Gravitation, Relativity and Cosmology

这个小组通过实验和 关于河外天文学和宇宙学的理论工作。 2.7K热电子各向异性的COBE探测 宇宙背景辐射（CBR）显示了 大到足以从地面和气球上进行研究。 似乎各向异性的特征 角标度从30弧分到COBE分辨率， 10>将是一个强判别理论的性质 结构的起源。 工作将继续进行， 开发映射CBR的技术，并分析 角波动起源的理论。 CBR光谱的长波长部分很重要 作为星系际介质演化的一个限制， 但是光谱没有被很好地测量。 研究将继续 以系统的方法处理主要的实验性问题 问题，从我们的排放中分离CBR 银河 一个可信的星系形成理论必须解释 CBR的特性，星系的观测， 红移大于1的星系际介质， 星系分布和运动的系统学. 相对较低的红移。 研究将继续进行， 发展所需的理论和数值技术 来解释这些现象，并用它们来测试 在一个不断扩大的结构发展模式， 宇宙

This group studies gravity physics via experimental and theoretical work on extragalactic astronomy and cosmology. The COBE detection of anisotropy of the 2.7K thermal cosmic background radiation (the CBR) shows the fluctuations are large enough to be studied from the ground and balloons. It seems likely that the character of the anisotropy on angular scales from 30 arc min to the COBE resolution at about 10> will be a strong discriminant for theories of the nature and origin of structure. Work will continue on the development of techniques to map the CBR and the analysis of theories of the origin of the angular fluctuations. The long wavelength part of the CBR spectrum is important as a constraint on the evolution of the intergalactic medium, but the spectrum is not well measured. Research will continue on a systematic approach to deal with the main experimental problem, the separation of the CBR from the emission from our galaxy. A believable theory of galaxy formation must account for the properties of the CBR, the observations of galaxies and the intergalactic medium at redshifts greater than unity, and the systematics of the distribution and motions of galaxies at relatively low redshifts. Research will continue on the development of the theoretical and numerical techniques needed to interpret these phenomena and use them as tests for the models for the development of structure in an expanding universe.