Constraints on a scale invariant power spectrum from superinflation in loop quantum cosmology

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.74.083507· OSTI ID:20871377

Mulryne, David J ^[1]; Nunes, Nelson J ^[2]

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1. School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS (United Kingdom)
2. School of Physics and Astronomy, University of Minnesota, 116 Church Street S.E., Minneapolis, Minnesota 55455 (United States)

The computation of the spectrum of primordial perturbations, generated by a scalar field during the superinflationary 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.

• OSTI ID: 20871377
• Journal Information: Physical Review. D, Particles Fields, Vol. 74, Issue 8; Other Information: DOI: 10.1103/PhysRevD.74.083507; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
COSMOLOGY
DISTURBANCES
ENERGY SPECTRA
MATHEMATICAL SOLUTIONS
POTENTIAL ENERGY
POTENTIALS
QUANTUM FIELD THEORY
SCALAR FIELDS
SCALE INVARIANCE