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Primordial perturbations in a rainbow universe with running Newton constant

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Title: Primordial perturbations in a rainbow universe with running Newton constant
Authors: Brighenti, F
Gubitosi, G
Magueijo, J
Item Type: Journal Article
Abstract: e compute the spectral index of primordial perturbations in a rainbow universe. We allow the Newton constant G to run at (super-) Planckian energies and we consider both vacuum and thermal perturbations. If the rainbow metric is the one associated to a generalized Horava-Lifshitz dispersion relation, we find that only when G tends asymptotically to 0 can one match the observed value of the spectral index and solve the horizon problem, both for vacuum and thermal perturbations. For vacuum fluctuations the observational constraints imply that the primordial universe expansion can be both accelerating or decelerating, while in the case of thermal perturbations only decelerating expansion is allowed.
Issue Date: 31-Mar-2017
Date of Acceptance: 1-Mar-2017
URI: http://hdl.handle.net/10044/1/54233
DOI: https://dx.doi.org/10.1103/PhysRevD.95.063534
ISSN: 2470-0010
Publisher: American Physical Society
Journal / Book Title: Physical Review D
Volume: 95
Issue: 6
Copyright Statement: © 2017 American Physical Society
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
John Templeton Foundation
Funder's Grant Number: ST/G000743/1
ST/J000353/1
ST/L00044X/1
ID#47633
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
GRAVITY
gr-qc
astro-ph.CO
hep-th
Publication Status: Published
Article Number: ARTN 063534
Appears in Collections:Physics
Theoretical Physics
Faculty of Natural Sciences



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