談天說地

Speaking of Space

北京天文館2015年公眾科學(xué)講座系列之五

Public Outreach Science Seminar 2015

Beijing Planetarium

講座題目：  位于星系中心的超大質(zhì)量黑洞所揭示的新物理現(xiàn)象（The black hole at the Galactic Center as a unique laboratory for a new physics）

講演人：    俄羅斯理論與實(shí)驗(yàn)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）

講座時(shí)間：  2015年5月2日（星期六）,，下午3:00

講座地點(diǎn)：  北京天文館B館505教室

講演人/講座內(nèi)容簡介:

       黑洞是科學(xué)家們用于檢驗(yàn)廣義相對論不可多得的檢測場,，因此位于星系中心的超大質(zhì)量黑洞就是最好的試驗(yàn)品。檢測手段有兩種,，一是通過觀測星系中心的亮星的軌道,，另一個(gè)是用無線電手段監(jiān)測黑洞附近“黑影”的尺寸和形狀。在本次講座中，我們將介紹觀測的結(jié)果,，以及我們所看到的與現(xiàn)有理論的偏差,，進(jìn)而找出黑洞那些特有的、新的物理現(xiàn)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.

說明：

• 北京天文館公眾科學(xué)講座至少在每個(gè)月的第三個(gè)周六舉辦一次,。

•  講座免費(fèi),。有劇場票或展廳票的參觀者可乘新館展廳東西兩側(cè)的電梯到達(dá)505教室,；無劇場和展廳票的聽眾憑有效證件（身份證、學(xué)生證,、工作證等）于當(dāng)日下午2點(diǎn)后在售票處領(lǐng)票,，從B館入口安檢后入場。

• 座位先到先得,，坐滿為止,。

•  現(xiàn)場將提供翻譯。

歡迎您的參與,！