講座主題：Estimating the Uncertainty of Cosmological First Order Phase Transitions with Numerical Simulations of Bubble Nucleation
專家姓名：肖洋
工作單位：中國科學院理論物理研究所
講座時間：2024年09月20日10:00-11:30
講座地點：化院北312
主辦單位：煙臺大學物理與電子信息學院
內容摘要：
In order to study the validity of analytical formulas used in the calculation of characteristic physical quantities related to vacuum bubbles, we conduct several numerical simulations of bubble kinematics in the context of cosmological first-order phase transitions to determine potentially existing systematic uncertainties. By comparing with the analytical results, we obtain the following observations: (1) The simulated false vacuum fraction will approach the theoretical one with increasing simulated volume. When the side length of the cubic simulation volume becomes larger than 14.5$β^{-1}_th$ , the simulated results do not change significantly; (2) The theoretical expected total number of bubbles do not agree with the simulated ones, which may be caused by the inconsistent use of the false vacuum fraction formula; (3) The different nucleation rate prefactors do not affect the bubble kinetics much; (4) The lifetime distribution in the sound shell model does not obey an exponential distribution, in such a way as to cause a suppression in the gravitational wave spectra.
主講人介紹：
肖洋，中國科學院理論物理研究所在讀博士生。目前研究興趣為：電弱相變與超出標準模型唯象學的交叉; 相變引力波的數值模擬以及聲波的解析模型; 相變引力波的精確計算。
