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• W2079231387 abstract "We explore the requirements for a Lyman-$ensuremath{alpha}$ forest survey designed to measure the angular diameter distance and Hubble parameter at $2ensuremath{lesssim}zensuremath{lesssim}4$ using the standard ruler provided by baryonic acoustic oscillations (BAO). The goal would be to obtain a high enough density of sources to probe the three-dimensional density field on the scale of the BAO feature. A percent-level measurement in this redshift range can almost double the Dark Energy Task Force figure of merit, relative to the case with only a similar precision measurement at $zensuremath{sim}1$, if the Universe is not assumed to be flat. This improvement is greater than the one obtained by doubling the size of the $zensuremath{sim}1$ survey, with Planck and a weak Sloan Digital Sky Survey-like $z=0.3$ BAO measurement assumed in each case. Galaxy BAO surveys at $zensuremath{sim}1$ may be able to make an effective $mathrm{Ly}ensuremath{alpha}$ forest measurement simultaneously at minimal added cost, because the required number density of quasars is relatively small. We discuss the constraining power as a function of area, magnitude limit (density of quasars), resolution, and signal-to-noise of the spectra. For example, a survey covering 2000 sq. deg. and achieving $S/N=1.8$ per AA{} at $g=23$ ($ensuremath{sim}40text{ }text{ }mathrm{quasars}$ per sq. deg.) with an $Rensuremath{gtrsim}250$ spectrograph is sufficient to measure both the radial and transverse oscillation scales to 1.4% from the $mathrm{Ly}ensuremath{alpha}$ forest (or better, if fainter magnitudes and possibly Lyman-break galaxies can be used). At fixed integration time and in the sky-noise-dominated limit, a wider, noisier survey is generally more efficient; the only fundamental upper limit on noise being the need to identify a quasar and find a redshift. Because the $mathrm{Ly}ensuremath{alpha}$ forest is much closer to linear and generally better understood than galaxies, systematic errors are even less likely to be a problem." @default.
• W2079231387 created "2016-06-24" @default.
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• W2079231387 date "2007-09-27" @default.
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• W2079231387 title "Dark energy and curvature from a future baryonic acoustic oscillation survey using the Lyman-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>α</mml:mi></mml:math>forest" @default.
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• W2079231387 doi "https://doi.org/10.1103/physrevd.76.063009" @default.
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