讲座主题：Gravitational Wave Signature of Aspherical Bubbles

Driven by Thermal Fluctuation

专家姓名：肖洋

工作单位：河南师范大学

讲座时间：2026年6月26日星期五17:00-18:30

讲座地点：烟台大学化院北322会议室

主办单位：烟台大学物理与电子信息学院

内容摘要：Cosmological first-order phase transitions are a well-motivated source of stochasticgravitational waves (Gws), but most predictions are made based on the highly idealized model ofperfectly spher ical vacuum bubbles, neglecting thermal fluctuations. In this work we use (3+1)-dimensional lattice simulations of a scalar model with thermal initial conditions to quantify howthermal fluctuations distort bubble profiles and modify the resulting GW spectrum. We find thathermal fluctuations can strongly break spherical symmetry at early times, allowing even an isolatedbubble to emit GWs. In multi-bubble simulations, thermal fluctuations systematically reshape thespectrum, suppressing the infrared part while enhancing and broadening the high-k tail. We furtherprovide an analytical estimate for the ultraviolet regime of the GW spectrum, which is in goodagreement with our lattice results and suggests that this regime is dominated by thermalfluctuations. These effects could leave observable imprints in future GW searches.