量子物理學中的優化||本周物理學術講座
1Optimization from Quantum Physics
報告人：文再文，北京大學北京國際數學研究中心
時間： 5月4日（週四）10:00
單位：中科院物理研究所
地點：M樓253議室
Optimization has been ubiquitous in describing various models in Quantum Physics, for example, electronic structure calculation,many-electron quantum mechanics, Bose-Einstein condensates and etc. It is interesting to see that linear and nonlinear eigenvalue optimization, semi-definite programming and optimization with orthogonality constraints as well many other important fields in optimization play more and more important roles in quantum physics. This talk will present a few recent advance on the interplay between these two fields.
2Holography for Boundary Conformal Field Theory
報告人：朱創新，National Tsing Hua University
時間：5月3日（週三）15:30
單位：中科院理論物理研究所
地點：Conference Hall 322
Conformal field theory (CFT) and boundary conformal field theory (BCFT) are crucial to the description of critical phenomena and quantum phase transition in many-body condensed matter system and quantum field theory. (B)CFT are also fundamental building blocks in string theory. In this talk, I will discuss an extension of the AdS/CFT correspondence to BCFT. Applications to Weyl anomaly, entanglement entropy of BCFT will be discussed. Comparsion with other concurrent proposal will be scrutinized.
3Liquid crystalline photonic crystals for femtoseconds laser pulse modulations
報告人：Iam Choon Khoo，
時間：5月4日（週四）10:00
單位：北京大學現代光學研究所
地點：物理樓中樓215會議室
Liquid crystals possess extremely large optical nonlinearities that can be used in conjunction with various nano-structures and lasers ranging from the femtoseconds to CW operations, due to their extraordinarily large individual (organic) molecular nonlinearities that response in the sub-picoseconds time scale and collective crystalline optical nonlinearities that response in milliseconds –nanoseconds. This presentation is focused on recently obtained results of femto-seconds pulse compression/stretching/recompression, as well as slow light generation with cholesteric liquid crystals (CLC). We will discuss the underlying theory and recent corroborating experimental observations of these ultrafast phenomena. Since CLC can be fabricated to yield photonic bandgap and band-edge wavelength location throughout the visible to near IR regime, the aforementioned processes can be realized with any laser wavelength in this broad spectral range.
4從散射輻射傳輸成像到定量精細遙感的資訊鏈——從資料到資訊，從資訊到知識
報告人：金亞秋，復旦大學
時間： 5月5日（週五）15:00
單位：北京大學大氣與海洋科學系
地點：物理樓北547
5Black Holes and Gravitational Waves
報告人：Anthony Lasenby，Kavli Institute for Cosmology, Cambridge
時間： 5月5日（週五）16:00
單位：北京大學科維理天文與天體物理研究中心
地點：KIAA-PKU Auditorium
Black hole coalescences are a major source of gravitational waves in the universe. The current status of observations of these will be briefly reviewed, and we then turn to the gravitational waves themselves. The advantages of a particular gauge choice for representing the waves will be argued for, and used to demonstrate some astrophysical consequences relevant to the nearby environment of coalescing black holes, and other sources of gravitational radiation. A link will also be made to a form of gravitational wave 'memory'.
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