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CLUSTERING TOMOGRAPHY ON THE FINAL BOSS GALAXY CATALOGUE
MOCK SANTIAGO 2016
Salvador Salazar-Albornoz - April 20th, 2016
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BOSS in a nutshell
Reid
et a
l. (2
015)
• BOSS is part of SDSS-III.
• Observations completed in 2014.
• Total area of 10,200 deg2.
• Positions for 1.2x106 LGs
- LOWZ, with 0.1 < z < 0.43
- CMASS, with 0.43 < z < 0.7
• A sample of 1.6x105 QSO, 2.3 < z < 2.8
CLUSTERING TOMOGRAPHY
TRADITIONAL BAO ANALYSIS
▸ Requires the assumption of a fiducial cosmology to transform RA, DEC, z into physical distances.
▸ Averages the signal over large cosmological volumes, ignoring light-cone effects.
▸ Gives one distance measurement for a large redshift range.
Sánchez et al. (2012)
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CLUSTERING TOMOGRAPHY
ANGULAR CLUSTERING
▸ Cosmology independent measurements.
▸ Requires division in redshift bins (shells), allowing the study of light-cone effects.
▸ Exploits the information of DM & fσ8 redshift evolution.
(see e.g. Crocce et al. 2011a,b; Asorey et al. 2012; Salazar-Albornoz et al. 2014)
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CLUSTERING TOMOGRAPHY
BOSS FORECAST
▸ MCMC test for 3 flat CDM models using synthetic measurements.
▸ Compare performance on cosmological constraints between this approach and BAO, combined with Planck.
▸ Provides improved constraints on time-dependent wDE(a), parametrised as Chevallier & Polanski 2001, Linder 2003.
(Salazar-Albornoz et al. 2014)
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CLUSTERING TOMOGRAPHY
COSMOLOGICAL INFORMATION
▸ Full-shape fits
▸ Redshift evolution of the galaxy bias and RSD parameters included in the modelling.
▸ Analytical description of the full covariance matrix.
!(✓) =
Zdz1�(z1)
Zdz2�(z2)⇠(z1, z2, ✓)
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CLUSTERING TOMOGRAPHY ON BOSS
▸ Binning scheme tailored for BOSS combined sample.
▸ Optimised including cross-correlations between shells.
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(Salazar-Albornoz et al., in perp.)
CLUSTERING TOMOGRAPHY
CLUSTERING TOMOGRAPHY
CLUSTERING TOMOGRAPHY ON BOSS
▸ Study of the linear galaxy bias evolution.
▸ Impact of different assumptions on Cosmological constraints.
(Salazar-Albornoz et al., in perp.)
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PRELIMINARY
0.30 0.33 0.36 0.39⌦m
�1.2
�1.1
�1.0
�0.9
�0.8
wLinearCGCF96
PRELIMINARY
CLUSTERING TOMOGRAPHY
CLUSTERING TOMOGRAPHY ON BOSS
▸ Cosmological constraints on several parameter spaces combining BOSS with CMB and SNIa.
▸ In very good agreement with the standard ΛCDM model
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0.20 0.25 0.30 0.35 0.40⌦m
�1.6
�1.4
�1.2
�1.0
�0.8
w
PlanckPlanck + !(✓)Planck + !(✓) + SNIa
�1.2 �1.1 �1.0 �0.9 �0.8w
0.0
0.3
0.6
0.9
1.2
1.5
�
Planck + !(✓)Planck + !(✓) + SNIa
(Salazar-Albornoz et al., in perp.)
PRELIMINARY
PRELIMINARY
(Linder E. V., 2005)
f :=@ lnD
@ ln a⇡ ⌦�
m(z)
USING TRUE OBSERVABLES, WE CAN PROBE THE REDSHIFT EVOLUTION OF THE GALAXY-CLUSTERING SIGNAL AND USE THIS INFORMATION TO OBTAIN PRECISE COSMOLOGICAL CONSTRAINTS.
Clustering Tomography
IN SUMMARY 10