The WiggleZ Dark Energy Survey: probing the epoch of radiation domination using large-scale structure

Poole, Gregory B., Blake, Chris, Parkinson, David, Brough, Sarah, Colless, Matthew, Contreras, Carlos, Couch, Warrick, Croton, Darren J., Croom, Scott, Davis, Tamara, Drinkwater, Michael J., Forster, Karl, Gilbank, David, Gladders, Mike, Glazebrook, Karl, Jelliffe, Ben, Jurek, Russell J., Li, I-hui, Madore, Barry, Martin, D. Christopher, Pimbblet, Kevin, Pracy, Michael, Sharp, Rob, Wisnioski, Emily, Woods, David, Wyder, Ted K. and Yee, H. K. C. (2013) The WiggleZ Dark Energy Survey: probing the epoch of radiation domination using large-scale structure. Monthly Notices of the Royal Astronomical Society, 429 3: 1902-1912. doi:10.1093/mnras/sts431

Author Poole, Gregory B.
Blake, Chris
Parkinson, David
Brough, Sarah
Colless, Matthew
Contreras, Carlos
Couch, Warrick
Croton, Darren J.
Croom, Scott
Davis, Tamara
Drinkwater, Michael J.
Forster, Karl
Gilbank, David
Gladders, Mike
Glazebrook, Karl
Jelliffe, Ben
Jurek, Russell J.
Li, I-hui
Madore, Barry
Martin, D. Christopher
Pimbblet, Kevin
Pracy, Michael
Sharp, Rob
Wisnioski, Emily
Woods, David
Wyder, Ted K.
Yee, H. K. C.
Title The WiggleZ Dark Energy Survey: probing the epoch of radiation domination using large-scale structure
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2013-03
Year available 2013
Sub-type Article (original research)
DOI 10.1093/mnras/sts431
Open Access Status DOI
Volume 429
Issue 3
Start page 1902
End page 1912
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2014
Language eng
Formatted abstract
We place the most robust constraint to date on the scale of the turnover in the cosmological matter power spectrum using data from the WiggleZ Dark Energy Survey. We find this feature to lie at a scale of k0 = 0.0160+0.0035 -0.0041 (h Mpc-1) (68 per cent confidence) for an effective redshift of zeff = 0.62 and obtain from this the first ever turnover-derived distance and cosmology constraints: a measure of the cosmic distance-redshift relation in units of the horizon scale at the redshift of radiation-matter equality (rH) ofDV(zeff = 0.62)/rH = 18.3+6.3 -3.3 and, assuming a prior on the number of extra relativistic degrees of freedom Neff =3, constraints on the cosmological matter density parameter ΩM h2 = 0.136+0.026 -0.052 and on the redshift of matter-radiation equality zeq = 3274+631 -1260.We stress that these results are obtained within the theoretical framework of Gaussian primordial fluctuations and linear large-scale bias. With this caveat, all results are in excellent agreement with the predictions of standard ΛCDM models. Our constraints on the logarithmic slope of the power spectrum on scales larger than the turnover are bounded in the lower limit with values only as low as -1 allowed, with the prediction of P(k) ∝ k from standard ΛCDM models easily accommodated by our results. Finally, we generate forecasts to estimate the achievable precision of future surveys at constraining k0, ω;M h2, zeq and Neff.We find that the Baryon Oscillation Spectroscopic Survey should substantially improve upon the WiggleZ turnover constraint, reaching a precision on k0 of ±9 per cent (68 per cent confidence), translating to precisions on ωM h2 and zeq of±10 per cent (assuming a prior Neff =3) and onNeff of +78 -56 per cent (assuming a priorωM h2 = 0.135). This represents sufficient precision to sharpen the constraints on Neff from WMAP, particularly in its upper limit. For Euclid, we find corresponding attainable precisions on (k0, ωM h2, Neff) of (3, 4, +17 -21) per cent. This represents a precision approaching our forecasts for the Planck Surveyor.
Keyword Surveys
Cosmological parameters
Largescale structure of Universe
Baryon acoustic oscillations
Observations Cosmological Interpretation
Luminous Red Galaxies
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 8 times in Scopus Article | Citations
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