Critical geometry of a thermal big bang
File(s)
Accepted version
OA Location
Author(s)
Afshordi, Niayesh
Magueijo, Joao
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.
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.
Date Issued
2016-11-18
Date Acceptance
2016-03-10
Citation
Physical Review D - Particles, Fields, Gravitation and Cosmology, 2016, 94 (10)
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
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
John Templeton Foundation
Grant Number
ST/G000743/1
ST/J000353/1
ST/L00044X/1
ID#47633
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
INFLATIONARY UNIVERSE
FLATNESS
HORIZON
Publication Status
Published
Article Number
101301