Cosmic Homogeneity and Large-Scale Structure
Summary
The large-scale structure of the Universe arises from the gravitational amplification of primordial fluctuations, producing a cosmic web of galaxies, filaments, clusters and voids. At sufficiently large scales – of order 100–200 megaparsecs – these structures give way to statistical homogeneity, a regime in which the matter distribution becomes uniform and adheres to the Cosmological Principle. Tests of homogeneity employ the scaling behaviour of galaxy counts within spheres or the two-point correlation function to identify the transition scale at which density fluctuations average out. Simultaneously, mapping the intricate network of filaments and voids reveals the hierarchical arrangement of mass, governed by dark matter dynamics under the Λ Cold Dark Matter framework. Robust measurements of the homogeneity scale, rigorous isotropy tests and fractal analyses together consolidate our empirical foundation for modern cosmology, guiding constraints on fundamental parameters and tracing the evolution of structure across cosmic time.
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Cosmic Homogeneity and Large-Scale Structure publication trend
The graph below shows the total number of articles in cosmic homogeneity and large-scale structure across all publications each year (not limited to Nature Index journals).
Technical terms
Cosmic homogeneity scale: The spatial scale above which matter distribution appears uniform and fluctuations average out.
Two-point correlation function: A statistical measure of the excess probability of finding pairs of objects at a given separation compared to a random distribution.
Fractal dimension: A parameter describing how galaxy counts scale with radius, indicating departure from uniformity when below three.
Dipole Repeller: A large-scale underdensity inferred from peculiar velocity flows, influencing the motion of nearby galaxies.
References
- Probing cosmic isotropy in the Local Universe. Monthly Notices of the Royal Astronomical Society (2023).
- Can the angular scale of cosmic homogeneity be used as a cosmological test?. European Physical Journal C (2024).
- The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity. Monthly Notices of the Royal Astronomical Society (2012).
- The Fractal Geometry of the Cosmic Web and Its Formation. Advances in Astronomy (2019).
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