A gravitational wave in an FLRW universe has an effective wave number different from its redshifted frequency, producing an angle-dependent enhancement in pulsar timing residuals that could measure H0.
Soares-Santos et al
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Measuring $H_0$ with pulsar timing arrays
A gravitational wave in an FLRW universe has an effective wave number different from its redshifted frequency, producing an angle-dependent enhancement in pulsar timing residuals that could measure H0.