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.
arXiv comment(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 (28)
- Planck 2013 results. XVI. Cosmological parameters
- Particle Physics Models of Inflation and the Cosmological Density Perturbation
- BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
- Planck 2013 results. XXII. Constraints on inflation
- A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
- Features of heavy physics in the CMB power spectrum
- Toward an Understanding of Foreground Emission in the BICEP2 Region
- The Gelaton Scenario: Equilateral non-Gaussianity from multi-field dynamics
- Effective theories of single field inflation when heavy fields matter
- 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
- The Spectrum of Density Perturbations produced during Inflation to Leading Order in a General Slow-Roll Approximation
- A covariant approach to general field space metric in multi-field inflation
- The spectrum of cosmological perturbations produced by a multi-component inflaton to second order in the slow-roll approximation
- Whipped inflation
- The Power Spectrum for a Multi-Component Inflaton to Second-Order Corrections in the Slow-Roll Expansion
- Conformal invariance of curvature perturbation
- The inflationary bispectrum with curved field-space
- Decoupling Survives Inflation: A Critical Look at Effective Field Theory Violations During Inflation
- Inflation and dark matter in two Higgs doublet models
- Ruling out the power-law form of the scalar primordial spectrum
- Conservation of the nonlinear curvature perturbation in generic single-field inflation
- General formula for the running of local fNL
- Large non-Gaussianity in non-minimal inflation
- Cosmological observables in multi-field inflation with a non-flat field space
- Bayesian evidence of non-standard inflation: isocurvature perturbations and running spectral index
- Tensors, BICEP2, prior dependence, and dust