scholarly journals Preparing for the cosmic shear data flood: Optimal data extraction and simulation requirements for stage IV dark energy experiments

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
Peter L. Taylor ◽  
Thomas D. Kitching ◽  
Jason D. McEwen
Keyword(s):  
Dark Energy ◽  
Data Extraction ◽  
Stage Iv ◽  
Cosmic Shear ◽  
Data Flood

scholarly journals The halo model as a versatile tool to predict intrinsic alignments

2020 ◽  
Author(s):  
Maria Cristina Fortuna ◽  
Henk Hoekstra ◽  
Benjamin Joachimi ◽  
Harry Johnston ◽  
Nora Elisa Chisari ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Power Spectra ◽  
Stage Iv ◽  
Stage Iii ◽  
Radial Dependence ◽  
Additional Parameter ◽  
Small Scales ◽  
Cosmic Shear ◽  
Galaxy Populations ◽  
The Impact

Abstract Intrinsic alignments (IAs) of galaxies are an important contaminant for cosmic shear studies, but the modelling is complicated by the dependence of the signal on the source galaxy sample. In this paper, we use the halo model formalism to capture this diversity and examine its implications for Stage-III and Stage-IV cosmic shear surveys. We account for the different IA signatures at large and small scales, as well for the different contributions from central/satellite and red/blue galaxies, and we use realistic mocks to account for the characteristics of the galaxy populations as a function of redshift. We inform our model using the most recent observational findings: we include a luminosity dependence at both large and small scales and a radial dependence of the signal within the halo. We predict the impact of the total IA signal on the lensing angular power spectra, including the current uncertainties from the IA best-fits to illustrate the range of possible impact on the lensing signal: the lack of constraints for fainter galaxies is the main source of uncertainty for our predictions of the IA signal. We investigate how well effective models with limited degrees of freedom can account for the complexity of the IA signal. Although these lead to negligible biases for Stage-III surveys, we find that, for Stage-IV surveys, it is essential to at least include an additional parameter to capture the redshift dependence.

scholarly journals KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

2020 ◽  
Vol 638 ◽  
pp. L1 ◽  
Author(s):  
S. Joudaki ◽  
H. Hildebrandt ◽  
D. Traykova ◽  
N. E. Chisari ◽  
C. Heymans ◽  
...  
Keyword(s):  
Dark Energy ◽  
Cosmic Microwave Background ◽  
Gravitational Lensing ◽  
Error Model ◽  
Calibration Error ◽  
Microwave Background ◽  
Weak Gravitational Lensing ◽  
Dark Energy Survey ◽  
Cosmic Shear ◽  
Energy Survey

We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a 0.8σ reduction in the DES-inferred value for S​8, which decreases to a 0.5σ reduction when including a systematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450+DES-Y1 constraint on S8 = 0.762−0.024+0.025 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2.5σ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak-lensing surveys.

scholarly journals Inference from the small scales of cosmic shear with current and future Dark Energy Survey data

2016 ◽  
Vol 465 (3) ◽  
pp. 2567-2583 ◽  
Author(s):  
N. MacCrann ◽  
J. Aleksić ◽  
A. Amara ◽  
S. L. Bridle ◽  
C. Bruderer ◽  
...  
Keyword(s):  
Dark Energy ◽  
Survey Data ◽  
Dark Energy Survey ◽  
Small Scales ◽  
Cosmic Shear ◽  
Energy Survey

scholarly journals Cosmic shear measurements with Dark Energy Survey Science Verification data

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
M. R. Becker ◽  
M. A. Troxel ◽  
N. MacCrann ◽  
E. Krause ◽  
T. F. Eifler ◽  
...  
Keyword(s):  
Dark Energy ◽  
Dark Energy Survey ◽  
Cosmic Shear ◽  
Energy Survey

scholarly journals Dark Energy Survey Year 3 results: Cosmology from cosmic shear and robustness to modeling uncertainty

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
L. F. Secco ◽  
S. Samuroff ◽  
E. Krause ◽  
B. Jain ◽  
J. Blazek ◽  
...  
Keyword(s):  
Dark Energy ◽  
Modeling Uncertainty ◽  
Dark Energy Survey ◽  
Cosmic Shear ◽  
Energy Survey

scholarly journals Dark Energy Survey Year 3 results: Cosmology from cosmic shear and robustness to data calibration

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
A. Amon ◽  
D. Gruen ◽  
M. A. Troxel ◽  
N. MacCrann ◽  
S. Dodelson ◽  
...  
Keyword(s):  
Dark Energy ◽  
Dark Energy Survey ◽  
Cosmic Shear ◽  
Energy Survey ◽  
Data Calibration

scholarly journals KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs

2020 ◽  
Vol 634 ◽  
pp. A127 ◽  
Author(s):  
Marika Asgari ◽  
Tilman Tröster ◽  
Catherine Heymans ◽  
Hendrik Hildebrandt ◽  
Jan Luca van den Busch ◽  
...  
Keyword(s):  
Dark Energy ◽  
Mode Analysis ◽  
Small Scale ◽  
Microwave Background ◽  
Cosmological Constraints ◽  
Dark Energy Survey ◽  
Matter Power Spectrum ◽  
Λcdm Model ◽  
Cosmic Shear ◽  
Energy Survey

We present cosmological constraints from a joint cosmic shear analysis of the Kilo-Degree Survey (KV450) and the Dark Energy Survey (DES-Y1), which were conducted using Complete Orthogonal Sets of E/B-Integrals (COSEBIs). With COSEBIs, we isolated any B-modes that have a non-cosmic shear origin and demonstrate the robustness of our cosmological E-mode analysis as no significant B-modes were detected. We highlight how COSEBIs are fairly insensitive to the amplitude of the non-linear matter power spectrum at high k-scales, mitigating the uncertain impact of baryon feedback in our analysis. COSEBIs, therefore, allowed us to utilise additional small-scale information, improving the DES-Y1 joint constraints on S8 = σ8(Ωm/0.3)0.5 and Ωm by 20%. By adopting a flat ΛCDM model we find S8 = 0.755−0.021+0.019, which is in 3.2σ tension with the Planck Legacy analysis of the cosmic microwave background.

scholarly journals Interacting dark energy in the early 2020s: A promising solution to the H0 and cosmic shear tensions

2020 ◽  
Vol 30 ◽  
pp. 100666 ◽  
Author(s):  
Eleonora Di Valentino ◽  
Alessandro Melchiorri ◽  
Olga Mena ◽  
Sunny Vagnozzi
Keyword(s):  
Dark Energy ◽  
Interacting Dark Energy ◽  
Promising Solution ◽  
Cosmic Shear

scholarly journals Cosmology from cosmic shear with Dark Energy Survey Science Verification data

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
T. Abbott ◽  
F. B. Abdalla ◽  
S. Allam ◽  
A. Amara ◽  
J. Annis ◽  
...  
Keyword(s):  
Dark Energy ◽  
Dark Energy Survey ◽  
Cosmic Shear ◽  
Energy Survey
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