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Expectations for the Difference Between Local and Global Measurements of the Hubble Constant

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arxiv astro-ph/9707101 v2 pith:QBNNWDDV submitted 1997-07-08 astro-ph

Expectations for the Difference Between Local and Global Measurements of the Hubble Constant

Xiangdong Shi (UCSD) , Michael S. Turner (Chicago , Fermilab) This is my paper
classification astro-ph
keywords varianceconstantglobalhubbleobjectssamplingcosmicdeterminations
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There are irreducible differences between the Hubble constant measured locally and the global value. They are due to density perturbations and finite sample volume (cosmic variance) and finite number of objects in the sample (sampling variance). We quantify these differences for a suite of COBE-normalized CDM models that are consistent with the observed large-scale structure. For small samples of objects that only extend out to 10,000 km/sec, the variance can approach 4%. For the largest samples of Type Ia supernovae (SNeIa), which include about 40 objects and extend out to almost 40,000 km/sec, the variance is 1-2% and is dominated by sampling variance. Sampling and cosmic variance may be an important consideration in comparing local determinations of the Hubble constant with precision determinations of the global value that will be made from high-resolution maps of CBR anisotropy.

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  1. Updates on dipolar anisotropy in local measurements of the Hubble constant from Cosmicflows-4

    astro-ph.CO 2025-12 unverdicted novelty 4.0

    Local Hubble constant anisotropy in Cosmicflows-4 data is primarily attributed to peculiar velocities and survey structure rather than cosmic-scale isotropy violation, with limited implications for the Hubble tension.