1.5k citations · 4.7k across the 73 of their papers we have counts for
73 papers
Euclid preparation. Review of forecast constraints on dark energy and modified gravity
Euclid Collaboration, N. Frusciante, M. Martinelli +326
The Euclid mission has been designed to provide, as one of its main deliverables, information on the nature of the gravitational interaction, which determines the expansion of the…
Non-linear structure formation with elastic interactions in the dark sector
Jose Beltrán Jiménez, David Figueruelo, David F. Mota +1
Cosmological models where dark matter interacts with dark energy via a pure momentum transfer and with no energy exchange (i.e. elastic) provide compelling scenarios for addressing…
Emulating the Non-Linear Matter Power-Spectrum in Mixed Axion Dark Matter Models
Dennis Fremstad, Hans A. Winther
In order to constrain ultra light dark matter models with current and near future weak lensing surveys we need the predictions for the non-linear dark matter power-spectrum. This i…
Fast Generation of Weak Lensing Maps in Modified Gravity with COLA
Sophie Hoyland, Hans A. Winther, Daniela Saadeh +2
Accurate predictions of weak lensing observables are essential for understanding the large-scale structure of the Universe and probing the nature of gravity. In this work, we prese…
Interference in Fuzzy Dark Matter Filaments: Idealised Models and Statistics
Tim Zimmermann, David J. E. Marsh, Keir K. Rogers +2
Fuzzy (wave) dark matter (FDM), the dynamical model underlying an ultralight bosonic dark matter species, produces a rich set of non-gravitational signatures that distinguishes it…
Euclid preparation. Simulations and nonlinearities beyond CDM. 1. Numerical methods and validation
Euclid Collaboration, J. Adamek, B. Fiorini +268
To constrain models beyond CDM, the development of the Euclid analysis pipeline requires simulations that capture the nonlinear phenomenology of such models. We present an overv…
Euclid preparation LXXI. Simulations and nonlinearities beyond CDM. 3. Constraints on models from the photometric primary probes
Euclid Collaboration, K. Koyama, S. Pamuk +275
We study the constraint on gravity that can be obtained by photometric primary probes of the Euclid mission. Our focus is the dependence of the constraint on the theoretical…
Euclid preparation LXIII. Simulations and nonlinearities beyond CDM. 2. Results from non-standard simulations
Euclid Collaboration, G. Rácz, M. -A. Breton +275
The Euclid mission will measure cosmological parameters with unprecedented precision. To distinguish between cosmological models, it is essential to generate realistic mock observa…
Alcock-Paczyński effect on void-finding: Implications for void-galaxy cross-correlation modelling
Slađana Radinović, Hans A. Winther, Seshadri Nadathur +5
Under the assumption of statistical isotropy, and in the absence of directional selection effects, a stack of voids is expected to be spherically symmetric, which makes it an excel…
Modelling the BOSS void-galaxy cross-correlation function using a neural-network emulator
Tristan S. Fraser, Enrique Paillas, Will J. Percival +3
We introduce an emulator-based method to model the cross-correlation between cosmological voids and galaxies. This allows us to model the effect of cosmology on void finding and on…
Modeling nonlinear scales with COLA: preparing for LSST-Y1
Jonathan Gordon, Bernardo F. de Aguiar, João Rebouças +5
Year 1 results of the Legacy Survey of Space and Time (LSST) will provide tighter constraints on small-scale cosmology, beyond the validity of linear perturbation theory. This heig…
A simple prediction of the nonlinear matter power spectrum in Brans-Dicke gravity from linear theory
Herman Sletmoen, Hans A. Winther
Brans-Dicke (BD), one of the first proposed scalar-tensor theories of gravity, effectively makes the gravitational constant of general relativity (GR) time-dependent. Constraints o…
Euclid: The search for primordial features
M. Ballardini, Y. Akrami, F. Finelli +126
Primordial features, in particular oscillatory signals, imprinted in the primordial power spectrum of density perturbations represent a clear window of opportunity for detecting ne…
Sesame: A power spectrum emulator pipeline for beyond-CDM models
Renate Mauland, Hans A. Winther, Cheng-Zong Ruan
The mysterious nature of the dark sector of the CDM model is one of the main motivators behind the study of alternative cosmological models. A central quantity of interest for t…
Euclid: Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes
N. Frusciante, F. Pace, V. F. Cardone +127
The future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications to Einstein's general relativity at cosmic scales. We focus on modified gr…
Revisiting Vainshtein Screening for fast N-body simulations
Guilherme Brando, Kazuya Koyama, Hans A. Winther
We revisit a method to incorporate the Vainshtein screening mechanism in N-body simulations proposed by R. Scoccimarro in~\cite{Scoccimarro:2009eu}. We further extend this method t…
Cosmological measurements from void-galaxy and galaxy-galaxy clustering in the Sloan Digital Sky Survey
Alex Woodfinden, Will J. Percival, Seshadri Nadathur +5
We present the cosmological implications of measurements of void-galaxy and galaxy-galaxy clustering from the Sloan Digital Sky Survey (SDSS) Main Galaxy Sample (MGS), Baryon Oscil…
Euclid: Cosmology forecasts from the void-galaxy cross-correlation function with reconstruction
S. Radinović, S. Nadathur, H. -A. Winther +118
We investigate the cosmological constraints that can be expected from measurement of the cross-correlation of galaxies with cosmic voids identified in the Euclid spectroscopic surv…
Euclid: Modelling massive neutrinos in cosmology -- a code comparison
J. Adamek, R. E. Angulo, C. Arnold +133
The measurement of the absolute neutrino mass scale from cosmological large-scale clustering data is one of the key science goals of the Euclid mission. Such a measurement relies o…
Testing modified gravity scenarios with direct peculiar velocities
Stuart Lyall, Chris Blake, Ryan Turner +2
The theoretical basis of dark energy remains unknown and could signify a need to modify the laws of gravity on cosmological scales. In this study we investigate how the clustering…
Velocity profiles of matter and biased tracers around voids
Elena Massara, Will J. Percival, Neal Dalal +4
The velocity profile of galaxies around voids is a key ingredient for redshift space distortion (RSD) measurements made using the void-galaxy correlation function. In this paper we…
Measurements of cosmic expansion and growth rate of structure from voids in the Sloan Digital Sky Survey between redshift 0.07 and 1.0
Alex Woodfinden, Seshadri Nadathur, Will J. Percival +3
We present measurements of the anisotropic cross-correlation of galaxies and cosmic voids in data from the Sloan Digital Sky Survey Main Galaxy Sample (MGS), Baryon Oscillation Spe…
Cosmological simulations of self-interacting Bose-Einstein condensate dark matter
S. T. H. Hartman, H. A. Winther, D. F. Mota
Fully 3D cosmological simulations of scalar field dark matter with self-interactions, also known as Bose-Einstein condensate dark matter, are performed using a set of effective hyd…
Enabling matter power spectrum emulation in beyond-CDM cosmologies with COLA
Guilherme Brando, Bartolomeo Fiorini, Kazuya Koyama +1
We compare and validate COLA (COmoving Lagrangian Acceleration) simulations against existing emulators in the literature, namely Bacco and Euclid Emulator 2. Our analysis focuses o…