标题： 来自kination阶段的引力子制动辐射的引力波 显示英文标题

标题： Gravitational waves from graviton Bremsstrahlung with kination phase

摘要： 引力波（GWs）来自引力三体衰变（引力子制动辐射过程），可以在超高频率下留下不可磨灭的信号。我们关注一种场景，其中超重粒子在暴胀相和动能相之间的转换期间通过引力产生，并分析在暴胀期间真空涨落产生的引力波存在的情况下该信号的可探测性。我们发现，在许多情况下，来自引力子制动辐射的引力波被起源于暴胀的随机引力波背景所掩盖。然而，如果超重粒子的质量达到普朗克尺度，引力子制动辐射可以产生大量引力波，超过暴胀产生的引力波。 显示英文摘要

摘要： Gravitational waves (GWs) from gravitational three-body decay (graviton Bremsstrahlung process) can leave an indelible signal at ultrahigh frequencies. We focus on a scenario where superheavy particles are produced gravitationally at a transition between the inflationary and kination phases and analyze the detectability of the signal in the presence of GWs generated from the vacuum fluctuations during inflation. We find that, in many cases, GWs from the graviton Bremsstrahlung are buried in the stochastic gravitational wave background originating from inflation. However, if the superheavy particles are as heavy as the Planck scale, the graviton Bremsstrahlung can produce a sizable amount of GWs, surpassing the inflationary ones.