Constraints on a scale invariant power spectrum from superinflation in LQC

Details Constraints on a scale invariant power spectrum from superinflation in LQC Constraints on a scale invariant power spectrum from superinflation in LQC

2006-07-04

arxiv.org/abs/astro-ph/0607037v2

Phys.Rev. D74 (2006) 083507

Astronomy and Astrophysics

Astrophysics

9 pages. Version accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.74.083507

The computation of the spectrum of primordial perturbations, generated by a scalar field during the super-inflationary phase of Loop Quantum Cosmology, is revisited. The calculation is performed for two different cases. The first considers the dynamics of a massless field and it is found that scale invariance can only be achieved under a severe fine tuning. The second assumes that the field evolves with a constant ratio between kinetic and potential energy, i.e. in a scaling solution. In this case, near scale invariance is a generic feature of the theory if the field rolls in a steep self interaction potential.

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