2006年在北京大学获得学士学位，2011年在马里兰大学获得博士学位，2011-2014在Perimeter Institute博士后，2014-2017在加州理工学院博士后(Walter Burke Fellow)。2017-2019，清华大学助理教授，2019-now, 清华大学副教授。主要研究方向为粒子物理和宇宙学。We study the properties of the gravitational wave (GW) signalsproduced by first order phase transitions during the inflation era.We show that the power spectrum of the GW oscillates with itswave number. This signal can be observed directly by futureterrestrial and spatial gravitational wave detectors and through theB-mode spectrum in CMB. This oscillatory feature of GW isgeneric for any approximately instantaneous sources occurringduring inflation, and is distinct from the GW from phasetransitions after the inflation. The details of the GW spectrumcontain information about the scale of the phase transition and thelater evolution of the universe.