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报告题目:Stochastic background of induced gravitational waves: properties and recent developments

报  告  人:Shi Pi (ITP, CAS)

报告时间:10:00-11:30am, Friday, Oct.30

报告地点:New Science Building C302

报告摘要:Our universe is fulfilled by stochastic gravitational wave background (SGWB) with a large range of frequencies, which may have various astrophysical/cosmological origins in the early universe. In this talk I will briefly review the properties of SGWB induced by the scalar perturbation, as well as its connection to the primordial black holes (PBHs). Last month, NANOGrav reported the discovery of a common-spectrum time residuals in their 12.5-yr data of pulsar timing array, which might be the first detection of such SGWB. I will show that this signal is connected to the planet-mass PBH candidates found by OGLE recently, if there is a dust-like stage prior to late-time reheating.