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9.Qin, Bo (秦波)
National Astronomical Observatories
Chinese Academy of Sciences
A20 Datun Road, Chaoyang
Beijing 100012
P.R.China
Email: qinbo@bao.ac.cn
Fax: +44-1865-273390
Title of talk: Dark Matter and Extra Dimensions
Abstract: Recent observations suggests that our
standard picture of the "collisionless cold dark
matter" model may have problems, and that dark matter particles may have
considerable self-interaction. We find that this self-interaction is a natural
consequence of a world with 3 large extra dimensions, where gravity diviates from Newtonian gravity in submillimeter
scales and takes the r^{-5} law. We also study the
enhanced gravity in large extra dimension scenarios and its implications for
dark matter direct detections.
10.Wu, Xiang-Ping
(武向平)
National
Astronomical Observatories
Chinese
Academy of Sciences
A20
Datun Road, Chaoyang
Beijing
100012
P.R.China
Email: wxp@bao.ac.cn
Title
of talk: Construction and Performance of 21 Centimeter Array (21CMA)
Abstract: 21CMA is an interferometric
radio array dedicated to measurement of the redshifted
21 cm emission/absorption signatures of neutral hydrogen against CMB in the
epoch of reionization. The array, located in Xinjiang, west China, consists of 81 pods with a total of 10287 log
periodic antennas. It operates at frequencies from 50 to 200 MHz, covering a redshift range of 6-27. In this talk, I will present the
motivation, construction and performance of 21CMA and its impact on our understanding
of the history of reionization.
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