报告题目:Space-based Optical Lattice Clocks as Gravitational Wave Detectors in Search for New Physics

报告人：王博

报告时间：2024年11月19日(周二)下午13:30-15:30

报告地点：浙江工业大学理学楼二楼师生活动中心

摘要(Abstract)：We investigate the sensitivity and performance of space-based Optical Lattice Clocks (OLCs) in detecting gravitational waves, in particular the Stochastic Gravitational Wave Background (SGWB) at low frequencies (10^,{-4}, 1)Hz, which are inaccessible to ground-based detectors. We first analyze the response characteristics of a single OLC detector for SGWB detection and compare its sensitivity with that of Laser Interferometer Space Antenna (LISA). Due to longer arm lengths, space-based OLC detectors can exhibit unigue frequency responses and enhance the capability to detect SGWB in the low-frequency range, but the sensitivity of a single OLC detector remains insufficient overall compared to LISA. Then, as a preliminary plan, we propose a novel method for space-based OLC detectors that can significantly improve the signal-to-noise ratio (SNR) by utilizing the cross-correlation between two of them. This method leverages the uncorrelated origins but statistically similar properties of noise in two detectors while the SGWB signal is correlated between them, thus achieving effective noise suppression and sensitivity enhancement, Our results indicate that the cross-correlation technique can improve the sensitivity by approximately an order of magnitude compared to a single OLC detector configuration, and even would surpass current detection systems such as LISA in the full-band detection capability of SGWB.

报告人简介(Bio)：王博，男，中国科学技术大学特任副研究员。主要从事非线性宇宙学扰动、引力波和早期宇宙相关研究。共发表SCI论文24篇，其中以第一/共同通讯作者发表15篇，包括以共同通讯作者发表PRL一篇、以第一作者兼通讯作者发表ApJS一篇。 

邀请人：朱涛