Large-scale structure observations

Percival, Will J.

doi:10.1093/acprof:oso/9780198728856.003.0007

Cited by 4 publications

(7 citation statements)

References 80 publications

(118 reference statements)

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“…For that, we recall that galaxies trace the distribution of dark matter in the universe so the galaxy overdensity also traces the matter overdensity. However, this tracing is subject to some subtle galaxy bias that can be non-local and nonlinear encoding various processes and physics of structure formation, see for example discussion in Percival (2013) and references therein. On large scales, it is often assumed that one has a linear bias defined via δ g (z, k) = b(z, k) δ m (z, k).…”

Section: Correlation Function and Matter Power Spectrummentioning

confidence: 99%

“…It turns out that these distortions are a rich source of cosmological information which has at its forefront the redshift space distortions (RSD) that are very sensitive to the growth rate of structure and the gravity theory governing such a growth. We briefly describe below some aspects of the RSD formalism and refer the reader to specialized reviews on the topic (Samushia et al 2014;Blake et al 2011a;Hamilton 1998;Percival and White 2009;Percival 2013) and references therein.…”

Section: Galaxy Surveys: Clustering and Redshift Space Distortions (Rsd)mentioning

confidence: 99%

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Testing general relativity in cosmology

2018

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We review recent developments and results in testing general relativity (GR) at cosmological scales. The subject has witnessed rapid growth during the last two decades with the aim of addressing the question of cosmic acceleration and the dark energy associated with it. However, with the advent of precision cosmology, it has also become a well-motivated endeavor by itself to test gravitational physics at cosmic scales. We overview cosmological probes of gravity, formalisms and parameterizations for testing deviations from GR at cosmological scales, selected modified gravity (MG) theories, gravitational screening mechanisms, and computer codes developed for these tests. We then provide summaries of recent cosmological constraints on MG parameters and selected MG models. We supplement these cosmological constraints with a summary of implications from the recent binary neutron star merger event. Next, we summarize some results on MG parameter forecasts with and without astrophysical systematics that will dominate the uncertainties. The review aims at providing an overall picture of the subject and an entry point to students and researchers interested in joining the field. It can also serve as a quick reference to recent results and constraints on testing gravity at cosmological scales.

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Section: Correlation Function and Matter Power Spectrummentioning

confidence: 99%

Section: Galaxy Surveys: Clustering and Redshift Space Distortions (Rsd)mentioning

confidence: 99%

Testing general relativity in cosmology

2018

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“…The maximum excursion from unity is ∼ 15% and is at non-linear scales (k ∼ 0.6h/Mpc). Modelling in detail the evolution bias goes beyond the scope of this paper, other works in the literature address this specifically e.g., Fry (1996); Tegmark & Peebles (1998); Hui & Parfrey (2008); Percival & Schäfer (2008). The issue of the correspondence of peaks to halos, although one of the main pillars of peak theory and other modelling approaches and one of the main assumptions used here, is not simple and straightforward.…”

Section: Quantifying Evolution Biasmentioning

confidence: 96%

The bias of weighted dark matter haloes from peak theory

Verde¹,

Jiménez²,

Simpson³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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We give an analytical form for the weighted correlation function of peaks in a Gaussian random field. In a cosmological context, this approach strictly describes the formation bias and is the main result here. Nevertheless, we show its validity and applicability to the evolved cosmological density field and halo field, using Gaussian random field realisations and dark matter N-body numerical simulations. Using this result from peak theory we compute the bias of peaks (and dark matter halos) and show that it reproduces results from the simulations at the O(10%) level. Our analytical formula for the bias predicts a scale-dependent bias with two characteristics: a broad band shape which, however, is most affected by the choice of weighting scheme and evolution bias, and a more robust, narrow feature localised at the BAO scale, an effect that is confirmed in simulations. This scale-dependent bias smooths the BAO feature but, conveniently, does not move it. We provide a simple analytic formula to describe this effect. We envision that our analytic solution will be of use for galaxy surveys that exploit galaxy clustering.

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“…As well as determining the evolution of the geometry of the universe in order to determine the equation of state of dark energy, eBOSS aims to make stronger tests of General Relativity on cosmological scales through redshift-space distortion measurements, look for evidence of non-Gaussianity in the primordial density field, and tighten the constraints on the sum of the masses of all neutrino species. The constraints that eBOSS is predicted to yield 85 on the comoving distance and the growth rate of structure as functions of redshift (assuming the Planck 87 ΛCDM model) are shown in Figure 7. ark Energy -future progress Weinberg+ (2013) (a) Percival (2013) (b) Figure 8. Current and predicted constraints from cosmological MOS surveys.…”

Section: Boss Constraints On Rsd and Modified Gravitymentioning

confidence: 99%

“…99 (b) The fractional error in constraints on the co-moving distance versus redshift relation, at various redshifts, from current and future MOS surveys. 100 eBOSS is currently the state of the art as far as MOS cosmological surveys are concerned. However there are, of course, plans afoot for even more potent MOS surveys providing still greater discrimination between cosmological models and yet higher precision in determining cosmological parameters.…”

Section: Boss Constraints On Rsd and Modified Gravitymentioning

confidence: 99%

Cosmological surveys with multi-object spectrographs

Colless

2016

SPIE Proceedings

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Multi-object spectroscopy has been a key technique contributing to the current era of 'precision cosmology'. From the first exploratory surveys of the large-scale structure and evolution of the universe to the current generation of superbly detailed maps spanning a wide range of redshifts, multi-object spectroscopy has been a fundamentally important tool for mapping the rich structure of the cosmic web and extracting cosmological information of increasing variety and precision. This will continue to be true for the foreseeable future, as we seek to map the evolving geometry and structure of the universe over the full extent of cosmic history in order to obtain the most precise and comprehensive measurements of cosmological parameters. Here I briefly summarize the contributions that multi-object spectroscopy has made to cosmology so far, then review the major surveys and instruments currently in play and their prospects for pushing back the cosmological frontier. Finally, I examine some of the next generation of instruments and surveys to explore how the field will develop in coming years, with a particular focus on specialised multi-object spectrographs for cosmology and the capabilities of multi-object spectrographs on the new generation of extremely large telescopes.

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Large-scale structure observations

Abstract: Galaxy Surveys are enjoying a renaissance thanks to the advent of multi-object spectrographs on ground-based telescopes.

Cited by 4 publications

References 80 publications

Testing general relativity in cosmology

Testing general relativity in cosmology

The bias of weighted dark matter haloes from peak theory

Cosmological surveys with multi-object spectrographs

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