Measuring redshift-space distortions with future SKA surveys

Raccanelli, Alvise; Bull, Philip; Camera, Stefano; Bacon, David; Blake, Chris; Doré, O.; Ferreira, P. Castelo; Maartens, Roy; Santos, Mário G.; Viel, Matteo; Zhao, Gong-Bo

doi:10.48550/arxiv.1501.03821

Cited by 17 publications

(38 citation statements)

References 12 publications

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“…Common to all PDFs is that they are clustered around the fiducial ΛCDM case (by construction) and deviate from it by no more than 2%. Such deviations fall within the reach of completed surveys like BOSS [50] and the projected sensitivities of galaxy redshift surveys by WFIRST [51], SKA [52,53], and SPHEREx [54]. In the next section we explore this sensitivity and derive constraints from existing observations.…”

Section: Predictions For Quintessence Observablesmentioning

confidence: 83%

“…Assuming a fiducial Planck ΛCDM cosmology, we also determine how future galaxy surveys could improve on those constraints, by performing a standard Fisher forecast [67] of the errors on the observed galaxy power spectrum (at z = 0.57) for the proposed SPHEREx satellite [54] and the Square Kilometre Array (SKA) [52,53] (at z = 1). These results are obtained from a standard BAO forecast prescription [68] and are shown in the bottom panel of Fig.…”

Section: Constraints From the Baryon-photon Sound Horizonmentioning

confidence: 99%

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Cosmological tests of an axiverse-inspired quintessence field

et al. 2016

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Inspired by the string axiverse idea, it has been suggested that the recent transition from decelerated to accelerated cosmic expansion is driven by an axion-like quintessence field with a subPlanckian decay constant. The scenario requires that the axion field be rather near the maximum of its potential, but is less finely tuned than other explanations of cosmic acceleration. The model is parametrized by an axion decay constant f , the axion mass m, and an initial misalignment angle |θi| which is close to π. In order to determine the m and θi values consistent with observations, these parameters are mapped onto observables: the Hubble parameter H(z) at an angular diameter distance dA(z) to redshift z = 0.57, as well as the angular sound horizon of the cosmic microwave background (CMB). Measurements of the baryon acoustic oscillation (BAO) scale at z 0.57 by the BOSS survey and Planck measurements of CMB temperature anisotropies are then used to probe the {m, f, θi} parameter space. With current data, CMB constraints are the most powerful, allowing a fraction of only ∼ 0.2 of the parameter-space volume. Measurements of the BAO scale made using the SPHEREx or SKA experiments could go further, observationally distinguishing all but ∼ 10 −2 or ∼ 10 −5 of the parameter-space volume (allowed by simple priors) from the ΛCDM model. PACS numbers: 95.36.+x,14.80.Va,98.70.Vc,95.80.+p

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Section: Predictions For Quintessence Observablesmentioning

confidence: 83%

Section: Constraints From the Baryon-photon Sound Horizonmentioning

confidence: 99%

Cosmological tests of an axiverse-inspired quintessence field

et al. 2016

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“…While comparing the observations with predictions from different cosmological models, it is important to account for the fact that the fiducial model will, in general, be different from the cosmological model under consideration. In such a case, the observed 21 cm power spectrum will be given by [44][45][46]…”

Section: Observed 21 CM Power Spectrummentioning

confidence: 99%

Dark energy constraints from the 21~cm intensity mapping surveys with SKA1

Dinda,

Sen,

Choudhury

2018

Preprint

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Understanding the nature of dark energy is one of the most outstanding problems in cosmology at present. In last twenty years, cosmological observations related to SNIa, Cosmic Microwave Background Radiation, Baryon Acoustic Oscillations etc, have put stringent constraints on the the dark energy evolution, still there is enough uncertainty in our knowledge about dark energy that demands new generation of cosmological observations. Post-reionization neutral hydrogen 21 cm intensity mapping surveys are one of the most promising future cosmological observations that have the potential to map the cosmological evolution from dark ages till present time with unprecedented accuracy and Square Kilometer Array (SKA) is one of the most sensitive instruments to measure the post-reionization 21 cm signal. In this work, we study the future dark energy constraints using postreionization 21 cm intensity mapping power spectra with SKA1-mid specifications. We use three different parametrizations for dark energy equation of state (EoS) including the widely used CPL one. To generate simulated data, we use to two fiducial models: the concordance ΛCDM and the best fit CPL model for Planck+SNIa+BAO+HST. Our study shows that SKA1-mid alone has the potential to reach the present accuracy for combined Planck+SNIa+BAO+HST to constrain the dark energy behaviour. Whether dark energy is phantom or non-phantom or whether it exhibits phantom crossing, we may potentially address such questions with SKA1-mid. We also show that it is crucial to choose the correct parametrization for dark energy equation of state as some parametrizations are better than others to constrain the dark energy behaviour. Specifically, as observed in this study, the widely used CPL parametrization may not give the best constraint for dark energy behaviour.

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“…Such quantities could be constrained in the near future with large scale surveys such as the SKA, using, e.g. redshift space distortion [102][103][104].…”

Section: Discussionmentioning

confidence: 99%

Test of the Equivalence Principle in the Dark sector on galactic scales

Mohapi¹,

Hees²,

Larena³

2016

J. Cosmol. Astropart. Phys.

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Abstract. The Einstein Equivalence Principle is a fundamental principle of the theory of General Relativity. While this principle has been thoroughly tested with standard matter, the question of its validity in the Dark sector remains open. In this paper, we consider a general tensor-scalar theory that allows to test the equivalence principle in the Dark sector by introducing two different conformal couplings to standard matter and to Dark matter. We constrain these couplings by considering galactic observations of strong lensing and of velocity dispersion. Our analysis shows that, in the case of a violation of the Einstein Equivalence Principle, data favour violations through coupling strengths that are of opposite signs for ordinary and Dark matter. At the same time, our analysis does not show any significant deviations from General Relativity.

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Measuring redshift-space distortions with future SKA surveys

Cited by 17 publications

References 12 publications

Cosmological tests of an axiverse-inspired quintessence field

Cosmological tests of an axiverse-inspired quintessence field

Dark energy constraints from the 21~cm intensity mapping surveys with SKA1

Test of the Equivalence Principle in the Dark sector on galactic scales

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