Cosmic Voids and Large-Scale Structure Dynamics

Summary

Cosmic voids are vast underdense regions that occupy the majority of the volume in the large-scale distribution of matter. These expansive cavities, ranging from a few to hundreds of megaparsecs across, are bounded by dense filaments, walls and clusters that form the cosmic web. Although seemingly empty, voids are rich laboratories for testing cosmological models and gravity theories, since they evolve largely under linear dynamics. Their characteristic shapes, abundance and internal flows encode information on matter density, dark energy, neutrino mass and the nature of gravity. Advances in observational surveys and numerical simulations have enabled high‐precision measurements of void size distributions, density and velocity profiles, and void–galaxy correlations. This growing body of work links the dynamics of low‐density regions to the hierarchical growth of structure, and opens a complementary avenue to constrain cosmological parameters and probe fundamental physics beyond the reach of traditional galaxy clustering or lensing analyses.

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Cosmic Voids and Large-Scale Structure Dynamics publication trend

The graph below shows the total number of articles in cosmic voids and large-scale structure dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Cosmic void: A large, underdense region in the cosmic web surrounded by filaments and clusters.

Large-scale structure: The network of filaments, walls, clusters and voids formed by matter distribution on cosmological scales.

Void size function: The statistical distribution of voids as a function of their effective radius.

Radial density profile: The variation of matter density measured as a function of distance from a void centre.

Void–galaxy cross-correlation: A measure of the spatial relationship between void centres and neighbouring galaxies.

References

  1. Cosmology from One Galaxy in a Void?. The Astrophysical Journal Letters (2024).
  2. The perspective of voids on rising cosmology tensions. Astronomy & Astrophysics (2024).
  3. Why cosmic voids matter: nonlinear structure & linear dynamics. Journal of Cosmology and Astroparticle Physics (2023).

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