Select
Evolution law of Wigner function in laser process
Rui He, Jun-Hua Chen, Hong-Yi Fan
Front. Phys. . 2013, 8 (4 ): 381-385.
https://doi.org/10.1007/s11467-013-0334-8
Based on the density operator’s o perator-sum representation r ecently obtained by Fan and Hu for a laser process (Opt. Commun., 2008, 281: 5571; Opt. Commun., 2009, 282: 932; Phys. Lett. B, 2008, 22: 2435), we derive the evolution law of Wigner operator, the law is concisely expressed in the normally ordered formΔ ( α , α * , t ) = T π :exp ? [ - 2 T ( a ? e - ( κ - g ) t - α * ) - ( a e - ( k - g ) t - α ) ] :, where g and κ are the cavity gain and the loss, respectively, and T ≡ (κ -g )(κ +g -2g e-2(κ -g ) t )-1 . When t = 0 , Δ ( α , α , t ) → 1 π : exp ? [ - 2 ( a ? - α * ) - ( a - α ) ] :, which is the initial Wigner operator. Using this formalism the evolution law of Wigner functions in laser process can be directly obtained.
References |
Related Articles |
Metrics
Select
Introduction to the CDEX experiment
Ke-Jun Kang, Jian-Ping Cheng, Jin Li, Yuan-Jing Li, Qian Yue, Yang Bai, Yong Bi, Jian-Ping Chang, Nan Chen, Ning Chen, Qing-Hao Chen, Yun-Hua Chen, Yo-Chun Chuang, Zhi Deng, Qiang Du, Hui Gong, Xi-Qing Hao, Hong-Jian He, Qing-Ju He, Xin-Hui Hu, Han-Xiong Huang, Teng-Rui Huang, Hao Jiang, Hau-Bin Li, Jian-Min Li, Jun Li, Xia Li, Xin-Ying Li, Xue-Qian Li, Yu-Lan Li, Heng-Ye Liao, Fong-Kay Lin, Shin-Ted Lin, Shu-Kui Liu, Ya-Bin Liu, Lan-Chun Lü, Hao Ma, Shao-Ji Mao, Jian-Qiang Qin, Jie Ren, Jing Ren, Xi-Chao Ruan, Man-Bin Shen, Man-Bin Shen, Lakhwinder Simgh, Manoj Kumar Singh, Arun Kumar Soma, Jian Su, Chang-Jian Tang, Chao-Hsiung Tseng, Ji-Min Wang, Li Wang, Qing Wang, Tsz-King Henry Wong, Xu-Feng Wang, Shi-Yong Wu, Wei Wu, Yu-Cheng Wu, Zhong-Zhi Xianyu, Hao-Yang Xing, Xun-Jie Xu, Yin Xu, Tao Xue, Li-Tao Yang, Song-Wei Yang, Nan Yi, Chun-Xu Yu, Hao Yu, Xun-Zhen Yu, Xiong-Hui Zeng, Zhi Zeng, Lan Zhang, Yun-Hua Zhang, Ming-Gang Zhao, Wei Zhao, Su-Ning Zhong, Jin Zhou, Zu-Ying Zhou, Jing-Jun Zhu, Wei-Bin Zhu, Xue-Zhou Zhu, Zhong-Hua Zhu
Front. Phys. . 2013, 8 (4 ): 412-437.
https://doi.org/10.1007/s11467-013-0349-1
It is believed that weakly interacting massive particles (WIMPs) are candidates for dark matter (DM) in our universe which come from outer space and might interact with the standard model (SM) matter of our detectors on the earth. Many collaborations in the world are carrying out various experiments to directly detect DM particles. China Jinping underground Laboratory (CJPL) is the deepest underground laboratory in the world and provides a very promising environment for DM search. China Dark matter EXperiment (CDEX) is going to directly detect the WIMP flux with high sensitivity in the low WIMP-mass region. Both CJPL and CDEX have achieved a remarkable progress in recent three years. CDEX employs a point-contact germanium (PCGe) semi-conductor detector whose energy threshold is less than 300 eV. In this report we present the measurement results of muon flux, monitoring of radioactivity and radon concentration carried out in CJPL, as well describing the structure and performance of the 1 kg-PCGe detector in CDEX-1 and 10 kgPCGe detector array in CDEX-10 including the detectors, electronics, shielding and cooling systems. Finally we discuss the physics goals of CDEX-1, CDEX-10 and the future CDEX-1T experiments.
References |
Related Articles |
Metrics
Select
Progress in physical properties of Chinese stock markets
Yuan Liang梁源, Guang Yang杨光, Ji-Ping Huang黄吉平
Front. Phys. . 2013, 8 (4 ): 438-450.
https://doi.org/10.1007/s11467-013-0366-0
In the past two decades, statistical physics was brought into the field of finance, applying new methods and concepts to financial time series and developing a new interdiscipline “econophysics”. In this review, we introduce several commonly used methods for stock time series in econophysics including distribution functions, correlation functions, detrended fluctuation analysis method, detrended moving average method, and multifractal analysis. Then based on these methods, we review some statistical properties of Chinese stock markets including scaling behavior, long-term correlations, cross-correlations, leverage effects, antileverage effects, and multifractality. Last, based on an agent-based model, we develop a new option pricing model — financial market model that shows a good agreement with the prices using real Shanghai Index data. This review is helpful for people to understand and research statistical physics of financial markets.
References |
Related Articles |
Metrics
Select
DNA condensation and size effects of DNA condensation agent
Yan-Hui Liu, Chong-Ming Jiang, Xin-Miao Guo, Yan-Lin Tang, Lin Hu
Front. Phys. . 2013, 8 (4 ): 467-471.
https://doi.org/10.1007/s11467-013-0342-8
Based on the model of the strong correlation of counterions condensed on DNA molecule, by tailoring interaction potential, interduplex spacing and correlation spacing between condensed counterions on DNA molecule and interduplex spacing fluctuation strength, toroidal configuration, rod-like configuration and two-hole configurations are possible. The size effects of counterion structure on the toroidal structure can be detected by this model. The autocorrelation function of the tangent vectors is found as an effective way to detect the structure of toroidal conformations and the generic pathway of the process of DNA condensation. The generic pathway of all of the configurations involves an initial nucleation loop, and the next part of the DNA chain is folded on the top of the initial nucleation loop with different manners, in agreement with the recent experimental results.
References |
Related Articles |
Metrics
11 articles