Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/01/041
Keywords
ation; primordial gravitational waves (theory); cosmological perturbation theory
Funding
- DOE at the University of Minnesota [DE-SC0011842]
- NSF [PHY-1205986, PHY-1520292]
- JSPS Research [27-10917]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Grants-in-Aid for Scientific Research [15J10917] Funding Source: KAKEN
- Division Of Physics
- Direct For Mathematical & Physical Scien [1520292] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205986] Funding Source: National Science Foundation
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We consider a model in which a pseudo-scalar field sigma rolls for some e-folds during inflation, sourcing one helicity of a gauge field. These fields are only gravitationally coupled to the inflaton, and therefore produce scalar and tensor primordial perturbations only through gravitational interactions. These sourced signals are localized on modes that exit the horizon while the roll of sigma is significant. We focus our study on cases in which the model can simultaneously produce (i) a large gravitational wave signal, resulting in observable B-modes of the CMB polarizations, and (ii) sufficiently small scalar perturbations, so to be in agreement with the current limits from temperature anisotropies. Different choices of parameters can instead lead to a localized and visible departure from gaussianity in the scalar sector, either at CMB or LSS scales.
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