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Critical geometry of a thermal big bang

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Title: Critical geometry of a thermal big bang
Authors: Afshordi, N
Magueijo, J
Item Type: Journal Article
Abstract: We explore the space of scalar-tensor theories containing two nonconformal metrics, and find a discontinuity pointing to a “critical” cosmological solution. Due to the different maximal speeds of propagation for matter and gravity, the cosmological fluctuations start off inside the horizon even without inflation, and will more naturally have a thermal origin (since there is never vacuum domination). The critical model makes an unambiguous, nontuned prediction for the spectral index of the scalar fluctuations: n S = 0.96478 ( 64 ) . Considering also that no gravitational waves are produced, we have unveiled the most predictive model on offer. The model has a simple geometrical interpretation as a probe 3-brane embedded in an E AdS 2 × E 3 geometry.
Issue Date: 18-Nov-2016
Date of Acceptance: 10-Mar-2016
URI: http://hdl.handle.net/10044/1/54735
DOI: https://dx.doi.org/10.1103/PhysRevD.94.101301
ISSN: 1550-2368
Publisher: American Physical Society
Journal / Book Title: Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume: 94
Issue: 10
Copyright Statement: © 2016 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
INFLATIONARY UNIVERSE
FLATNESS
HORIZON
Publication Status: Published
Open Access location: http://arxiv.org/pdf/1603.03312.pdf
Article Number: 101301
Appears in Collections:Physics
Theoretical Physics



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