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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