Cosmology and Nongalactic Astrophysics · arXiv:1810.06672 v2 · submitted 15 Oct 2018
Probing ΛCDM cosmology with the Evolutionary Map of the Universe survey
The paper says
“We find that EMU could measure the dark energy equation of state parameters around 35% more precisely than existing constraints, and that the constraints on $f_{\rm NL}$ and modified gravity parameters will improve up to a factor ∼ 2 with respect to Planck and redshift space distortions measurements.”
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The paper
Abstract
The Evolutionary Map of the Universe (EMU) is an all-sky survey in radio-continuum which uses the Australian SKA Pathfinder (ASKAP). Using galaxy angular power spectrum and the integrated Sachs-Wolfe effect, we study the potential of EMU to constrain models beyond ΛCDM (i.e., local primordial non-Gaussianity, dynamical dark energy, spatial curvature and deviations from general relativity), for different design sensitivities. We also include a multi-tracer analysis, distinguishing between star-forming galaxies and galaxies with an active galactic nucleus, to further improve EMU's potential. We find that EMU could measure the dark energy equation of state parameters around 35% more precisely than existing constraints, and that the constraints on $f_{\rm NL}$ and modified gravity parameters will improve up to a factor ∼ 2 with respect to Planck and redshift space distortions measurements. With this work we demonstrate the promising potential of EMU to contribute to our understanding of the Universe.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: hedged possibility 0.76
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.09 · human participants 0.02 · controlled comparison 0.28 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.94 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v2). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| The Evolutionary Map of the Universe (EMU) is an all-sky survey in radio-continuum which uses the Australian SKA Pathfinder (ASKAP). | background 0.75 | 0.10 | 0.01 | asserted 1.00 |
| Using galaxy angular power spectrum and the integrated Sachs-Wolfe effect, we study the potential of EMU to constrain models beyond $\Lambda$CDM (i.e., local primordial non-Gaussianity, dynamical dark energy, spatial curvature and deviations from general relativity), for different design sensitivities. | contribution 0.74 | 0.85 | 0.05 | asserted 0.59 |
| We also include a multi-tracer analysis, distinguishing between star-forming galaxies and galaxies with an active galactic nucleus, to further improve EMU's potential. | method 0.86 | 0.85 | 0.03 | asserted 0.92 |
| We find that EMU could measure the dark energy equation of state parameters around 35\% more precisely than existing constraints, and that the constraints on $f_{\rm NL}$ and modified gravity parameters will improve up to a factor $\sim2$ with respect to Planck and redshift space distortions measurements. | result 1.00 | 0.96 | 0.83 | hedged possibility 0.76 |
| With this work we demonstrate the promising potential of EMU to contribute to our understanding of the Universe. | interpretation 0.95 | 0.73 | 0.26 | asserted 0.98 |
What kind of paper the classifier reports this is: simulation study 0.51 · evidence from simulation or computation 0.93
What was examined, and what was not
Sources read
- arXiv listing abstract v2
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
Not run
- S sections
- T body sentences
- C citations
- R cross-paper relations
How the labels were made
Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,462 input tokens.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 4 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- The galaxy power spectrum take on spatial curvature and cosmic concordance astro-ph.CO · Oct 2020
- Beware of commonly used approximations I: errors in forecasts astro-ph.CO · May 2020
- Beware of commonly used approximations II: estimating systematic biases in the best-fit parameters astro-ph.CO · May 2020
- Robustness of baryon acoustic oscillation constraints for early-Universe modifications to $\Lambda$CDM astro-ph.CO · Apr 2020
How the literature uses it
7 arXiv papers cite this in 11 sentences
Papers citing it · 5 sentences without a confident label
Uses its method or tool 1 paper
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Hence, we adopt a more conservative choice for the tomography and divide EMU and SKA1 in 5 broad bins in redshift as in [ref] .
Cosmological parameter forecasts by a joint 2D tomographic approach to CMB and galaxy clustering · Radio continuum galaxy surveys · 0.94
Uses its data or values 1 paper
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For the bias of mAGN, we use the same as in Ref. [ref] .
Cross Correlating the Unresolved Gamma-Ray Background with Cosmic Large-Scale Structure from DESI: Implications for Astrophysics and Dark Matter · Misaligned AGN · 0.97
Cites it as background 2 papers
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The fact that significant efforts have been devoted towards constraining spatial curvature (hereafter simply “curvature”) from cosmological observations and forecasting the achievable precision on such constraints from future observations (see e.g. [ref] for an inevitably incomplete list) should therefore come as no surprise.
The galaxy power spectrum take on spatial curvature and cosmic concordance · Introduction · 0.89
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Additional physics related to large modifications of the scale dependence of the clustering can be strongly constrained, such as suppression at small scales (see e.g., [ref] and references therein) or primordial non-Gaussianities (see e.g., [ref] ).
Robustness of baryon acoustic oscillation constraints for early-Universe modifications to $\Lambda$CDM · Introduction · 0.80
What it cites · 37 sentences without a confident label
Uses the method or tool of 15 papers
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We use the Tiered Radio Extragalactic Continuum Simulation (T-RECS) [ref] to estimate the galaxy number density distribution as a function of redshift of both star forming galaxies (SFG) and galaxies with active galactic nucleus (AGN) and the corresponding galaxy and magnification biases.
The Tiered Radio Extragalactic Continuum Simulation (T-RECS) · EMU · 0.92
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In order to forecast the constraining power of EMU for the models discussed above, we use the Fisher matrix analysis [ref] .
Karhunen-Loeve eigenvalue problems in cosmology: how should we tackle large data sets? · Fisher matrix formalism · 0.99
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Besides considering the whole sample altogether, we also take advantage of the expected broad distribution of sources in redshift and the potential of machine-learning redshift measurements (e.g. [ref] ) and clustering-based redshifts obtained by cross correlating EMU's sample with spectroscopic catalogues [ref] (whose performance in cosmological surveys was estimated in [ref] ).
Preliminary results of using k-Nearest Neighbours Regression to estimate the redshift of radio selected datasets · Introduction · 0.85
Uses data or values from 5 papers
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In order to estimate the combined constraints with current observations, we add priors from the temperature, polarization and lensing CMB power spectra from Planck [ref] , combined with BAO observations from spectroscopic galaxy surveys [ref] (except for $Λ$CDM+$μ_0$+$γ_0$, for which we use the constraints from Planck+BAO+RSD, as done in [ref] ).
The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant · Results · 1.00
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In order to estimate the combined constraints with current observations, we add priors from the temperature, polarization and lensing CMB power spectra from Planck [ref] , combined with BAO observations from spectroscopic galaxy surveys [ref] (except for $Λ$CDM+$μ_0$+$γ_0$, for which we use the constraints from Planck+BAO+RSD, as done in [ref] ).
The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15 · Results · 1.00
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In order to estimate the combined constraints with current observations, we add priors from the temperature, polarization and lensing CMB power spectra from Planck [ref] , combined with BAO observations from spectroscopic galaxy surveys [ref] (except for $Λ$CDM+$μ_0$+$γ_0$, for which we use the constraints from Planck+BAO+RSD, as done in [ref] ).
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample · Results · 1.00
Compares with 1 paper
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This result is consistent with the findings reported for the SKA Phase 1 [ref] .
Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts · Conclusions · 0.91
Cites as support 2 papers
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However, we do observe a significant cross correlation due to lensing contributions [ref] .
Lensing and time-delay contributions to galaxy correlations · Cosmological observables · 0.97
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Moreover, consistency tests of GR using current data do not favour modifications (see e.g., [ref] ).
Parameter splitting in dark energy: is dark energy the same in the background and in the cosmic structures? · Modified gravity · 0.97
Cites as background 27 papers
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EMU [ref] is an all-sky radio-continuum survey using the Australian SKA Pathfinder (ASKAP) radio telescope [ref] .
EMU: Evolutionary Map of the Universe · Introduction · 0.85
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EMU [ref] is an all-sky radio-continuum survey using the Australian SKA Pathfinder (ASKAP) radio telescope [ref] .
Radio Continuum Surveys with Square Kilometre Array Pathfinders · Introduction · 0.85
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We only consider scale independent modifications of GR, but there are several possible parameterizations of $μ(z,k)$ and $γ(z,k)$ [ref] .
Planck 2018 results. VI. Cosmological parameters · Modified gravity · 0.80
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