Cosmology Constraints from the Weak Lensing Peak Counts and the Power Spectrum in CFHTLenS
Abstract
Lensing peaks have been proposed as a useful statistic, containing cosmological information from non-Gaussianities that is inaccessible from traditional two-point statistics such as the power spectrum or two-point correlation functions. Here we examine constraints on cosmological parameters from weak lensing peak counts, using the publicly available data from the 154 deg2 CFHTLenS survey. We utilize a new suite of ray-tracing N-body simulations on a grid of 91 cosmological models, covering broad ranges of the three parameters Ωm, σ8, and w, and replicating the galaxy sky positions, redshifts, and shape noise in the CFHTLenS observations. We then build an emulator that interpolates the power spectrum and the peak counts to an accuracy of ≤ 5%, and compute the likelihood in the three-dimensional parameter space (Ωm, σ8, w) from both observables. We find that constraints from peak counts are comparable to those from the power spectrum, and somewhat tighter when different smoothing scales are combined. Neither observable can constrain w without external data. When the power spectrum and peak counts are combined, the area of the error “banana” in the (Ωm, σ8) plane reduces by a factor of ≈ two, compared to using the power spectrum alone. For a flat Λ coldmore »
- Authors:
-
- Department of Astronomy and Astrophysics, Columbia University, New York, NY, (United States)
- Physics Department, Brookhaven National Laboratory, Upton, NY, (United States)
- Department of Physics, Columbia University, New York, NY, (United States)
- Department of Astronomy and Astrophysics, Columbia University, New York, NY, (United States); Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP), Columbia University, New York, (United States)
- Department of Physics, Columbia University, New York, NY, (United States); Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP), Columbia University, New York, (United States)
- Astrophysics and Cosmology Research Unit, University of KwaZulu-Natal, Westville, Durban, (South Africa)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1174105
- Alternate Identifier(s):
- OSTI ID: 1181291
- Report Number(s):
- BNL-107476-2015-JA
Journal ID: ISSN 1550-7998; KA2301020
- Grant/Contract Number:
- SC00112704; AC02-98CH10886; SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 6; Journal ID: ISSN 1550-7998
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Liu, Jia, May, Morgan, Petri, Andrea, Haiman, Zoltan, Hui, Lam, and Kratochvil, Jan M. Cosmology Constraints from the Weak Lensing Peak Counts and the Power Spectrum in CFHTLenS. United States: N. p., 2015.
Web. doi:10.1103/PhysRevD.91.063507.
Liu, Jia, May, Morgan, Petri, Andrea, Haiman, Zoltan, Hui, Lam, & Kratochvil, Jan M. Cosmology Constraints from the Weak Lensing Peak Counts and the Power Spectrum in CFHTLenS. United States. https://doi.org/10.1103/PhysRevD.91.063507
Liu, Jia, May, Morgan, Petri, Andrea, Haiman, Zoltan, Hui, Lam, and Kratochvil, Jan M. Wed .
"Cosmology Constraints from the Weak Lensing Peak Counts and the Power Spectrum in CFHTLenS". United States. https://doi.org/10.1103/PhysRevD.91.063507. https://www.osti.gov/servlets/purl/1174105.
@article{osti_1174105,
title = {Cosmology Constraints from the Weak Lensing Peak Counts and the Power Spectrum in CFHTLenS},
author = {Liu, Jia and May, Morgan and Petri, Andrea and Haiman, Zoltan and Hui, Lam and Kratochvil, Jan M.},
abstractNote = {Lensing peaks have been proposed as a useful statistic, containing cosmological information from non-Gaussianities that is inaccessible from traditional two-point statistics such as the power spectrum or two-point correlation functions. Here we examine constraints on cosmological parameters from weak lensing peak counts, using the publicly available data from the 154 deg2 CFHTLenS survey. We utilize a new suite of ray-tracing N-body simulations on a grid of 91 cosmological models, covering broad ranges of the three parameters Ωm, σ8, and w, and replicating the galaxy sky positions, redshifts, and shape noise in the CFHTLenS observations. We then build an emulator that interpolates the power spectrum and the peak counts to an accuracy of ≤ 5%, and compute the likelihood in the three-dimensional parameter space (Ωm, σ8, w) from both observables. We find that constraints from peak counts are comparable to those from the power spectrum, and somewhat tighter when different smoothing scales are combined. Neither observable can constrain w without external data. When the power spectrum and peak counts are combined, the area of the error “banana” in the (Ωm, σ8) plane reduces by a factor of ≈ two, compared to using the power spectrum alone. For a flat Λ cold dark matter model, combining both statistics, we obtain the constraint σ8(Ωm/0.27)0.63 = 0.85+0.03-0.03.},
doi = {10.1103/PhysRevD.91.063507},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 6,
volume = 91,
place = {United States},
year = {Wed Mar 04 00:00:00 EST 2015},
month = {Wed Mar 04 00:00:00 EST 2015}
}
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Cosmological Simulations for Combined-Probe Analyses: Covariance and Neighbour-Exclusion Bias
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- Harnois-Deraps, J.; Amon, A.; Choi, A.
- arXiv
Cosmological constraints from noisy convergence maps through deep learning
text, January 2018
- Fluri, Janis; Kacprzak, Tomasz; Lucchi, Aurelien
- arXiv
Constraining neutrino mass with tomographic weak lensing peak counts
text, January 2018
- Li, Zack; Liu, Jia; Matilla, José Manuel Zorrilla
- arXiv
Weak lensing cosmology with convolutional neural networks on noisy data
text, January 2019
- Ribli, Dezső; Pataki, Bálint Ármin; Matilla, José Manuel Zorrilla
- arXiv
The matter fluctuation amplitude inferred from the weak lensing power spectrum and correlation function in CFHTLenS data
text, January 2019
- Lu, Tianhuan; Haiman, Zoltán
- arXiv
On the road to percent accuracy II: calibration of the non-linear matter power spectrum for arbitrary cosmologies
text, January 2019
- Giblin, Benjamin; Cataneo, Matteo; Moews, Ben
- arXiv
Cosmological studies from tomographic weak lensing peak abundances and impacts of photo-z errors
text, January 2019
- Yuan, Shuo; Pan, Chuzhong; Liu, Xiangkun
- arXiv