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The detection of gravitational waves (GWs) provides a powerful tool toconstrain the cosmological parameters. In this paper, we investigate thepossibility of using GWs as standard sirens in testing the anisotropy of theuniverse. We consider the GW signals produced by the coalescence of binaryblack hole systems and simulate hundreds of GW events from the advanced LaserInterferometer Gravitational-Wave Observatory (LIGO) and Virgo. It is foundthat the anisotropy of the universe can be tightly constrained if the redshiftof the GW source is precisely known. The anisotropic amplitude can beconstrained with an accuracy comparable to the Union2.1 complication of type-Iasupernovae if $\gtrsim 400$ GW events are observed. As for the preferreddirection, $\gtrsim 800$ GW events are needed in order to achieve the accuracyof Union2.1. With 800 GW events, the probability of pseudo anisotropic signalswith an amplitude comparable to Union2.1 is negligible. These results show thatGWs can provide a complementary tool to supernovae in testing the anisotropy ofthe universe.

Testing the anisotropy of the universe using the simulated gravitational wave events from advanced LIGO and Virgo