CPTA Could Refine Hubble Constant Measurement via SMBHB Searches

The research proposes a novel approach to utilizing Pulsar Timing Arrays (PTA) for precision cosmology, specifically targeting the inference of the Hubble constant. By employing targeted searches for supermassive black hole binaries (SMBHBs), the Chinese Pulsar Timing Array (CPTA) could potentially achieve a precision of 2 km/s/Mpc in determining the Hubble constant. This level of precision, derived from an independent cosmological probe, could offer decisive support in resolving the existing Hubble tension, a significant discrepancy between different methods of measuring the universe's expansion rate. The method's robustness against confusion between the host galaxies of SMBHB sources in realistic observing scenarios further strengthens its potential. The use of simulated data informed by current PTA observations is crucial for validating the approach and assessing its limitations. The success of this method hinges on the ability to accurately model and account for potential systematic errors in PTA observations. Furthermore, the effectiveness of targeted searches for SMBHBs is paramount to achieving the desired precision in Hubble constant inference. The implications of a more precise Hubble constant measurement extend beyond resolving the current tension, potentially leading to refinements in cosmological models and a deeper understanding of the nature of dark energy. The potential for expanding this approach with data from other pulsar timing arrays could further enhance the precision and reliability of the Hubble constant measurement.

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