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Journal Article

On degenerate models of cosmic inflation


Gwyn,  Rhiannon
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE;

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Gwyn, R., Palma, G. A., Sakellariadou, M., & Sypsas, S. (2014). On degenerate models of cosmic inflation. Journal of Cosmology and Astroparticle Physics, 10: 005. doi:10.1088/1475-7516/2014/10/005.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-755F-8
In this article we discuss the role of current and future CMB measurements in pinning down the model of inflation responsible for the generation of primordial curvature perturbations. By considering a parameterization of the effective field theory of inflation with a modified dispersion relation arising from heavy fields, we derive the dependence of cosmological observables on the scale of heavy physics $\Lambda_{\rm UV}$. Specifically, we show how the $f_{\rm NL}$ non-linearity parameters are related to the phase velocity of curvature perturbations at horizon exit, which is parameterized by $\Lambda_{\rm UV}$. Bicep2 and Planck findings are shown to be consistent with a value $\Lambda_{\rm UV} \sim \Lambda_{\rm GUT}$. However, we find a degeneracy in the parameter space of inflationary models that can only be resolved with a detailed knowledge of the shape of the non-Gaussian bispectrum.