695 citations · 7k across the 122 of their papers we have counts for
81 papers · 1 filter
Statistical Field Theory for Weak Gravitational Lensing
Zheng Zhang, Philip Bull, Chris Clarkson +1
Standard weak-lensing calculations treat lensing as a linear remapping of the matter field along the line of sight. We instead formulate lensing as a stochastic field theory for th…
The observer power spectrum for lightcone statistics, integrated relativistic observables and wide angle effects
Chris Clarkson, Pritha Paul
The statistics of large-scale structure are naturally described by power spectra in Fourier space. For fields on spatial hypersurfaces, translational invariance makes different Fou…
Multi-tracer power spectra and bispectra: Formalism
Dionysios Karagiannis, Roy Maartens, José Fonseca +2
The power spectrum and bispectrum of dark matter tracers are key and complementary probes of the Universe. Next-generation surveys will deliver good measurements of the bispectrum,…
The observed number counts in luminosity distance space
José Fonseca, Stefano Zazzera, Tessa Baker +1
Next generation surveys will provide us with an unprecedented number of detections of supernovae Type Ia and gravitational wave merger events. Cross-correlations of such objects of…
Theoretical systematics in testing the Cosmological Principle with the kinematic quasar dipole
Caroline Guandalin, Jade Piat, Chris Clarkson +1
The Cosmological Principle is part of the foundation that underpins the standard model of the Universe. In the era of precision cosmology, when stress tests of the standard model a…
Wide-angle effects in multi-tracer power spectra with Doppler corrections
Pritha Paul, Chris Clarkson, Roy Maartens
We examine the computation of wide-angle corrections to the galaxy power spectrum including redshift-space distortions and relativistic Doppler corrections, and also including mult…
Euclid: Testing the Copernican principle with next-generation surveys
D. Camarena, V. Marra, Z. Sakr +112
The Copernican principle, the notion that we are not at a special location in the Universe, is one of the cornerstones of modern cosmology and its violation would invalidate the Fr…
Measuring dark energy with expansion and growth
Louis Perenon, Matteo Martinelli, Roy Maartens +2
We combine cosmic chronometer and growth of structure data to derive the redshift evolution of the dark energy equation of state , using a novel agnostic approach. The backgroun…
A void in the Hubble tension? The end of the line for the Hubble bubble
David Camarena, Valerio Marra, Ziad Sakr +1
The Universe may feature large-scale inhomogeneities beyond the standard paradigm, implying that statistical homogeneity and isotropy may be reached only on much larger scales than…
Euclid: Forecast constraints on consistency tests of the CDM model
S. Nesseris, D. Sapone, M. Martinelli +112
The standard cosmological model is based on the fundamental assumptions of a spatially homogeneous and isotropic universe on large scales. An observational detection of a violation…
Magnification and evolution biases in large-scale structure surveys
Roy Maartens, José Fonseca, Stefano Camera +3
Measurements of galaxy clustering in upcoming surveys such as those planned for the Euclid and Roman satellites, and the SKA Observatory, will be sensitive to distortions from lens…
Anti-symmetric clustering signals in the observed power spectrum
José Fonseca, Chris Clarkson
In this paper, we study how to directly measure the effect of peculiar velocities in the observed angular power spectra. We do this by constructing a new anti-symmetric estimator o…
The Copernican principle in light of the latest cosmological data
David Camarena, Valerio Marra, Ziad Sakr +1
We pursue a program to confront observations with inhomogeneous extensions of the FLRW metric. The main idea is to test the Copernican principle rather than assuming it a priori. W…
Multi-tasking the growth of cosmological structures
Louis Perenon, Matteo Martinelli, Stéphane Ilić +3
Next-generation large-scale structure surveys will deliver a significant increase in the precision of growth data, allowing us to use `agnostic' methods to study the evolution of p…
Local primordial non-Gaussianity in the relativistic galaxy bispectrum
Roy Maartens, Sheean Jolicoeur, Obinna Umeh +2
Next-generation galaxy and 21cm intensity mapping surveys will rely on a combination of the power spectrum and bispectrum for high-precision measurements of primordial non-Gaussian…
Observing relativistic features in large-scale structure surveys -- II: Doppler magnification in an ensemble of relativistic simulations
Louis Coates, Julian Adamek, Philip Bull +2
The standard cosmological model is inherently relativistic, and yet a wide range of cosmological observations can be predicted accurately from essentially Newtonian theory. This is…
Detecting the relativistic bispectrum in 21cm intensity maps
Sheean Jolicoeur, Roy Maartens, Eline M. De Weerd +3
We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and o…
Observing relativistic features in large-scale structure surveys -- I: Multipoles of the power spectrum
Caroline Guandalin, Julian Adamek, Philip Bull +3
Planned efforts to probe the largest observable distance scales in future cosmological surveys are motivated by a desire to detect relic correlations left over from inflation, and…
Null tests of the concordance model in the era of Euclid and the SKA
Carlos A. P. Bengaly, Chris Clarkson, Martin Kunz +1
We perform null tests of the concordance model, using measurements that mimic next-generation surveys such as Euclid and the SKA. To this end, we deploy a non-parametric met…
Weak-lensing observables in relativistic N-body simulations
Francesca Lepori, Julian Adamek, Ruth Durrer +2
We present a numerical weak-lensing analysis that is fully relativistic and non-perturbative for the scalar part of the gravitational potential and first-order in the vector part,…
Multipoles of the relativistic galaxy bispectrum
Eline M. de Weerd, Chris Clarkson, Sheean Jolicoeur +2
Above the equality scale the galaxy bispectrum will be a key probe for measuring primordial non-Gaussianity which can help differentiate between different inflationary models and o…
Detecting the relativistic galaxy bispectrum
Roy Maartens, Sheean Jolicoeur, Obinna Umeh +3
The Fourier-space galaxy bispectrum is complex, with the imaginary part arising from leading-order relativistic corrections, due to Doppler, gravitational redshift and related line…
A null test to probe the scale-dependence of the growth of structure as a test of General Relativity
Felipe Oliveira Franco, Camille Bonvin, Chris Clarkson
The main science driver for the coming generation of cosmological surveys is understanding dark energy which relies on testing General Relativity on the largest scales. Once we mov…
Probing beyond-Horndeski gravity on ultra-large scales
Didam Duniya, Teboho Moloi, Chris Clarkson +4
The beyond-Horndeski gravity has recently been reformulated in the dark energy paradigm - which has been dubbed, Unified Dark Energy (UDE). The evolution equations for the given UD…