On degenerate models of cosmic inflation
- Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Am Mühlenberg 1, D-14476 Potsdam (Germany)
- Physics Department, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago (Chile)
- Department of Physics, King's College London, Strand, London WC2R 2LS (United Kingdom)
- Asia Pacific Center for Theoretical Physics (APCTP), Pohang 790-784 (Korea, Republic of)
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 Λ{sub UV}. Specifically, we show how the f{sub NL} non-linearity parameters are related to the phase velocity of curvature perturbations at horizon exit, which is parameterized by Λ{sub UV}. BICEP2 and PLANCK findings are shown to be consistent with a value Λ{sub UV} ∼ Λ{sub 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.
- OSTI ID:
- 22375849
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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