Strongly lensed gravitational waves as probes to test the cosmic distance duality relation  

作　　者：Hai-Nan Lin Xin Li Li Tang 林海南;李昕;唐丽(Department of Physics,Chongqing University,Chongqing 401331,China;Department of Math and Physics,Mianyang Normal University,Mianyang 621000,China)

机构地区：[1]Department of Physics,Chongqing University,Chongqing 401331,China [2]Department of Math and Physics,Mianyang Normal University,Mianyang 621000,China

出　　处：《Chinese Physics C》2021年第1期406-413,共8页中国物理C（英文版）

基　　金：Supported by the National Natural Science Fund of China(11603005,11775038,11947406)。

摘　　要：The cosmic distance relation(DDR) associates the angular diameters distance(DA) and luminosity distance(DL) by a simple formula,i.e.,DL=(1+z)2 DA.The strongly lensed gravitational waves(GWs) provide a unique way to measure DA and DL simultaneously to the GW source,hence they can be used as probes to test DDR.In this study,we investigated the use of strongly lensed GW events from the future Einstein Telescope to test DDR.We assumed the possible deviation of DDR as(1+z)2 DA/DL=η(z),and considered two different parametrizations of η(z),namely,η1(z)=1+η0 z and η2(z)=1+η0 z/(1+z).Numerical simulations showed that,with about 100 strongly lensed GW events observed by ET,the parameter η0 was constrained at 1.3% and 3% levels for the first and second parametrizations,respectively.

关 键 词：gravitational waves gravitational lensing COSMOLOGY 

分 类 号：P142.84[天文地球—天体物理]