Detection of cosmic strings by gravitational wave lensing. Predictions for Einstein Telescope

Cosmic strings are not yet confirmed, topological defects formed in the early Universe. They can bend light or gravitational waves, which causes an effect similar to the gravitational lensing. Our goal is to check whether cosmic string could be detected as a lenses of gravitational waves by the Einstein Telescope (ET). To do that the apparatus of wave optics had been applied. Firstly we explored the amplification factor strength and behaviour. Next the wave effects in SNRs and waveforms was examined for different inclinations of the source. Lastly we estimated the string tensions based on eight mergers from the StarTrack simulation, using the Bayesian Inference methods. The wave effects were easily to see in waveforms, SNR and characteristic strains. Also most of the events could be detected, based on their Signal to Noise Ratio values. Almost whole characteristic strain lies in the range of the ET. When it comes to mock observations, we had got estimated vale of a logarithm of the CS tension equal to =-9.78+0.44-0.49, which were consistent with injected value equal to-10. At the end we conclude that CSs could be detected by the ET.