Publications (49)
The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and CDM Parameters
Thibaut Louis, Adrien La Posta, Zachary Atkins +165
We present power spectra of the cosmic microwave background (CMB) anisotropy in temperature and polarization, measured from the Data Release 6 maps made from Atacama Cosmology Tele…
Constraining Scalar-Tensor Modified Gravity with Gravitational Waves and Large Scale Structure Surveys
Tessa Baker, Ian Harrison
The first multi-messenger gravitational wave event has had a transformative effect on the space of modified gravity models. In this paper we study the enhanced tests of gravity tha…
Cosmology and Source Redshift Distributions from Combining Radio Weak Lensing with CMB Lensing
Alba Kalaja, Ian Harrison, William R Coulton
Measurements of weak gravitational lensing using the cosmic microwave background and the shapes of galaxies have refined our understanding of the late-time history of the Universe.…
Propagating data-driven galaxy redshift distribution uncertainties in 32-pt analyses
Jaime Ruiz-Zapatero, Qianjun Hang, Yun-Hao Zhang +7
Uncertainties in the radial distribution of galaxies, , are one of the major contributions to the error budget of early Stage-IV galaxy survey analy…
The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters
Mathew S. Madhavacheril, Frank J. Qu, Blake D. Sherwin +156
We present cosmological constraints from a gravitational lensing mass map covering 9400 sq. deg. reconstructed from CMB measurements made by the Atacama Cosmology Telescope (ACT) f…
Cosmology Intertwined II: The Hubble Constant Tension
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +90
The current cosmological probes have provided a fantastic confirmation of the standard Cold Dark Matter cosmological model, that has been constrained with unprecedented accura…
SKA Weak Lensing III: Added Value of Multi-Wavelength Synergies for the Mitigation of Systematics
Stefano Camera, Ian Harrison, Anna Bonaldi +1
In this third paper of a series on radio weak lensing for cosmology with the Square Kilometre Array, we scrutinise synergies between cosmic shear measurements in the radio and opti…
The Atacama Cosmology Telescope: DR6 Maps
Sigurd Naess, Yilun Guan, Adriaan J. Duivenvoorden +163
We present Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) maps of the Cosmic Microwave Background temperature and polarization anisotropy at arcminute resolution over three…
Redshifts for galaxies in radio continuum surveys from Bayesian model fitting of HI 21-cm lines
Ian Harrison, Michelle Lochner, Michael L. Brown
We introduce a new Bayesian HI spectral line fitting technique capable of obtaining spectroscopic redshifts for millions of galaxies in radio surveys with the Square Kilometere Arr…
A Consistent Approach to Falsifying Lambda-CDM with Rare Galaxy Clusters
Ian Harrison, Shaun Hotchkiss
We consider methods with which to answer the question "is any observed galaxy cluster too unusual for Lambda-CDM?" After emphasising that many previous attempts to answer this ques…
Radio-Optical Galaxy Shape Correlations in the COSMOS Field
Ben Tunbridge, Ian Harrison, Michael L. Brown
We investigate the correlations in galaxy shapes between optical and radio wavelengths using archival observations of the COSMOS field. Cross-correlation studies between different…
Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
Square Kilometre Array Cosmology Science Working Group, David J. Bacon, Richard A. Battye +44
We present a detailed overview of the cosmological surveys that will be carried out with Phase 1 of the Square Kilometre Array (SKA1), and the science that they will enable. We hig…
Cosmology from Nx2pt Analyses of SKAO Wide-Area Surveys
Ian Harrison, Ziad Sakr, Giulia Piccirilli +7
The paper forecasts how combined analyses of galaxy clustering, weak lensing, galaxy‑galaxy lensing and 21 cm intensity mapping from SKA‑Mid surveys can measure ΛCDM parameters to…
Brightest Cluster Galaxy ellipticity as proxy for halo shape: Orientation bias, assembly bias, and potential selection effects in SZ-selected clusters
Radhakrishnan Srinivasan, Tae-hyeon Shin, Anja von der Linden +93
The orientation of triaxial galaxy clusters with respect to the line-of-sight is expected to be one of the prime sources of scatter and potential bias in optical observables (e.g.,…
Large Bandgap Observed on the Surfaces of EuZn2As2 Single Crystals
Dejia Kong, Siavash Karbasizadeh, Ganesh Narasimha +7
EuM2As2 (M = Zn, Cd, In, Sn etc.) is an excellent material system for studying topological properties, which can be easily tuned by magnetism involved. Theoretical calculations pre…
SkyPy: A package for modelling the Universe
Adam Amara, Lucia F. de la Bella, Simon Birrer +18
SkyPy is an open-source Python package for simulating the astrophysical sky. It comprises a library of physical and empirical models across a range of observables and a command-lin…
Weak Lensing Simulations for the SKA
Prina Patel, Ian Harrison, Sphesihle Makhathini +6
Weak gravitational lensing measurements are traditionally made at optical wavelengths where many highly resolved galaxy images are readily available. However, the Square Kilometre…
LISA Pathfinder
Michele Armano, Heather Audley, Jonathon Baird +75
Since the 2017 Nobel Prize in Physics was awarded for the observation of gravitational waves, it is fair to say that the epoch of gravitational wave astronomy (GWs) has begun. Howe…
Testing Cosmology with Extreme Galaxy Clusters
Ian Harrison, Peter Coles
Motivated by recent suggestions that a number of observed galaxy clusters have masses which are too high for their given redshift to occur naturally in a standard model cosmology,…
Cosmology Intertwined I: Perspectives for the Next Decade
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +89
The standard Cold Dark Matter cosmological model provides an amazing description of a wide range of astrophysical and astronomical data. However, there are a few big open ques…
Weak gravitational lensing with CO galaxies
Philip Bull, Ian Harrison, Eric Huff
Optical weak lensing surveys have become a powerful tool for precision cosmology, but remain subject to systematic effects that can severely bias cosmological parameter estimates i…
SuperCLASS -- I. The Super CLuster Assisted Shear Survey: Project overview and Data Release 1
Richard A. Battye, Michael L. Brown, Caitlin M. Casey +24
The SuperCLuster Assisted Shear Survey (SuperCLASS) is a legacy programme using the e-MERLIN interferometric array. The aim is to observe the sky at L-band (1.4 GHz) to a r.m.s. of…
Cosmology from Synergies Between SKAO Surveys and Gravitational Wave Observations
Tessa Baker, Alberto Colombo, Steven Cunnington +11
Both radio surveys and gravitational wave observations have the potential to probe unprecedented volumes in the Universe with systematics independent of existing cosmological probe…
Dark Energy Survey Year 3 results: Marginalisation over redshift distribution uncertainties using ranking of discrete realisations
Juan P. Cordero, Ian Harrison, Richard P. Rollins +92
Cosmological information from weak lensing surveys is maximised by dividing source galaxies into tomographic sub-samples for which the redshift distributions are estimated. Uncerta…
SuperCLASS -- II: Photometric Redshifts and Characteristics of Spatially-Resolved Jy Radio Sources
Sinclaire M. Manning, Caitlin M. Casey, Chao-Ling Hung +12
We present optical and near-infrared imaging covering a 1.53 deg region in the Super-Cluster Assisted Shear Survey (SuperCLASS) field, which aims to make the first robust…
Overview: Cosmology with the SKAO
Marta Spinelli, Ian Harrison, Richard A. Battye +5
The SKA telescopes will revolutionise our ability to do cosmology at radio wavelengths, via both their own data and in synergy with other wavelengths. SKAO will be the first instru…
Radio sirens: inferring with binary black holes and neutral hydrogen in the era of the Einstein Telescope and the SKA Observatory
Ulyana Dupletsa, Simone Mastrogiovanni, Marta Spinelli +11
A new synergy between gravitational waves (GWs) and the study of the large-scale structure of the Universe is now emerging. Along this line of research, we combine simulated observ…
The PLATO Mission
Heike Rauer, Conny Aerts, Juan Cabrera +842
PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large numb…
Extreme Value Statistics of the Halo and Stellar Mass Distributions at High Redshift: are JWST Results in Tension with ÎCDM?
Christopher C. Lovell, Ian Harrison, Yuichi Harikane +2
The distribution of dark matter halo masses can be accurately predicted in the CDM cosmology. The presence of a single massive halo or galaxy at a particular redshift, assuming…
The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and its Implications for Structure Growth
Frank J. Qu, Blake D. Sherwin, Mathew S. Madhavacheril +155
We present new measurements of cosmic microwave background (CMB) lensing over sq. deg. of the sky. These lensing measurements are derived from the Atacama Cosmology Telescop…
SuperCLASS -- III. Weak lensing from radio and optical observations in Data Release 1
Ian Harrison, Michael L. Brown, Ben Tunbridge +17
We describe the first results on weak gravitational lensing from the SuperCLASS survey: the first survey specifically designed to measure the weak lensing effect in radio-wavelengt…
SKA Engineering Change Proposal: Gridded Visibilities to Enable Precision Cosmology with Radio Weak Lensing
Ian Harrison, Michael L. Brown
This document was submitted as supporting material to an Engineering Change Proposal (ECP) for the Square Kilometre Array (SKA). This ECP requests gridded visibilities as an extra…
Exact Extreme Value Statistics and the Halo Mass Function
Ian Harrison, Peter Coles
Motivated by observations that suggest the presence of extremely massive clusters at uncomfortably high redshifts for the standard cosmological model to explain, we develop a theor…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Dwarf AGNs from Optical Variability for the Origins of Seeds (DAVOS): Insights from the Dark Energy Survey Deep Fields
Colin J. Burke, Xin Liu, Yue Shen +69
We present a sample of 706, active galactic nuclei (AGNs) selected from optical photometric variability in three of the Dark Energy Survey (DES) deep fields (E2, C3, and…
Cosmology Intertwined IV: The Age of the Universe and its Curvature
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +88
A precise measurement of the curvature of the Universe is of primeval importance for cosmology since it could not only confirm the paradigm of primordial inflation but also help in…
Source Distributions of Cosmic Shear Surveys in Efficiency Space
Nicolas Tessore, Ian Harrison
We show that the lensing efficiency of cosmic shear generically has a simple shape, even in the case of a tomographic survey with badly behaved photometric redshifts. We argue that…
Radio-Optical Galaxy Shape and Shear Correlations in the COSMOS Field using 3 GHz VLA Observations
Tom Hillier, Michael L. Brown, Ian Harrison +1
We present a weak lensing analysis of the 3 GHz VLA radio survey of the COSMOS field, which we correlate with overlapping HST-ACS optical observations using both intrinsic galaxy s…
The Tiered Radio Extragalactic Continuum Simulation (T-RECS)
Anna Bonaldi, Matteo Bonato, Vincenzo Galluzzi +5
We present the Tiered Radio Extragalactic Continuum Simulation (T-RECS): a new simulation of the radio sky in continuum, over the 150 MHz-20 GHz range. T-RECS models two main popul…
Advancing Astrophysics with the SKA II
Anna Bonaldi, Tyler L. Bourke, Philippa Hartley +45
Advancing Astrophysics with the SKA II (AASKAII), written by our science community, outlines the transformative scientific advances that will be enabled by the SKA telescopes. In t…
The Atacama Cosmology Telescope: DR6 Gravitational Lensing and SDSS BOSS cross-correlation measurement and constraints on gravity with the statistic
Lukas Wenzl, Rui An, Nick Battaglia +24
We derive new constraints on the statistic as a test of gravity, combining the CMB lensing map estimated from Data Release 6 (DR6) of the Atacama Cosmology Telescope with SDS…
Cosmology Intertwined III: and
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +89
The standard Cold Dark Matter cosmological model provides a wonderful fit to current cosmological data, but a few tensions and anomalies became statistically significant with…
SKA Weak Lensing II: Simulated Performance and Survey Design Considerations
Anna Bonaldi, Ian Harrison, Stefano Camera +1
We construct a pipeline for simulating weak lensing cosmology surveys with the Square Kilometre Array (SKA), taking as inputs telescope sensitivity curves; correlated source flux,…
The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models
Erminia Calabrese, J. Colin Hill, Hidde T. Jense +169
We use new cosmic microwave background (CMB) primary temperature and polarization anisotropy measurements from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) to test fo…
Weak Lensing with SKAO: Cosmic Shear Cosmology
Ian Harrison, Roberto Ingrao, Stefano Camera +4
We discuss the power of weak gravitational lensing surveys with the SKAO in constraining cosmological parameters and the properties of radio star-forming galaxy samples. As well as…
Weak Lensing with the SKAO: Radio Shear Measurement
Priyamvad Tripathi, Marzia Rivi, Simon Prunet +2
Cosmic shear measurements have traditionally been dominated by optical surveys, which offer higher resolution, better sensitivity, higher galaxy number density, and wider area cove…
HI Intensity Mapping for Clustering-Based Redshift Estimation
Steven Cunnington, Ian Harrison, Alkistis Pourtsidou +1
Precision cosmology requires accurate galaxy redshifts, but next generation optical surveys will observe unprecedented numbers of resolved galaxies, placing strain on the amount of…
LISA Pathfinder Platform Stability and Drag-free Performance
Michele Armano, Heather Audley, Jonathon Baird +75
The science operations of the LISA Pathfinder mission has demonstrated the feasibility of sub-femto-g free-fall of macroscopic test masses necessary to build a LISA-like gravitatio…
SKA Weak Lensing I: Cosmological Forecasts and the Power of Radio-Optical Cross-Correlations
Ian Harrison, Stefano Camera, Joe Zuntz +1
We construct forecasts for cosmological parameter constraints from weak gravitational lensing surveys involving the Square Kilometre Array (SKA). Considering matter content, dark e…