Publications (28)
KiDS-1000 Cosmology: constraints beyond flat CDM
Tilman Tröster, Marika Asgari, Chris Blake +26
We present constraints on extensions to the flat CDM cosmological model by varying the spatial curvature , the sum of the neutrino masses , the dark energy equ…
A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies
Hideki Tanimura, Gary Hinshaw, Ian G. McCarthy +6
We search the Planck data for a thermal Sunyaev-Zel'dovich (tSZ) signal due to gas filaments between pairs of Luminous Red Galaxies (LRG's) taken from the Sloan Digital Sky Survey…
The halo model with beyond-linear halo bias: unbiasing cosmological constraints from galaxy-galaxy lensing and clustering
Constance Mahony, Andrej Dvornik, Alexander Mead +6
We determine the error introduced in a joint halo model analysis of galaxy-galaxy lensing and galaxy clustering observables when adopting the standard approximation of linear halo…
KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing
Andrej Dvornik, Catherine Heymans, Marika Asgari +14
We present constraints on the flat CDM cosmological model through a joint analysis of galaxy abundance, galaxy clustering and galaxy-galaxy lensing observables with the Kilo-De…
Unscreening Modified Gravity in the Matter Power Spectrum
Lucas Lombriser, Fergus Simpson, Alexander Mead
Viable modifications of gravity that may produce cosmic acceleration need to be screened in high-density regions such as the Solar System, where general relativity is well tested.…
Surface Flux Patterns on Planets in Circumbinary Systems, and Potential for Photosynthesis
Duncan H. Forgan, Alexander Mead, Charles S. Cockell +1
Recently, the Kepler Space Telescope has detected several planets in orbit around a close binary star system. These so-called circumbinary planets will experience non-trivial spati…
Rapid simulation rescaling from standard to modified gravity models
Alexander Mead, John Peacock, Lucas Lombriser +1
We develop and test an algorithm to rescale a simulated dark-matter particle distribution or halo catalogue from a standard gravity model to that of a modified gravity model. This…
Core Cosmology Library: Precision Cosmological Predictions for LSST
Nora Elisa Chisari, David Alonso, Elisabeth Krause +27
The Core Cosmology Library (CCL) provides routines to compute basic cosmological observables to a high degree of accuracy, which have been verified with an extensive suite of valid…
Perturbative Gaussianizing transforms for cosmological fields
Alex Hall, Alexander Mead
Constraints on cosmological parameters from large-scale structure have traditionally been obtained from two-point statistics. However, non-linear structure formation renders these…
On the road to percent accuracy: nonlinear reaction of the matter power spectrum to dark energy and modified gravity
Matteo Cataneo, Lucas Lombriser, Catherine Heymans +4
We present a general method to compute the nonlinear matter power spectrum for dark energy and modified gravity scenarios with percent-level accuracy. By adopting the halo model an…
CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics
Shahab Joudaki, Chris Blake, Catherine Heymans +9
We investigate the impact of astrophysical systematics on cosmic shear cosmological parameter constraints from the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), and the…
Remapping dark matter halo catalogues between cosmological simulations
Alexander Mead, John Peacock
We present and test a method for modifying the catalogue of dark matter haloes produced from a given cosmological simulation, so that it resembles the result of a simulation with a…
KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering
Shahab Joudaki, Chris Blake, Andrew Johnson +19
We perform a combined analysis of cosmic shear tomography, galaxy-galaxy lensing tomography, and redshift-space multipole power spectra (monopole and quadrupole) using 450 deg…
On constraining Cosmology and the Halo Mass Function with Weak Gravitational Lensing
Shiming Gu, Marc-Antoine Dor, Ludovic van Waerbeke +4
The discrepancy between the weak lensing (WL) and the {\it Planck} measurements of has been a subject of several studies. These studies tend to show that a suppression of the…
Uncertain Evidence in Probabilistic Models and Stochastic Simulators
Andreas Munk, Alexander Mead, Frank Wood
We consider the problem of performing Bayesian inference in probabilistic models where observations are accompanied by uncertainty, referred to as "uncertain evidence." We explore…
HMcode-2020: Improved modelling of non-linear cosmological power spectra with baryonic feedback
Alexander Mead, Samuel Brieden, Tilman Tröster +1
We present an updated version of the HMcode augmented halo model that can be used to make accurate predictions of the non-linear matter power spectrum over a wide range of cosmolog…
An accurate halo model for fitting non-linear cosmological power spectra and baryonic feedback models
Alexander Mead, John Peacock, Catherine Heymans +2
We present an optimized variant of the halo model, designed to produce accurate matter power spectra well into the non-linear regime for a wide range of cosmological models. To do…
Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces
Alexander Mead, Catherine Heymans, Lucas Lombriser +3
We present an accurate non-linear matter power spectrum prediction scheme for a variety of extensions to the standard cosmological paradigm, which uses the tuned halo model previou…
Impact of cosmological signatures in two-point statistics beyond the linear regime
Dante V. Gomez-Navarro, Alexander Mead, Alejandro Aviles +1
Some beyond CDM cosmological models have dark-sector energy densities that suffer phase transitions. Fluctuations entering the horizon during such a transition can receive enha…
Axion Quark Nugget Dark Matter: Time Modulations and Amplifications
Xunyu Liang, Alexander Mead, Md Shahriar Rahim Siddiqui +2
We study the new mechanism of the axion production suggested recently in [1,2]. This mechanism is based on the so-called Axion Quark Nugget (AQN) dark matter model, which was origi…
Spherical collapse, formation hysteresis and the deeply non-linear cosmological power spectrum
Alexander Mead
I examine differences in non-linear structure formation between cosmological models that share a linear power spectrum in both shape and amplitude, but that differ via their…
Constraining AGN feedback model with SZ profile
Hideki Tanimura, Gary Hinshaw, Ian G. McCarthy +7
Relativistic jets from AGN have a wide range of impacts on galaxy groups and clusters and are key for understanding their formation and physical properties. However, this non-gravi…
Probing galaxy bias and intergalactic gas pressure with KiDS Galaxies-tSZ-CMB lensing cross-correlations
Ziang Yan, Ludovic van Waerbeke, Tilman Tröster +14
We constrain the redshift dependence of gas pressure bias (bias-weighted average electron pressure), which characterises the thermo…
Probing hot gas around luminous red galaxies through the Sunyaev-Zel'dovich effect
Hideki Tanimura, Gary Hinshaw, Ian G. McCarthy +7
We construct the mean thermal Sunyaev-Zel'dovich (tSZ) Comptonization y profile around Luminous Red Galaxies (LRGs) in the redshift range 0.16 < z < 0.47 from the Sloan Digital Sky…
KiDS-450: Testing extensions to the standard cosmological model
Shahab Joudaki, Alexander Mead, Chris Blake +16
We test extensions to the standard cosmological model with weak gravitational lensing tomography using 450 deg of imaging data from the Kilo Degree Survey (KiDS). In these exte…
Including beyond-linear halo bias in halo models
Alexander Mead, Licia Verde
We derive a simple prescription for including beyond-linear halo bias within the standard, analytical halo-model power spectrum calculation. This results in a corrective term that…
Gravitationally trapped axions on Earth
Kyle Lawson, Xunyu Liang, Alexander Mead +3
We advocate for the idea that there is a fundamentally new mechanism for axion production on Earth, as recently suggested in Fischer et al. (2018) and Liang & Zhitnitsky (2018). We…
Remapping simulated halo catalogues in redshift space
Alexander Mead, John Peacock
We discuss the extension to redshift space of a rescaling algorithm, designed to alter the effective cosmology of a pre-existing simulated particle distribution or catalogue of dar…