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| バリオン音響振動 (Baryon Acoustic Oscillations, BAO)× | 弱い重力レンズ× | |
|---|---|---|
| 分野 | 天文学 | 天文学 |
| 系統 | Process / pipeline | Process / pipeline |
| 提唱年≠ | 1970 | 1992 |
| 提唱者≠ | Piet Peebles | Nick Kaiser |
| 種類≠ | Statistical cosmological measurement | Observational measurement method |
| 原典≠ | Peebles, P. J. E., & Yu, J. T. (1970). Primeval adiabatic perturbation in an expanding universe. Astrophysical Journal, 162, 815-836. DOI ↗ | Kaiser, N. (1992). Weak gravitational lensing of distant galaxies. Astrophysical Journal, 388, 272-286. DOI ↗ |
| 別名 | BAO, Baryon Oscillations, Standard Ruler Method | Weak Lensing, Cosmic Shear, Lensing Distortion |
| 関連 | 3 | 3 |
| 概要≠ | Baryon Acoustic Oscillations are imprints of sound waves in the early universe that appear as a characteristic scale in the large-scale distribution of galaxies today. First predicted theoretically by Piet Peebles and Joseph Yu in 1970, and detected observationally by the Sloan Digital Sky Survey in 2005, BAO provides a standard ruler for measuring cosmic distances and constraining the expansion history of the universe. | Weak gravitational lensing occurs when light from distant sources bends slightly as it travels through the universe, passing through the gravitational fields of matter concentrations. Proposed theoretically by Nick Kaiser in 1992, this subtle effect has become one of the most powerful cosmological probes, directly revealing the distribution of all matter (dark and luminous) across cosmic distances. |
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