96 citations · 749 across the 31 of their papers we have counts for
29 papers · 1 filter
Sparse Bayesian mass-mapping using trans-dimensional MCMC
Augustin Marignier, Thomas Kitching, Jason D. McEwen +1
Uncertainty quantification is a crucial step of cosmological mass-mapping that is often ignored. Suggested methods are typically only approximate or make strong assumptions of Gaus…
A New Estimator for Phase Statistics
D. Munshi, R. Takahashi, J. D. McEwen +2
We introduce a novel statistic to probe the statistics of phases of Fourier modes in two-dimensions (2D) for weak lensing convergence field . This statistic contains completely…
Position-Dependent Correlation Function of Weak Lensing Convergence
D. Munshi, G. Jung, T. D. Kitching +4
We provide a systematic study of the position-dependent correlation function in weak lensing convergence maps and its relation to the squeezed limit of the three-point correlation…
Morphology of Weak Lensing Convergence Maps
D. Munshi, T. Namikawa, J. D. McEwen +2
We study the morphology of convergence maps by perturbatively reconstructing their Minkowski Functionals (MFs). We present a systematics study using a set of three generalised skew…
Weak Lensing Skew-Spectrum
D. Munshi, T. Namikawa, T. D. Kitching +2
We introduce the skew-spectrum statistic for weak lensing convergence maps and test it against state-of-the-art high-resolution all-sky numerical simulations. We perform the an…
Spherical Bayesian mass-mapping with uncertainties: full sky observations on the celestial sphere
Matthew A. Price, Jason D. McEwen, L. Pratley +1
To date weak gravitational lensing surveys have typically been restricted to small fields of view, such that the has been sufficiently satisfied.…
Massive neutrinos and degeneracies in Lyman-alpha forest simulations
Christian Pedersen, Andreu Font-Ribera, Thomas D. Kitching +5
Using a suite of hydrodynamical simulations with cold dark matter, baryons, and neutrinos, we present a detailed study of the effect of massive neutrinos on the 1-D and 3-D flux po…
The Weak Lensing Bispectrum Induced By Gravity
D. Munshi, T. Namikawa, T. D. Kitching +5
Recent studies have demonstrated that {\em secondary} non-Gaussianity induced by gravity will be detected with a high signal-to-noise (S/N) by future and even by on-going weak lens…
Cosmic Shear: Inference from Forward Models
Peter L. Taylor, Thomas D. Kitching, Justin Alsing +3
Density-estimation likelihood-free inference (DELFI) has recently been proposed as an efficient method for simulation-based cosmological parameter inference. Compared to the standa…
Estimating the Integrated Bispectrum from Weak Lensing Maps
D. Munshi, J. D. McEwen, T. Kitching +3
We use a recently introduced statistic called {\em Integrated Bispectrum} (IB) to probe the gravity-induced non-Gaussianity at the level of the bispectrum from weak lensing converg…
Rainbow Cosmic Shear: Optimisation of Tomographic Bins
T. D. Kitching, P. L. Taylor, P. Capak +2
In this paper we address the problem of finding optimal cosmic shear tomographic bins. We generalise the definition of a cosmic shear tomographic bin to be a set of commonly labell…
Covariant polarized radiative transfer on cosmological scales for investigating large-scale magnetic field structures
Jennifer Y. H. Chan, Kinwah Wu, Alvina Y. L. On +3
Polarization of radiation is a powerful tool to study cosmic magnetism and analysis of polarization can be used as a diagnostic tool for large-scale structures. In this paper, we p…
Sparse Bayesian mass-mapping with uncertainties: peak statistics and feature locations
Matthew A. Price, Xiaohao Cai, Jason D. McEwen +1
Weak lensing convergence maps - upon which higher order statistics can be calculated - can be recovered from observations of the shear field by solving the lensing inverse problem.…
Sparse Bayesian mass-mapping with uncertainties: local credible intervals
Matthew A. Price, Xiaohao Cai, Jason D. McEwen +2
Until recently mass-mapping techniques for weak gravitational lensing convergence reconstruction have lacked a principled statistical framework upon which to quantify reconstructio…
Sparse Bayesian mass-mapping with uncertainties: hypothesis testing of structure
Matthew A. Price, Jason D. McEwen, Xiaohao Cai +2
A crucial aspect of mass-mapping, via weak lensing, is quantification of the uncertainty introduced during the reconstruction process. Properly accounting for these errors has been…
k-cut Cosmic Shear: Tunable Power Spectrum Sensitivity to Test Gravity
Peter L. Taylor, Francis Bernardeau, Thomas D. Kitching
If left unchecked modeling uncertainties at small scales, due to poorly understood baryonic physics and non-linear structure formation, will significantly bias Stage IV cosmic shea…
Non-parametric Cosmology with Cosmic Shear
Peter L. Taylor, Thomas D. Kitching, Jason D. McEwen
We present a method to measure the growth of structure and the background geometry of the Universe -- with no a priori assumption about the underlying cosmological model. Using Can…
3D cosmic shear: numerical challenges, 3D lensing random fields generation and Minkowski Functionals for cosmological inference
A. Spurio Mancini, P. L. Taylor, R. Reischke +5
Cosmic shear - the weak gravitational lensing effect generated by fluctuations of the gravitational tidal fields of the large-scale structure - is one of the most promising tools f…
Testing the Cosmic Shear Spatially-Flat Universe Approximation with Generalized Lensing and Shear Spectra
Peter L. Taylor, Thomas D. Kitching, Jason D. McEwen +1
We introduce the Generalised Lensing and Shear Spectra GLaSS code which is available for download from https://github.com/astro-informatics/GLaSS It is a fast and flexible public c…
Preparing for the Cosmic Shear Data Flood: Optimal Data Extraction and Simulation Requirements for Stage IV Dark Energy Experiments
Peter L. Taylor, Thomas D. Kitching, Jason D. McEwen
Upcoming photometric lensing surveys will considerably tighten constraints on the neutrino mass and the dark energy equation of state. Nevertheless it remains an open question of h…
Implications for the missing low-mass galaxies (satellites) problem from cosmic shear
Raul Jimenez, Licia Verde, Thomas D. Kitching
The number of observed dwarf galaxies, with dark matter mass M in the Milky Way or the Andromeda galaxy does not agree with predictions from the succes…
Mapping dark matter on the celestial sphere with weak gravitational lensing
Christopher G. R. Wallis, Matthew A. Price, Jason D. McEwen +3
Convergence maps of the integrated matter distribution are a key science result from weak gravitational lensing surveys. To date, recovering convergence maps has been performed usi…
Unequal-Time Correlators for Cosmology
T. D. Kitching, A. F. Heavens
Measurements of the power spectrum from large-scale structure surveys have to date assumed an equal-time approximation, where the full cross-correlation power spectrum of the matte…
The Limits of Cosmic Shear
Thomas D. Kitching, Justin Alsing, Alan F. Heavens +3
In this paper we discuss the commonly-used limiting cases, or approximations, for two-point cosmic shear statistics. We discuss the most prominent assumptions in this statistic: th…