Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Kratochvil, Jan M."'
CosmoGAN: creating high-fidelity weak lensing convergence maps using Generative Adversarial Networks
Autor:
Mustafa, Mustafa, Bard, Deborah, Bhimji, Wahid, Lukić, Zarija, Al-Rfou, Rami, Kratochvil, Jan M.
Publikováno v:
Computational Astrophysics and CosmologySimulations, Data Analysis and Algorithms 2019 6:1
Inferring model parameters from experimental data is a grand challenge in many sciences, including cosmology. This often relies critically on high fidelity numerical simulations, which are prohibitively computationally expensive. The application of d
Externí odkaz:
http://arxiv.org/abs/1706.02390
Publikováno v:
Phys. Rev. D, 91, 103511 (2015)
Weak gravitational lensing is a powerful cosmological probe, with non--Gaussian features potentially containing the majority of the information. We examine constraints on the parameter triplet $(\Omega_m,w,\sigma_8)$ from non-Gaussian features of the
Externí odkaz:
http://arxiv.org/abs/1503.06214
Publikováno v:
Phys. Rev. D 91, 063507 (2015)
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 exami
Externí odkaz:
http://arxiv.org/abs/1412.0757
The statistics of shear peaks have been shown to provide valuable cosmological information beyond the power spectrum, and will be an important constraint of models of cosmology with the large survey areas provided by forthcoming astronomical surveys.
Externí odkaz:
http://arxiv.org/abs/1410.5446
Publikováno v:
Phys. Rev. D 90, 123015 (2014)
Residual errors in shear measurements, after corrections for instrument systematics and atmospheric effects, can impact cosmological parameters derived from weak lensing observations. Here we combine convergence maps from our suite of ray-tracing sim
Externí odkaz:
http://arxiv.org/abs/1409.5130
Publikováno v:
Phys. Rev. D 89, 023515 (2014), 14pp
The weak lensing power spectrum is a powerful tool to probe cosmological parameters. Additionally, lensing peak counts contain cosmological information beyond the power spectrum. Both of these statistics can be affected by the preferential selection
Externí odkaz:
http://arxiv.org/abs/1310.7517
Publikováno v:
Phys. Rev. D 88, 123002 (2013)
We compare the efficiency of moments and Minkowski functionals (MFs) in constraining the subset of cosmological parameters (Omega_m,w,sigma_8) using simulated weak lensing convergence maps. We study an analytic perturbative expansion of the MFs in te
Externí odkaz:
http://arxiv.org/abs/1309.4460
Peaks in two-dimensional weak lensing (WL) maps contain significant cosmological information, complementary to the WL power spectrum. This has recently been demonstrated using N-body simulations which neglect baryonic effects. Here we employ ray-trac
Externí odkaz:
http://arxiv.org/abs/1210.0608
Cosmological measurements require the calculation of nontrivial quantities over large datasets. The next generation of survey telescopes (such as DES, PanSTARRS, and LSST) will yield measurements of billions of galaxies. The scale of these datasets,
Externí odkaz:
http://arxiv.org/abs/1208.3658
Publikováno v:
Physical Review D, vol. 84, Issue 4, id. 043529 (2011)
Recent studies have shown that the number counts of convergence peaks N(kappa) in weak lensing (WL) maps, expected from large forthcoming surveys, can be a useful probe of cosmology. We follow up on this finding, and use a suite of WL convergence map
Externí odkaz:
http://arxiv.org/abs/1109.6333