谈天说地

Speaking of Space

北京天文馆2015年公众科学讲座系列之五

Public Outreach Science Seminar 2015

Beijing Planetarium

讲座题目：  位于星系中心的超大质量黑洞所揭示的新物理现象（The black hole at the Galactic Center as a unique laboratory for a new physics）

讲演人：    俄罗斯理论与实验物理研究所 扎卡洛夫教授（Alexander F. Zakharov，Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia； Joint Institute for Nuclear Research, Dubna, 141980, Russia）

讲座时间：  2015年5月2日（星期六），下午3:00

讲座地点：  北京天文馆B馆505教室

讲演人/讲座内容简介:

       黑洞是科学家们用于检验广义相对论不可多得的检测场，因此位于星系中心的超大质量黑洞就是最好的试验品。检测手段有两种，一是通过观测星系中心的亮星的轨道，另一个是用无线电手段监测黑洞附近“黑影”的尺寸和形状。在本次讲座中，我们将介绍观测的结果，以及我们所看到的与现有理论的偏差，进而找出黑洞那些特有的、新的物理现象。

There are not too many astrophysical cases where one really has an opportunity to check predictions of general relativity in the strong gravitational field limit. For these aims the black hole at the Galactic Center is one of the most interesting cases since it is the closest supermassive black hole. Now there are two basic observational techniques to investigate a gravitational potential at the Galactic Center, namely, a) monitoring the orbits of bright stars near the Galactic Center to reconstruct a gravitational potential; b) measuring a size and a shape of shadows around black hole giving an alternative possibility to evaluate black hole parameters in mm-band with VLBI-technique. At the moment one can use a small relativistic correction approach for stellar orbit analysis (however, in the future the approximation will not be not precise enough due to enormous progress of observational facilities) while now for smallest structure analysis in VLBI observations one really needs a strong gravitational field approximation. We discuss results of observations, their conventional interpretations, tensions between observations and models and possible hints for a new physics from the observational data and tensions between observations and interpretations.

说明：

• 北京天文馆公众科学讲座至少在每个月的第三个周六举办一次。

•  讲座免费。有剧场票或展厅票的参观者可乘新馆展厅东西两侧的电梯到达505教室；无剧场和展厅票的听众凭有效证件（身份证、学生证、工作证等）于当日下午2点后在售票处领票，从B馆入口安检后入场。

• 座位先到先得，坐满为止。

•  现场将提供翻译。

欢迎您的参与！