BEYOND H[subscript 0] AND q[subscript 0]: COSMOLOGY IS NO LONGER JUST TWO NUMBERS
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Neben-2013-BEYOND H-0 AND q(0)_.pdf
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1.02 MB
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Adobe PDF
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Author(s)
Turner, Michael S.
Neben, Abraham Richard
Date Issued
May 2013
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
Neben, Abraham R., and Michael S. Turner. “BEYOND H[subscript 0] AND q[subscript 0]: COSMOLOGY IS NO LONGER JUST TWO NUMBERS.” The Astrophysical Journal 769, no. 2 (May 14, 2013): 133. © 2013 The American Astronomical Society
Version
Final published version
Abstract
For decades, H [subscript 0] and q [subscript 0] were the quest of cosmology, as they promised to characterize our "world model" without reference to a specific cosmological framework. Using Monte Carlo simulations, we show that q [subscript 0] cannot be directly measured using distance indicators with both accuracy (without offset away from its true value) and precision (small error bar). While H [subscript 0] can be measured with accuracy and precision, to avoid a small bias in its direct measurement (of order 5%) we demonstrate that the pair H [subscript 0] and Ω [subscript M] (assuming flatness and w = –1) is a better choice of two parameters, even if our world model is not precisely ΛCDM. We illustrate this with analysis of the Constitution set of supernovae and indirectly infer q [subscript 0] = –0.57 ± –0.04. Finally, we show that it may be possible to directly determine q [subscript 0] with both accuracy and precision using the time dependence of redshifts ("redshift drift").
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1088/0004-637x/769/2/133
