ORCID Profile
0000-0002-5318-4064
Current Organisation
Geneva University
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Publisher: American Astronomical Society
Date: 12-05-2015
Publisher: Oxford University Press (OUP)
Date: 13-07-2020
Abstract: We show that correlations between the phases of the galaxy density field in redshift space provide additional information about the growth rate of large-scale structure that is complementary to the power-spectrum multipoles. In particular, we consider the multipoles of the line correlation function (LCF), which correlates phases between three collinear points, and use the Fisher forecasting method to show that the LCF multipoles can break the degeneracy between the measurement of the growth rate of structure f and the litude of perturbations σ8 that is present in the power-spectrum multipoles at large scales. This leads to an improvement in the measurement of f and σ8 by up to 220 per cent for $k_{\\rm max} = 0.15 \\, h\\, \\mathrm{Mpc}^{-1}$ and up to 50 per cent for $k_{\\rm max} = 0.30 \\, h\\, \\mathrm{Mpc}^{-1}$ at redshift z = 0.25, with respect to power-spectrum measurements alone for the upcoming generation of galaxy surveys like DESI and Euclid. The average improvements in the constraints on f and σ8 for $k_{\\rm max} = 0.15 \\, h\\, \\mathrm{Mpc}^{-1}$ are ∼90 per cent for the DESI BGS s le with mean redshift $\\overline{z}=0.25$, ∼40 per cent for the DESI ELG s le with $\\overline{z}=1.25$, and ∼40 per cent for the Euclid Hα galaxies with $\\overline{z}=1.3$. For $k_{\\rm max} = 0.30 \\, h\\, \\mathrm{Mpc}^{-1}$, the average improvements are ∼40 per cent for the DESI BGS s le and ∼20 per cent for both the DESI ELG and Euclid Hα galaxies.
Publisher: Oxford University Press (OUP)
Date: 28-06-2018
Publisher: Cambridge University Press (CUP)
Date: 2020
DOI: 10.1017/PASA.2019.51
Abstract: We present a detailed overview of the cosmological surveys that we aim to carry out with Phase 1 of the Square Kilometre Array (SKA1) and the science that they will enable. We highlight three main surveys: a medium-deep continuum weak lensing and low-redshift spectroscopic HI galaxy survey over 5 000 deg 2 a wide and deep continuum galaxy and HI intensity mapping (IM) survey over 20 000 deg 2 from $z = 0.35$ to 3 and a deep, high-redshift HI IM survey over 100 deg 2 from $z = 3$ to 6. Taken together, these surveys will achieve an array of important scientific goals: measuring the equation of state of dark energy out to $z \\sim 3$ with percent-level precision measurements of the cosmic expansion rate constraining possible deviations from General Relativity on cosmological scales by measuring the growth rate of structure through multiple independent methods mapping the structure of the Universe on the largest accessible scales, thus constraining fundamental properties such as isotropy, homogeneity, and non-Gaussianity and measuring the HI density and bias out to $z = 6$ . These surveys will also provide highly complementary clustering and weak lensing measurements that have independent systematic uncertainties to those of optical and near-infrared (NIR) surveys like Euclid , LSST, and WFIRST leading to a multitude of synergies that can improve constraints significantly beyond what optical or radio surveys can achieve on their own. This document, the 2018 Red Book , provides reference technical specifications, cosmological parameter forecasts, and an overview of relevant systematic effects for the three key surveys and will be regularly updated by the Cosmology Science Working Group in the run up to start of operations and the Key Science Programme of SKA1.
Publisher: American Physical Society (APS)
Date: 24-05-2019
Publisher: Cambridge University Press (CUP)
Date: 2020
DOI: 10.1017/PASA.2019.42
Abstract: The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over a wide range of frequencies, and with an order of magnitude greater sensitivity and survey speed than any current radio telescope. The SKA will address many important topics in astronomy, ranging from planet formation to distant galaxies. However, in this work, we consider the perspective of the SKA as a facility for studying physics. We review four areas in which the SKA is expected to make major contributions to our understanding of fundamental physics: cosmic dawn and reionisation gravity and gravitational radiation cosmology and dark energy and dark matter and astroparticle physics. These discussions demonstrate that the SKA will be a spectacular physics machine, which will provide many new breakthroughs and novel insights on matter, energy, and spacetime.
Publisher: American Astronomical Society
Date: 20-12-2013
No related grants have been discovered for Camille Bonvin.