一阶相变诱导的引力子轫致辐射：多峰引力波信号
First Order Phase Transition Induced Graviton Bremsstrahlung: A Multi Peak Gravitational Wave Signature
- Indian Institute of Technology Guwahati（印度理工学院古瓦哈提分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究提出一阶相变过程中标量场衰变产生的引力子轫致辐射是新型引力波源，其形成的多峰引力波可作为探测一阶相变微观与宏观演化的独特探针。
AI中文摘要：
来自一阶相变（FOPT）的引力波（GW）传统上由泡碰撞、声波和等离子体湍流产生。我们提出一种由驱动一阶相变的标量场衰变过程中引力子轫致辐射产生的新型微观引力波源。在与轻费米子的Yukawa相互作用存在时，由于引力与能量动量张量的普适耦合，标量衰变必然伴随引力子发射。我们证明这些引力子在相变时期产生额外的随机引力波背景，补充了传统的一阶相变信号。所得引力波谱可呈现特征性多峰结构。与不同引力波分量源自不同宇宙学时期的情景不同，此处考虑的所有贡献均来自同一阶相变的动力学过程，为探测其微观粒子动力学和宏观等离子体演化提供了独特探针。
英文摘要：
Gravitational waves (GWs) from first order phase transitions (FOPTs) are conventionally sourced by bubble collisions, sound waves, and plasma turbulence. We propose a novel microscopic GW source arising from graviton bremsstrahlung during the decay of the scalar field driving the FOPT. In the presence of Yukawa interactions with light fermions, the scalar decay is inevitably accompanied by graviton emission due to the universal coupling of gravity to the energy-momentum tensor. We show that these gravitons generate an additional stochastic GW background during the phase-transition epoch, complementing the conventional FOPT signal. The resulting GW spectrum can exhibit a characteristic multi-peaked structure. Unlike scenarios in which different GW components originate from distinct cosmological epochs, all contributions considered here emerge from the dynamics of the same FOPT, offering a unique probe of both its microscopic particle dynamics and macroscopic plasma evolution.
