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Related Experiment Video

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The Hubble Constant.

Neal Jackson1

  • 1Jodrell Bank Centre for Astrophysics, University of Manchester, Turing Building, Manchester, M13 9PL UK.

Living Reviews in Relativity
|February 7, 2017
PubMed
Summary

Determining the Hubble constant, crucial for understanding the Universe's scale, has improved significantly. Current estimates are between 70-75 km/s/Mpc, a major advance from previous uncertainties.

Area of Science:

  • Cosmology
  • Astronomy
  • Astrophysics

Background:

  • The Hubble constant (H₀) defines the Universe's expansion rate and length scale.
  • Historically, H₀ determinations faced significant uncertainties (factor of 2).
  • Recent progress has narrowed estimates to 60-75 km s⁻¹ Mpc⁻¹.

Purpose of the Study:

  • To review the current status of Hubble constant determinations.
  • To highlight the progress made in refining H₀ measurements over the past two decades.
  • To emphasize the importance of further reducing uncertainty in H₀ for cosmological studies.

Main Methods:

  • Review of current scientific literature and observational programs.
  • Analysis of recent data and methodologies used for H₀ determination.

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  • Comparison of different cosmological models and their reliance on H₀.

    • Main Results:

    • Hubble constant estimates now predominantly fall within the 70-75 km s⁻¹ Mpc⁻¹ range.
    • Uncertainty has decreased from a factor of 2 to approximately 10%.
    • Significant advancements in observational techniques and data analysis have driven this progress.

    Conclusions:

    • The current precision of H₀ measurements is a major achievement in cosmology.
    • Reducing the margin of error to a few percent is critical for future cosmological research.
    • Ongoing and future observational programs are expected to yield a more precise Hubble constant within the next decade.