Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/08/036
Keywords
inflation; primordial gravitational waves (theory); gravitational waves and CMBR polarization
Funding
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- MEXT, Japan [24540256, 21111006, 21244033]
- DOE at the University of Minnesota [DE-FG02-94ER-40823]
- DOE at the University of Wisconsin [DE-FG-02-95ER40896]
- Grants-in-Aid for Scientific Research [24540256] Funding Source: KAKEN
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We discuss a mechanism of particle production during inflation that can result in a blue gravitational wave (GW) spectrum, compatible with the BICEP2 result and with the r < 0.11 limit on the tensor-to-scalar ratio at the Planck pivot scale. The mechanism is based on the production of vector quanta from a rolling pseudo-scalar field. Both the vector and the pseudo-scalar are only gravitationally coupled to the inflaton, to keep the production of inflaton quanta at an unobservable level (the overproduction of non-gaussian scalar perturbations is a generic difficulty for mechanisms that aim to generate a visible GW signal from particle production during inflation). This mechanism can produce a detectable amount of GWs for any inflationary energy scale. The produced GWs are chiral and nongaussian; both these aspects can be tested with large-scale polarization data (starting from Planck). We study how to reconstruct the pseudo-scalar potential from the GW spectrum.
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