Local Hole

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KBC Void
)

The KBC Void (or Local Hole) is an immense, comparatively empty region of space, named after astronomers Ryan Keenan, Amy Barger, and Lennox Cowie, who studied it in 2013.[1] The existence of a local underdensity has been the subject of many pieces of literature and research articles.[2][3][4]

The underdensity is proposed to be roughly spherical, approximately 2 billion light-years (600 megaparsecs, Mpc) in diameter. As with other voids, it is not completely empty but contains the Milky Way, the Local Group, and the larger part of the Laniakea Supercluster. The Milky Way is within a few hundred million light-years of the void's center.[5]

It is debated whether the existence of the KBC void is consistent with the

Hubble constant, a cosmological measure of how fast the universe expands. Some authors have proposed the structure as the cause of the discrepancy between measurements of the Hubble constant using galactic supernovae and Cepheid variables (72–75 km/s/Mpc) and from the cosmic microwave background and baryon acoustic oscillation data (67–68 km/s/Mpc).[8]

Other work has found no evidence for this in observations, finding the scale of the claimed underdensity to be incompatible with observations which extend beyond its radius.

MOND gravity rather than general relativity.[6] It was later discovered that this outflow model successfully predicted the bulk flow curve, an important measure of the velocity field in the local Universe.[10]

See also

References

  1. S2CID 118433293
    .
  2. S2CID 18260737
    .
  3. S2CID 2115068
    .
  4. ISSN 0035-8711
    .
  5. ^ Siegel, Ethan. "We're Way Below Average! Astronomers Say Milky Way Resides In A Great Cosmic Void". Forbes. Retrieved 2017-06-09.
  6. ^
    ISSN 0035-8711
    .
  7. S2CID 119286482
    .
  8. ISSN 1745-3925
    .
  9. S2CID 119095484
    .
  10. ISSN 0035-8711
    .

Further reading
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