The Full-Shape Alcock-Paczynski Test in a Bounced Cosmology
Year: 2026
Type: article
Abstract: This paper computes the Alcock-Paczynski ratio from the full shape of galaxy clustering for a cosmology whose early expansion passed through a torsion-regulated bounce, and compares the result with full-shape clustering analyses of BOSS and eBOSS galaxy samples. The background is the Planck 2018 fiducial cosmology; the bounce enters through a fractional sound-horizon shift of 0.0 and a growth index of 0.56 in place of the standard 0.55, with no parameter adjusted to the survey data. The combined test statistic is 11.82 for the standard history and 11.61 for the bounced history, over the bins used here. The full set of computed values, bin by bin, is deposited with the paper in machine-readable form. The comparison shows where current survey precision stands relative to the size of the offset a bounce predicts: in several bins the offset is smaller than the present uncertainty, so the framework is neither confirmed nor excluded by this statistic today, while the forecast precision of completed surveys reaches the level at which the two histories separate. This study is computed from stated assumptions and published summary statistics; it is not a measurement.
Author: Aldred, William Alexander
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225807438
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