Cosmological leverage from the matter power spectrum in the presence of baryon and nonlinear effects

Bielefeld, Jannis; Huterer, Dragan; Linder, Eric V.

doi:10.1088/1475-7516/2015/05/023

Cited by 9 publications

(10 citation statements)

References 38 publications

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“…Many different approaches to parameterizing the scale dependence (e.g. Bielefeld et al 2015) and redshift dependence (e.g. Fry 1996;Matarrese et al 1997;Clerkin et al 2015) of the bias have been proposed in the literature.…”

Section: Bias Modelmentioning

confidence: 99%

Joint measurement of lensing–galaxy correlations using SPT and DES SV data

Baxter

Clampitt

Giannantonio

et al. 2016

Mon. Not. R. Astron. Soc.

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We measure the correlation of galaxy lensing and cosmic microwave background lensing with a set of galaxies expected to trace the matter density field. The measurements are performed using pre-survey Dark Energy Survey (DES) Science Verification optical imaging data and millimeter-wave data from the 2500 square degree South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey. The two lensing-galaxy correlations are jointly fit to extract constraints on cosmological parameters, constraints on the redshift distribution of the lens galaxies, and constraints on the absolute shear calibration of DES galaxy lensing measurements. We show that an attractive feature of these fits is that they are fairly insensitive to the clustering bias of the galaxies used as matter tracers. The measurement presented in this work confirms that DES and SPT data are consistent with each other and with the currently favored ΛCDM cosmological model. It also demonstrates that joint lensing-galaxy correlation measurement considered here contains a wealth of information that can be extracted using current and future surveys.

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Section: Bias Modelmentioning

confidence: 99%

Joint measurement of lensing–galaxy correlations using SPT and DES SV data

Baxter

Clampitt

Giannantonio

et al. 2016

Mon. Not. R. Astron. Soc.

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“…via gravitational lensing) will be key to achieve sufficient understanding of the small-scale clustering. As in the case of large-scale systematics, self-calibration via flexible modeling of the remaining systematics [208,209], and projecting out information that is affected by the systematics while keeping the bulk of the cosmological information [102,206,210], can both be very effective.…”

Section: Observational Systematicsmentioning

confidence: 99%

Testing Inflation with Large Scale Structure: Connecting Hopes with Reality

Alvarez

Putter²,

Baldauf

et al. 2014

Self Cite

135

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The statistics of primordial curvature fluctuations are our window into the period of inflation, where these fluctuations were generated. To date, the cosmic microwave background has been the dominant source of information about these perturbations. Large scale structure is however from where drastic improvements should originate. In this paper, we explain the theoretical motivations for pursuing such measurements and the challenges that lie ahead. In particular, we discuss and identify theoretical targets regarding the measurement of primordial non-Gaussianity. We argue that when quantified in terms of the local (equilateral) template amplitude f loc NL (f eq NL ), natural target levels of sensitivity are ∆f loc,eq. NL 1. We highlight that such levels are within reach of future surveys by measuring 2-, 3-and 4-point statistics of the galaxy spatial distribution. This paper summarizes a workshop held at CITA (University of Toronto) on October 23-24, 2014 [Link]. BNL-1124147-2014-IR Contents 4 Beyond the Halo Power Spectrum 4.1 State of Bispectrum Observations 4.

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“…While we have the tools to investigate the standard model, the next challenge is to be able to compare those data with cosmologies that go beyond General Relativity, in order to test whether a fluid component like Dark Energy or similarly a Modified Gravity scenario can better fit the data. On the theoretical side, while many Modified Gravity models are still allowed by type Ia supernova (SNIa) and Cosmic Microwave Background (CMB) data [1]; structure formation can help us to distinguish among them and the standard scenario, thanks to their signatures on the matter power spectrum, in the linear and mildly non-linear regimes (for some examples of forecasts, see [2][3][4]).…”

mentioning

confidence: 99%

Linear and non-linear Modified Gravity forecasts with future surveys

Casas

Kunz

Martinelli

et al. 2017

Physics of the Dark Universe

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Modified Gravity theories generally affect the Poisson equation and the gravitational slip (effective anisotropic stress) in an observable way, that can be parameterized by two generic functions (η and µ) of time and space. We bin the time dependence of these functions in redshift and present forecasts on each bin for future surveys like Euclid. We consider both Galaxy Clustering and Weak Lensing surveys, showing the impact of the non-linear regime, treated with two different semi-analytical approximations. In addition to these future observables, we use a prior covariance matrix derived from the Planck observations of the Cosmic Microwave Background. Our results show that η and µ in different redshift bins are significantly correlated, but including non-linear scales reduces or even eliminates the correlation, breaking the degeneracy between Modified Gravity parameters and the overall amplitude of the matter power spectrum. We further decorrelate parameters with a Zerophase Component Analysis and identify which combinations of the Modified Gravity parameter amplitudes, in different redshift bins, are best constrained by future surveys. We also extend the analysis to two particular parameterizations of the time evolution of µ and η and consider, in addition to Euclid, also SKA1, SKA2, DESI: we find in this case that future surveys will be able to constrain the current values of η and µ at the 2-5% level when using only linear scales (wavevector k < 0.15 h/Mpc), depending on the specific time parameterization; sensitivity improves to about 1% when non-linearities are included. CONTENTS

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Cosmological leverage from the matter power spectrum in the presence of baryon and nonlinear effects

Cited by 9 publications

References 38 publications

Joint measurement of lensing–galaxy correlations using SPT and DES SV data

Joint measurement of lensing–galaxy correlations using SPT and DES SV data

Testing Inflation with Large Scale Structure: Connecting Hopes with Reality

Linear and non-linear Modified Gravity forecasts with future surveys

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