Non-Gaussianities and chiral gravitational waves in natural steep inflation

By M. Anber, L. Sorbo. 2012

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In arXiv:0908.4089, we have proposed a model where natural inflation is realized on a steep potential as a consequence of the interaction of the inflaton with gauge fields through an axion-like coupling. In the present work we study the nongaussianities and the spectrum of tensor modes generated in this scenario. The nongaussianities turn out to be compatible with current observations and can be large enough to be detectable by Planck. The non-observation of tensor modes imposes new constraints on the parameter space of the system that are about one order of magnitude stronger than those found in our previous work. More importantly, in certain regions of the parameter space tensor modes might be detected by upcoming Cosmic Microwave Background experiments even if inflation occurs at energies as low as the TeV scale. In this case the tensor modes would be chiral, and would lead to distinctive parity-violating correlation functions in the CMB.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Oceanography

View Paper: https://www.semanticscholar.org/paper/92a4bfcdbbc3f0a756e60420053c246ca7d8fb9a

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Citations in the corpus

Reconstructing the spectral shape of a stochastic gravitational wave background with LISA (2019, background): “[6–29]), to models that break space-time symmetries during inflation, leading to a blue spectrum for primordial tensor modes (see e.”
A review of axion inflation in the era of Planck (2013, background): “A large value N = O(105) is assumed in [48, 50] to match the observed amplitude of the primordial perturbations.”
Primordial gravitational waves for universality classes of pseudoscalar inflation (2016, methodology): “The resulting GW spectrum was analyzed in [9], with the backreaction of the gauge fields on the inflationary dynamics considered in [6–8].”
Perturbations in Chromo-Natural Inflation (2013, background): “, [10, 59] to model the strong coupling regime of non-Abelian gauge theory.”
Gauge fields and inflation (2012, background): “This will cause a birefringent (chiral) gravity wave production which has its own interesting observational prospects [77, 79, 82, 83].”