The cosmic expansion rate, known as the Hubble voltage, has been the subject of controversy due to inconsistencies in measurements. By studying the gravitational lensing that occurs when large objects bend waves (such as light) passing by, the researchers hope to observe multiple copies of the same gravitational wave signal reaching Earth at different times. It is the analysis of the delays between these signals that will help calculate the expansion rate.
The method is based on the detection of black hole binary systems that emit gravitational waves when they merge. Advanced detectors, expected to be operational within the next decade, could allow the observation of these lensed gravitational waves, providing insight into cosmic expansion and other cosmological mysteries.
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