Liberating the Inflaton from Primordial Spectrum Constraints
arXiv:astro-ph/0310512 · doi:10.1088/1475-7516/2004/03/009
Abstract
I discuss a mechanism that renders the spectral index of the primordial spectrum and the inflationary stage independent of each other. If a scalar field acquires an appropriate time-dependent mass, it is possible to generate an adiabatic, Gaussian scale invariant spectrum of density perturbations during any stage of inflation. As an illustration, I present a simple model where the time-dependent mass arises from the coupling of the inflaton to a second scalar. The mechanism I propose might help to implement a successful inflationary scenario in particle physics theories that do not yield slow-roll potentials.
7 two-column pages, 1 figure. Uses RevTeX4
References in corpus (4)
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
- Challenges in generating density perturbations from a fluctuating inflaton coupling
- Evolution of primordial perturbations and a fluctuating decay rate
- Large-scale curvature perturbations with spatial and time variations of the inflaton decay rate