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	宇宙論的摂動理論	N体シミュレーション
分野	応用物理学	応用物理学
系統	Process / pipeline	Process / pipeline
提唱年	1902	1687
提唱者	James Jeans	Isaac Newton
種類	Theoretical framework and computational method	Computational simulation algorithm
原典	Jeans, J. H. (1902). The stability of a spherical nebula. Philosophical Transactions of the Royal Society A, 199, 1-53.	Poincaré, H. (1892). Les méthodes nouvelles de la mécanique céleste. Gauthier-Villars.
別名	structure formation theory, linear perturbations, growth of density fluctuations	gravitational N-body problem, many-body simulation
関連	3	5
概要	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.	N-body simulation is a computational method for modeling the dynamics of a system of particles under mutual gravitational forces. Originating from Newton's laws of motion and gravitation, it solves the fundamental equations of celestial mechanics. This technique is essential for understanding planetary orbits, star cluster evolution, and cosmological structure formation.