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The Alcock-Paczynski test in redshifted twenty one centimeter maps

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arxiv astro-ph/0410420 v2 pith:4G2MKAQW submitted 2004-10-18 astro-ph

classification astro-ph
keywords alcock-paczynskiangularcosmologicaldistancedistortionsfrequencyfunctionmaps
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We examine the possibility of constraining the cosmological mean mass and dark energy densities by an application of the Alcock-Paczynski test on redshifted 21-cm maps of the epoch of reionization. The 21-cm data will be provided as a function of frequency and angular positions on the sky. The ratio of the frequency to angular distance scales can be determined by inspecting the anisotropy pattern of the correlation function of brightness temperature. We assess the sensitivity of the distance ratio to the cosmological parameters and present a technique for disentangling geometrical distortions from redshift space distortions caused by peculiar motions.

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  1. An Alcock-Paczynski Test on Reionization Bubbles for Cosmology

    astro-ph.CO 2025-02 conditional novelty 6.0 of 10

    Stacks of reionization HII bubbles act as standard spheres, allowing a forecast ~2% measurement of D_A H at z=7.5 with SKA-like 21-cm data.

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