Title：Recent measurements from POLARBEAR, CIBER, Planck and Fermi-LAT experiments

　　Speaker：Dr. Chang FENG（冯畅）, University of California, Irvine

　　Abstract：POLARBEAR is a cosmic microwave background (CMB) polarization experiment located in the Atacama desert in Chile. The science goals of the POLARBEAR project are to do a deep search for CMB B-mode polarization created by inflationary gravitational waves, as well as characterize the CMB B-mode signal from gravitational lensing. The curl-like polarization patterns (B-modes) of the cosmic microwave background introduced by different sources, such as gravitational lensing effects, cosmic birefringence effects and primordial magnetic fields, could potentially challenge the detection of the primordial B-modes generated by inflationary gravitational waves. CIBER is a rocket-borne instrument that will probe the absolute spectrum and spatial anisotropy of the extragalactic infrared background in a search for signatures from first-light galaxies. An excess of infrared background detected from the recent three flights is indicative of a new source--intrahalo light. From the latest Planck and Fermi-LAT data, dark matter annihilation signatures in the gamma-ray anisotropies are studied in the context of WIMP scenario.

　　About the speaker：

　　A brief CV：

　　2014-present: University of California, Irvine, Department of Physics and Astronomy (Postdoc)

　　2009-2014: University of California, San Diego, Department of Physics (PhD)

　　2006-2009: Fudan University, Department of Physics (MS)

　　2002-2006: Guilin University of Electronic Technology, School of Electromechanical Engineering (BE)

　　Research Collaborations:

• SPHEREx: Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (http://spherex.caltech.edu/)
• CIBER: The Cosmic Infrared Background Experiment (http://ciber.caltech.edu/)
• TIME-pilot: Tomographic Ionized carbon intensity Mapping Experiment
• POLARBEAR (http://bolo.berkeley.edu/polarbear/, http://cosmology.ucsd.edu/)

　　Time：May 25 (Thursday) 10:30am

　　Place：PMO Meeting Room 416 （No. 2 West Beijing Road）

欢迎大家积极参加！

　                                                      　紫金山天文台学术委员会