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  Modified dispersion relations, inflation, and scale invariance

Bianco, S., Friedhoff, N., & Wilson-Ewing, E. (2018). Modified dispersion relations, inflation, and scale invariance. Physical Review D, 97: 046006. doi:10.1103/PhysRevD.97.046006.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-838D-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E871-9
Genre: Journal Article

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 Creators:
Bianco, Stefano1, Author              
Friedhoff, Nicolai1, Author              
Wilson-Ewing, Edward1, Author              
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24014              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: For a certain type of modified dispersion relations, the vacuum quantum state for very short wavelength cosmological perturbations is scale-invariant and it has been suggested that this may be the source of the scale-invariance observed in the temperature anisotropies in the cosmic microwave background. We point out that for this scenario to be possible, it is necessary to red-shift these short wavelength modes to cosmological scales in such a way that the scale-invariance is not lost. This can be done by inflation with a sufficiently large Hubble rate, without any requirement for slow roll. We also show that in the case of slow-roll inflation, modes that start in their vacuum quantum state will become nearly scale-invariant when they exit the Hubble radius for any power law modified dispersion relation.

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 Dates: 2016-09-222018
 Publication Status: Published in print
 Pages: 8 pages
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1609.06891
URI: http://arxiv.org/abs/1609.06891
DOI: 10.1103/PhysRevD.97.046006
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 97 Sequence Number: 046006 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258