Work

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

Year: 1998

Type: article

Abstract: There are irreducible differences between the Hubble constant measured locally and the global value. They are due to density perturbations, a finite sample volume (cosmic variance), and a finite number of objects in the sample (sampling variance). We quantify these differences for a suite of COBE -normalized cold dark matter models that are consistent with the observed large-scale structure. For small samples of objects that only extend to 10,000 km s -1 , the variance can approach 4%. For the largest samples of Type Ia supernovae (SNe Ia), which include about 40 objects and extend to almost 40,000 km s -1 , 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 cosmic background radiation anisotropy.

Source: The Astrophysical Journal

DOI: 10.1086/305169

Authors: Xiangdong Shi, Michael S. Turner

Institutions: University of California System, Fermi National Accelerator Laboratory, University of Chicago, National Aeronautics and Space Administration

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: National Science Foundation, National Aeronautics and Space Administration, University of Chicago, University of California, San Diego, Fermilab

OpenAlex ID: W2016724450

FWCI: 3.81

Cites: 16

Cited by: 52

Related to: 10