| 报告题目： |
Tomographic Alcock-Paczynski test: promising results from SDSS-III BOSS galaxies |
| 报告人： |
李霄栋副教授 |
| 报告人单位： |
中山大学 |
| 报告时间： |
2017年12月19日上午10点 |
| 报告地点： |
东七楼，四楼427会议室 |
| 报告摘要： |
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The distribution of the observed galaxies is anisotropic due to two reasons: the RSD effect (galaxy peculiar motion) and the Alcock-Paczynksi (AP) effect. AP appears when an incorrect cosmological theory is assumed for transforming galaxy redshifts to comoving distances. Anisotropies produced by the RSD effect are, although large, maintaining a nearly uniform pattern over a large range of redshift. On the other hand, the degree of anisotropies from AP varies with redshift significantly. We make use of this fact to probe AP and avoid the large effect of RSD.
We apply this concept to the 1.4 million SDSS-III BOSS galaxies lying in 0.15<z<0.7. We split the galaxies into six redshift bins, measure the anisotropic 2-point correlation function in each bin, and assess the redshift evolution. The systematics are estimated from the Horizon Run 4 N-body simulation.
The obtained cosmological constraints are as good as, if not better than, the mainstream cosmological probes of SNIa, CMB, and BAO. Combining all method, we obtained Ωm = 0.301 ± 0.006, w = -1.054 ± 0.025. Inclusion of our method reduces the uncertainties by 30-40%. The future of our method is very promising. We expect it to play an important role in the future LSS surveys.
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| 报告人简介： |
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毕业于中国科技大学并于该校获得博士学位，之后在韩国高等研究院从事博士后研究，2017年中山大学聘为副教授。研究方向为宇宙学，集中于暗能量和大尺度结构相关领域。 |
