scholarly journals Cosmological constraints from a combination of galaxy clustering and lensing – I. Theoretical framework

2013 ◽  
Vol 430 (2) ◽  
pp. 725-746 ◽  
Author(s):  
Frank C. van den Bosch ◽  
Surhud More ◽  
Marcello Cacciato ◽  
Houjun Mo ◽  
Xiaohu Yang
Keyword(s):  
Theoretical Framework ◽  
Galaxy Clustering ◽  
Cosmological Constraints

scholarly journals Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

2020 ◽  
Vol 500 (1) ◽  
pp. 911-925
Author(s):  
Carlos M Correa ◽  
Dante J Paz ◽  
Ariel G Sánchez ◽  
Andrés N Ruiz ◽  
Nelson D Padilla ◽  
...  
Keyword(s):  
Theoretical Framework ◽  
Real Space ◽  
Global Dynamics ◽  
Void Size ◽  
Spherical Void ◽  
Cosmological Constraints ◽  
Redshift Surveys ◽  
Size Function ◽  
Expansion Effect ◽  
Space Effects

ABSTRACT Voids are promising cosmological probes. Nevertheless, every cosmological test based on voids must necessarily employ methods to identify them in redshift space. Therefore, redshift-space distortions (RSD) and the Alcock–Paczyński effect (AP) have an impact on the void identification process itself generating distortion patterns in observations. Using a spherical void finder, we developed a statistical and theoretical framework to describe physically the connection between the identification in real and redshift space. We found that redshift-space voids above the shot noise level have a unique real-space counterpart spanning the same region of space, they are systematically bigger and their centres are preferentially shifted along the line of sight. The expansion effect is a by-product of RSD induced by tracer dynamics at scales around the void radius, whereas the off-centring effect constitutes a different class of RSD induced at larger scales by the global dynamics of the whole region containing the void. The volume of voids is also altered by the fiducial cosmology assumed to measure distances, this is the AP change of volume. These three systematics have an impact on cosmological statistics. In this work, we focus on the void size function. We developed a theoretical framework to model these effects and tested it with a numerical simulation, recovering the statistical properties of the abundance of voids in real space. This description depends strongly on cosmology. Hence, we lay the foundations for improvements in current models of the abundance of voids in order to obtain unbiased cosmological constraints from redshift surveys.

scholarly journals Cosmology from large-scale structure

2020 ◽  
Vol 633 ◽  
pp. L10 ◽  
Author(s):  
Tilman Tröster ◽  
Ariel. G. Sánchez ◽  
Marika Asgari ◽  
Chris Blake ◽  
Martín Crocce ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Parameter Space ◽  
Large Scale ◽  
Bayes Factor ◽  
Large Scale Structure ◽  
Data Sets ◽  
Microwave Background ◽  
Shape Information ◽  
Galaxy Clustering ◽  
Cosmological Constraints

We reanalyse the anisotropic galaxy clustering measurement from the Baryon Oscillation Spectroscopic Survey (BOSS), demonstrating that using the full shape information provides cosmological constraints that are comparable to other low-redshift probes. We find Ωm = 0.317+0.015−0.019, σ8 = 0.710±0.049, and h = 0.704 ± 0.024 for flat ΛCDM cosmologies using uninformative priors on Ωch2, 100θMC, ln1010As, and ns, and a prior on Ωbh2 that is much wider than current constraints. We quantify the agreement between the Planck 2018 constraints from the cosmic microwave background and BOSS, finding the two data sets to be consistent within a flat ΛCDM cosmology using the Bayes factor as well as the prior-insensitive suspiciousness statistic. Combining two low-redshift probes, we jointly analyse the clustering of BOSS galaxies with weak lensing measurements from the Kilo-Degree Survey (KV450). The combination of BOSS and KV450 improves the measurement by up to 45%, constraining σ8 = 0.702 ± 0.029 and S8 = σ8 Ωm/0.3 = 0.728 ± 0.026. Over the full 5D parameter space, the odds in favour of a single cosmology describing galaxy clustering, lensing, and the cosmic microwave background are 7 ± 2. The suspiciousness statistic signals a 2.1 ± 0.3σ tension between the combined low-redshift probes and measurements from the cosmic microwave background.

scholarly journals Cosmological constraints from galaxy clustering in the presence of massive neutrinos

2018 ◽  
Vol 477 (1) ◽  
pp. 491-506 ◽  
Author(s):  
M Zennaro ◽  
J Bel ◽  
J Dossett ◽  
C Carbone ◽  
L Guzzo
Keyword(s):  
Galaxy Clustering ◽  
Cosmological Constraints ◽  
Massive Neutrinos

scholarly journals Dark Energy Survey Year 3 results: Cosmological constraints from galaxy clustering and weak lensing

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
T. M. C. Abbott ◽  
M. Aguena ◽  
A. Alarcon ◽  
S. Allam ◽  
O. Alves ◽  
...  
Keyword(s):  
Dark Energy ◽  
Weak Lensing ◽  
Galaxy Clustering ◽  
Cosmological Constraints ◽  
Dark Energy Survey ◽  
Energy Survey

scholarly journals COSMOLOGICAL CONSTRAINTS FROM GALAXY CLUSTERING AND THE MASS-TO-NUMBER RATIO OF GALAXY CLUSTERS

2011 ◽  
Vol 745 (1) ◽  
pp. 16 ◽  
Author(s):  
Jeremy L. Tinker ◽  
Erin S. Sheldon ◽  
Risa H. Wechsler ◽  
Matthew R. Becker ◽  
Eduardo Rozo ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
Galaxy Clustering ◽  
Cosmological Constraints ◽  
Number Ratio

scholarly journals Cosmological constraints from a combination of galaxy clustering and lensing – III. Application to SDSS data

2013 ◽  
Vol 430 (2) ◽  
pp. 767-786 ◽  
Author(s):  
Marcello Cacciato ◽  
Frank C. van den Bosch ◽  
Surhud More ◽  
Houjun Mo ◽  
Xiaohu Yang
Keyword(s):  
Galaxy Clustering ◽  
Cosmological Constraints

scholarly journals Cosmological constraints from a combination of galaxy clustering and lensing – II. Fisher matrix analysis

2013 ◽  
Vol 430 (2) ◽  
pp. 747-766 ◽  
Author(s):  
Surhud More ◽  
Frank C. van den Bosch ◽  
Marcello Cacciato ◽  
Anupreeta More ◽  
Houjun Mo ◽  
...  
Keyword(s):  
Matrix Analysis ◽  
Galaxy Clustering ◽  
Fisher Matrix ◽  
Cosmological Constraints

scholarly journals Dark Energy Survey year 1 results: Cosmological constraints from galaxy clustering and weak lensing

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
T. M. C. Abbott ◽  
F. B. Abdalla ◽  
A. Alarcon ◽  
J. Aleksić ◽  
S. Allam ◽  
...  
Keyword(s):  
Dark Energy ◽  
Weak Lensing ◽  
Galaxy Clustering ◽  
Cosmological Constraints ◽  
Dark Energy Survey ◽  
Energy Survey
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