The power-law parametrization for the energy density spectrum of gravitational wave(GW)background is a useful tool to study its physics and origin.While scalar induced secondary gravitational waves(SIGWs)from some par...The power-law parametrization for the energy density spectrum of gravitational wave(GW)background is a useful tool to study its physics and origin.While scalar induced secondary gravitational waves(SIGWs)from some particular models fit the signal detected by NANOGrav,Parkers Pulsar Timing Array,European Pulsar Timing Array,and Chinese Pulsar Timing Array collaborations better than GWs from supermassive black hole binaries(SMBHBs),we test the consistency of the data with the infrared part of SIGWs which is somewhat independent of models.Through Bayesian analysis,we show that the infrared parts of SIGWs fit the data better than GW background from SMBHBs.The results give tentative evidence for SIGWs.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2020YFC2201504)the National Natural Science Foundation of China(Grant No.12175184)+2 种基金supported by the National Natural Science Foundation of China(Grant No.12205015)the supporting fund for Young Researcher of Beijing Normal University(Grant No.28719/310432102)supported by the National Natural Science Foundation of China(Grant No.12305075)。
文摘The power-law parametrization for the energy density spectrum of gravitational wave(GW)background is a useful tool to study its physics and origin.While scalar induced secondary gravitational waves(SIGWs)from some particular models fit the signal detected by NANOGrav,Parkers Pulsar Timing Array,European Pulsar Timing Array,and Chinese Pulsar Timing Array collaborations better than GWs from supermassive black hole binaries(SMBHBs),we test the consistency of the data with the infrared part of SIGWs which is somewhat independent of models.Through Bayesian analysis,we show that the infrared parts of SIGWs fit the data better than GW background from SMBHBs.The results give tentative evidence for SIGWs.
