Process / pipelineCosmology
Cosmological Perturbation Theory
Cosmological perturbation theory describes how small density fluctuations in the early universe grow into galaxies, clusters, and large-scale structure under gravity. Originating from James Jeans's 1902 stability analysis and extended by Lifshitz, Bardeen, and others, this theory is the foundation of structure formation cosmology. It explains how quantum fluctuations in the early universe—amplified by inflation—seeded the growth of all cosmic structures.
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Sources
- Jeans, J. H. (1902). The stability of a spherical nebula. Philosophical Transactions of the Royal Society A, 199, 1-53. DOI: 10.1098/rsta.1902.0012 ↗
- Lifshitz, E. M. (1946). On the gravitational stability of the expanding universe. Journal of Physics USSR, 10, 116. link ↗
- Bardeen, J. M., Bond, J. R., Kaiser, N., & Szalay, A. S. (1986). The statistics of peaks of Gaussian random fields. The Astrophysical Journal, 304, 15-61. DOI: 10.1086/164143 ↗