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The interests to join LCGT Xiang-Hua Zhai 翟向华 [email protected] Shanghai United Center for Astrophysics(SUCA), Shanghai Normal University 2011.02.05. ICRR Motivation • Last summer, Prof. Wei-Tou Ni joined SUCA, Shanghai Normal University • Prompted by Prof. Ni, some colleagues are discussing possible participation in the LCGT project. • I am interested in the quantum scheme of LCGT 2011.02.05. ICRR Quantum noise in LCGT • The sensitivity of LCGT is limited by the quantum noise ——shot noise and radiation-pressure noise – Shot noise is relating to input laser power – Radiation-pressure noise arises from the quantization of the electromagnetic field • The optimal sensitivity SQL can be reached for a given frequency where shot noise and radiation pressure become equal by choosing the best light power 2011.02.05. ICRR My interests • QND study: obtaining a sensitivity better than the SQL – Squeezed light plays a key role in increasing the sensitivity without increasing the laser power and enabling the cryogenic cooling of the interferometer • Optomechanical coupling between radiation pressure and mirror motion : – The effect of the GW is transduced onto the motion of a mirror through optomechanical coupling and then detected by measuring the local motion; – The quantum fluctuations in the power of the beams impinging on the mirrors lead to real mirror displacements having the same effect as that of a gravitational wave. • reading relevant papers and preparing myself to do works towards the above topics. • included in the collaborator list of the proposal “Quantum noise analysis and QND study for LCGT” applied by Prof. Somiya. 2011.02.05. ICRR My research • Research experience – nonlinear optical property of polymer films – Topological defects in early universe – Dark energy – Casimir effect • 39 papers published • Supported by NSFC and Shanghai government and SHNU 2011.02.05. ICRR Part of Publications（1） • Xiang-hua Zhai, Xin-zhou Li, Chao-Jun Feng, The Casimir force of Quantum Spring in the (D+1)-dimensional spacetime, Mod. Phys. Lett. A，2011. • Xin-zhou Li, Hong-bo Cheng, Jie-ming Li, Xiang-hua Zhai, Attractive or repulsive nature of Casimir force for rectangular cavity. Phys.Rev.D56:2155-2162,1997. • Xiang-hua Zhai, Xin-zhou Li, Casimir pistons with hybrid boundary conditions. Phys.Rev.D76:047704,2007. • Xin-zhou Li, Xiang-hua Zhai, The Tachyon inflationary models with exact mode functions. Phys.Rev.D67:067501,2003. • Xiang-hua Zhai, Yan-yan Zhang, Xin-zhou Li, Casimir Pistons for Massive Scalar Fields. Mod.Phys.Lett.A24:393-400,2009. • Xiang-Hua Zhai, You-Dong Xu, Xin-Zhou Li, Viscous generalized Chaplygin gas. Int.J.Mod.Phys.D15:1151-1162,2006. Xin-Zhou Li, Xiang-Hua Zhai, Fermion stars with a global monopole. Phys.Lett.B364:212-215,1995. • Xiang-hua Zhai, Yi-bin Zhao, Dynamics of quintessential inflation. Chin.Phys.15:2465,2006. 2011.02.05. ICRR Part of Publications （2） • Xin-zhou Li, Xiang-hua Zhai, and Guang Chen, Boson D-stars. Astropart.Phys.13:245-252,2000. • Xin-zhou Li, Ping Xi, Xiang-hua Zhai, Quintessential matter surrounding a global monopole. Phys.Lett.B666:125-130,2008. • Xin-zhou Li, Xiang-hua Zhai, Rigorous proof of attractive nature for Casimir force of p odd hypercube. J.Phys.A.,A34:11053-11057,2001. • Xin-Zhou Li, Jian-Gang Hao, Dao-Jun Liu, Xiang-Hua Zhai, On the quintessence with Abelian and non-Abelian symmetry. Int.J.Mod.Phys.A18:5921,2003. • Xiang-hua Zhai, Yi-bin Zhao, A Cosmological model with complex scalar field. Nuovo Cim.B120:1007-1016,2005 • Chiang-Mei Chen, Hong-Bo Cheng, Xin-Zhou Li, Xiang-Hua Zhai, Non-existence of topological defects during inflation beyond the critical value. Class.Quant.Grav.13:701-704,1996. • X. H. Zhai, Repulsive Casimir force, realizable or not? Proceedings of the Ninth AsiaPacific International Conference on Gravitation and Astrophysics, P327, World Scientific, 2010. 2011.02.05. ICRR Thanks 2011.02.05. ICRR