. We also find a general relationship between f(NL), and tau(NL) generated in this model. Even if f(NL) similar to O(1), a detectable tau(NL) can be produced.
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