Influence of structure formation on the cosmic expansion

被引:57
作者
Clarkson, Chris [1 ]
Ananda, Kishore [1 ]
Larena, Julien [1 ]
机构
[1] Univ Cape Town, Dept Math & Appl Math, Cosmol & Grav Grp, ZA-7701 Cape Town, South Africa
来源
PHYSICAL REVIEW D | 2009年 / 80卷 / 08期
关键词
DARK ENERGY; INHOMOGENEOUS FLUIDS; GENERAL-RELATIVITY; AVERAGE PROPERTIES; COSMOLOGIES; HOMOGENEITY; FIELD;
D O I
10.1103/PhysRevD.80.083525
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the effect that the average backreaction of structure formation has on the dynamics of the cosmological expansion, within the concordance model. Our approach in the Poisson gauge is fully consistent up to second order in a perturbative expansion about a flat Friedmann background, including a cosmological constant. We discuss the key length scales which are inherent in any averaging procedure of this kind. We identify an intrinsic homogeneity scale that arises from the averaging procedure, beyond which a residual offset remains in the expansion rate and deceleration parameter. In the case of the deceleration parameter, this can lead to a quite large increase in the value, and may therefore have important ramifications for dark energy measurements, even if the underlying nature of dark energy is a cosmological constant. We give the intrinsic variance that affects the value of the effective Hubble rate and deceleration parameter. These considerations serve to add extra intrinsic errors to our determination of the cosmological parameters, and, in particular, may render attempts to measure the Hubble constant to percent precision overly optimistic.
引用
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页数:18
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共 52 条
[1]   Cosmological gravitational wave background from primordial density perturbations [J].
Ananda, Kishore N. ;
Clarkson, Chris ;
Wands, David .
PHYSICAL REVIEW D, 2007, 75 (12)
[2]   The full second-order radiation transfer function for large-scale CMB anisotropies [J].
Bartolo, Nicola ;
Matarrese, Sabino ;
Riotto, Antonio .
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2006, (05)
[3]   Gravitational wave spectrum induced by primordial scalar perturbations [J].
Baumann, Daniel ;
Steinhardt, Paul ;
Takahashi, Keitaro ;
Ichiki, Kiyotomo .
PHYSICAL REVIEW D, 2007, 76 (08)
[4]   Cosmological backreaction from perturbations [J].
Behrend, Juliane ;
Brown, Iain A. ;
Robbers, Georg .
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2008, (01)
[5]   Averaging Robertson-Walker cosmologies [J].
Brown, Iain A. ;
Robbers, Georg ;
Behrend, Juliane .
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2009, (04)
[6]   On globally static and stationary cosmologies with or without a cosmological constant and the dark energy problem [J].
Buchert, T .
CLASSICAL AND QUANTUM GRAVITY, 2006, 23 (03) :817-844
[7]   Regional averaging and scaling in relativistic cosmology [J].
Buchert, T ;
Carfora, M .
CLASSICAL AND QUANTUM GRAVITY, 2002, 19 (23) :6109-6145
[8]   On average properties of inhomogeneous fluids in general relativity: Dust cosmologies [J].
Buchert, T .
GENERAL RELATIVITY AND GRAVITATION, 2000, 32 (01) :105-125
[9]   On average properties of inhomogeneous fluids in general relativity: Perfect fluid cosmologies [J].
Buchert, T .
GENERAL RELATIVITY AND GRAVITATION, 2001, 33 (08) :1381-1405
[10]   Dark Energy from structure: a status report [J].
Buchert, Thomas .
GENERAL RELATIVITY AND GRAVITATION, 2008, 40 (2-3) :467-527