Kavli Affiliate: Xian Chen| Summary: The measurement of the Hubble constant $H_0$ plays an important role in the study of cosmology. In this letter, we propose a new method to constrain the Hubble constant using the strongly lensed gravitational wave (GW) signals. By reparameterizing the waveform, we find that the lensed waveform is sensitive to the $H_0$. Assuming the scenario that no electromagnetic counterpart of the GW source can be identified, our method can still give meaningful constraints on the $H_0$ with the information of the lens redshift. We then apply Fisher information matrix and Markov Chain Monte Carlo to evaluate the potential of this method. For the space-based GW detector, TianQin, the $H_0$ can be constrained within a relative error of $sim$ 0.3-2%, using a single strongly lensed GW event. Precision varies according to different levels of electromagnetic information.| Search Query: arXiv Query: search_query=au:”Chen Xian”&id_list=&start=0&max_results=10Read More