We comprehensively explore the quadratic curvaton models in the chaotic inflation. In the light of the BICEP2 result r 0.2, all model parameters and relevant observables are computed. It is found the curvaton field value is constrained into a narrow range, σ∗ = (10-2-10-1) and the running of the spectral index is ns′-10-3. We show that if the curvaton is added, the models are heavily degenerated on the ns - r plane. However, introducing a new plane, the degeneracy can be resolved. To distinguish the curvaton models, precise measurements of not only r but also ns′ and the tensor tilt nT are required.
- cosmological perturbation theory
- cosmology of theories beyond the SM
ASJC Scopus subject areas
- Astronomy and Astrophysics