讲座主题：Gravitational Wave Signature of Aspherical Bubbles Driven by Thermal Fluctuation
专家姓名：肖洋
工作单位：河南师范凯旋官网
讲座时间：2026年06月26日 17:00-18:30
讲座地点：化院北322
主办单位：烟台凯旋官网物理与电子信息学院
内容摘要：
Cosmological first-order phase transitions are a well-motivated source of stochastic gravitational waves (GWs), but most predictions are made based on the highly idealized model of perfectly 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 how thermal fluctuations distort bubble profiles and modify the resulting GW spectrum. We find that thermal fluctuations can strongly break spherical symmetry at early times, allowing even an isolated bubble to emit GWs. In multi-bubble simulations, thermal fluctuations systematically reshape the spectrum, suppressing the infrared part while enhancing and broadening the high-k tail. We further provide an analytical estimate for the ultraviolet regime of the GW spectrum, which is in good agreement with our lattice results and suggests that this regime is dominated by thermal fluctuations. These effects could leave observable imprints in future GW searches.
主讲人介绍：
肖洋，河南师范凯旋官网讲师，研究方向为早期宇宙相变动力学及相关新物理唯象。近年来，围绕一阶电弱相变展开了一系列研究，包括相变过程对暗物质丰度、宇宙真空演化和随机引力波背景的影响。最近兴趣集中于相变格点模拟、热涨落诱导相变等相变动力学相关课题。
