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Cosmological constraints from cosmic homogeneity
Authors
Anne Ealet
Stephanie Escoffier
+3Â more
Adam James Hawken
Pierros Ntelis
Andre Tilquin
Publication date
15 May 2019
Publisher
HAL CCSD
Abstract
In this paper, we study the normalised characteristic scale of transition to cosmic homogeneity,
R
H
/
d
V
\mathcal{R}_H/d_V
R
H
â
/
d
V
â
, as a cosmological probe. We use a compilation of SDSS galaxy samples, comprising more than
1
0
6
10^6
1
0
6
galaxies in the redshift range
0.17
â€
z
â€
2.2
0.17 \leq z \leq 2.2
0.17
â€
z
â€
2.2
within the largest comoving volume to date,
âŒ
8
h
â
3
G
p
c
3
\sim 8 h^{-3}\mathrm{Gpc}^3
âŒ
8
h
â
3
Gpc
3
. We show that these samples can be described by a single bias model as a function of redshift. By combining our measurements with prior Cosmic Microwave Background and Lensing information from the Planck satellite, we constrain the total matter density ratio of the universe,
Ω
m
=
0.363
±
0.025
\Omega_m = 0.363 \pm 0.025
Ω
m
â
=
0.363
±
0.025
, and the Dark Energy density ratio,
Ω
Î
=
0.649
±
0.021
\Omega_{\Lambda} = 0.649 \pm 0.021
Ω
Î
â
=
0.649
±
0.021
, improving the values from Planck alone by 31% and 28%, respectively. Our results are compatible with a flat
Î
\Lambda
Î
CDM model. These results show the complementarity of the normalised homogeneity scale with other cosmological probes and open new roads to cosmometry
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HAL AMU
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