Running of scalar spectral index in multi-field inflation
arXiv:1409.8151 · doi:10.1088/1475-7516/2015/05/041
Abstract
We compute the running of the scalar spectral index in general multi-field slow-roll inflation. By incorporating explicit momentum dependence at the moment of horizon crossing, we can find the running straightforwardly. At the same time, we can distinguish the contributions from the quasi de Sitter background and the super-horizon evolution of the field fluctuations.
(v1) 7 pages; (v2) 8 pages, 1 figure, discussions expanded especially regarding the initial conditions, to appear in Journal of Cosmology and Astroparticle Physics
References in corpus (6)
- Toward an Understanding of Foreground Emission in the BICEP2 Region
- Mass hierarchies and non-decoupling in multi-scalar field dynamics
- A joint analysis of Planck and BICEP2 B modes including dust polarization uncertainty
- Strongly Coupled Perturbations in Two-Field Inflationary Models
- Whipped inflation
- Conservation of the nonlinear curvature perturbation in generic single-field inflation