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Keywords
(12)
Big Bang Nucleosynthesis
Boundary Condition
calabiyau manifold
Early Universe
Energy Density
Equation of State
Extra Dimension
Field Theory
Large Classes
Satisfiability
Structure Formation
friedmann robertson walker
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Cosmological challenges in theories with extra dimensions and remarks on the horizon problem
Cosmological challenges in theories with extra dimensions and remarks on the horizon problem,10.1103/PhysRevD.61.023511,Physical Review D,Daniel J. H.
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Cosmological challenges in theories with extra dimensions and remarks on the horizon problem
(
Citations: 16
)
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Daniel J. H. Chung
,
Katherine Freese
We consider the cosmology that results if our observable universe is a 3brane in a higher dimensional universe. In particular, we focus on the case where our 3brane is located at the Z2 symmetry fixed plane of a Z2 symmetric fivedimensional spacetime, as in the HoravaWitten model compactified on a CalabiYau manifold. As our first result, we find that there can be substantial modifications to the standard FriedmannRobertsonWalker (FRW) cosmology; as a consequence, a large class of such models is observationally inconsistent. In particular, any relationship between the Hubble constant and the
energy density
on our brane is possible, including (but not only) FRW. Generically, due to the existence of the bulk and the boundary conditions on the orbifold fixed plane, the relationship is not FRW, and hence cosmological constraints coming from
big bang
nucleosynthesis, structure formation, and the age of the universe difficult to satisfy. We do wish to point out, however, that some specific choices for the bulk stressenergy tensor components do reproduce normal FRW cosmology on our brane, and we have constructed an explicit example. As our second result, for a broad class of models, we find a somewhat surprising fact: the stabilization of the radius of the
extra dimension
and hence the four dimensional Planck mass requires unrealistic finetuning of the
equation of state
on our 3brane. In the last third of the paper, we make remarks about causality and the horizon problem that apply to any theory in which the volume of the
extra dimension
determines the fourdimensional gravitational coupling. We point out that some of the assumptions that lead to the usual inflationary requirements are modified.
Journal:
Physical Review D  PHYS REV D
, vol. 61, no. 2, pp. 23511023511, 2000
DOI:
10.1103/PhysRevD.61.023511
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Citation Context
(7)
...Details regarding cosmological evolution were worked out in the initial series of papers [14, 15, 16,
17
, 18, 19], where it was shown that there are deviations from the standard cosmology at temperatures above a particular normalcy temperature...
Damien P. George
,
et al.
Extradimensional cosmology with domainwall branes
...However, motivated by brane world cosmology (
Chung & Freese 2000
), the Friedmann equation is modified by the presence of an additional energy term that is proportional to the cold dark matter density raised to a general power, i.e...
Stephane Fay
,
et al.
Largescale structure and the Cardassian fluid
...A number of bouncing braneworld scenarios have also been developed [
18
, 19, 20, 21, 22]...
James E. Lidsey
.
Early universe dynamics in semiclassical loop quantum cosmology
...The appearance of the extra term on the right hand side was originally motivated by brane cosmology [
22
]...
...This approach was, however criticized in [23] where it was shown that in the scenario of [
22
], the weak energy condition was violated on the brane...
Morad Amarzguioui
,
et al.
Combined constraints on Cardassian models from supernovae, CMB and lar...
...It has been argued that in many cases Poincar´e invariance should be violated in the bulk [
15
, 16, 17, 18, 19, 20, 21] giving rise to an anomalous dispersion relation for gravitational waves.2 No Lorentz violation would show up...
Guy D. Moore
,
et al.
Lower bound on the propagation speed of gravity from gravitational Che...
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Sort by:
Citations
(16)
Extradimensional cosmology with domainwall branes
(
Citations: 1
)
Damien P. George
,
Mark Trodden
,
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(
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Published in 2007.
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(
Citations: 2
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Stephane Fay
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Astronomy & Astrophysics  ASTRON ASTROPHYS
, vol. 460, no. 1, pp. 3744, 2006
Sterileactive neutrino oscillations and shortcuts in the extra dimension
(
Citations: 7
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Heinrich Paes
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, vol. 72, no. 9, pp. 95017095017, 2005