Radio Band Gravitational Wave Detection Enhanced by Pulsar Magnetospheres

This research explores the potential of detecting radio-band gravitational waves (GWs) through their interaction with pulsar magnetospheres, leveraging the Gertsenshtein-Zeldovich effect. The focus is on using the FAST and SKA2-MID telescopes to observe specific pulsars and detect electromagnetic signals produced by GWs. The study proposes the 'Multiple Pulsars with Multiple Telescopes' (MPMT) method to enhance detection sensitivity by cross-validating signals and rejecting false positives. Numerical simulations project the minimum detectable characteristic strain for transient events and stochastic backgrounds, suggesting that radio-band searches could approach the sensitivity needed to test very high-frequency GW scenarios. This approach could provide insights into primordial black hole mergers and the origin of repeating fast radio bursts.

The MPMT method's ability to reduce false positives is crucial for reliable GW detection. The projected sensitivities, while promising, rely on optimistic assumptions about integration time and conversion efficiency, highlighting the need for further research to refine these estimates. The potential link between GW conversion in pulsar magnetospheres and repeating fast radio bursts opens a new avenue for understanding these enigmatic phenomena.

Future work should focus on improving the accuracy of simulations, exploring a wider range of pulsar parameters, and developing more sophisticated signal processing techniques. The successful detection of radio-band GWs would represent a significant advancement in multi-messenger astronomy, providing complementary information to observations from LIGO and Virgo. This research contributes to the ongoing effort to map the gravitational wave spectrum and probe the fundamental physics of the universe.

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