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| Determinació d'òrbites (Problema de Lambert)× | Teoria cosmològica de pertorbacions× | |
|---|---|---|
| Camp | Física aplicada | Física aplicada |
| Família | Process / pipeline | Process / pipeline |
| Any d'origen≠ | 1761 | 1902 |
| Autor original≠ | Johann Heinrich Lambert | James Jeans |
| Tipus≠ | Orbital computation algorithm | Theoretical framework and computational method |
| Font seminal≠ | Lambert, J. H. (1761). Acta Helvetica. Physico-Mathematico-Anatomico-Botanico-Medica. link ↗ | Jeans, J. H. (1902). The stability of a spherical nebula. Philosophical Transactions of the Royal Society A, 199, 1-53. DOI ↗ |
| Àlies≠ | Lambert's problem, Lambert-Godstein trajectory problem | structure formation theory, linear perturbations, growth of density fluctuations |
| Relacionats≠ | 4 | 3 |
| Resum≠ | Lambert's problem is a classical astrodynamics boundary-value problem that determines an orbit connecting two points in space given a transfer time. Formulated by Johann Heinrich Lambert in the 18th century, it is fundamental to trajectory design for interplanetary missions and spacecraft maneuvers. The solution provides the orbital elements and velocities needed to transition between two positions. | 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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