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• W2804135812 abstract "Gravitational waves perturb the paths of photons, impacting both the time of flight and the arrival direction of light from stars. Pulsar timing arrays can detect gravitational waves by measuring the variations in the time of flight of radio pulses, while astrometry missions such as Gaia can detect gravitational waves from the time-varying changes in the apparent position of a field of stars. Just as gravitational waves impart a characteristic correlation pattern in the arrival times of pulses from pulsars at different sky locations, the deflection of starlight is similarly correlated across the sky. Here, we compute the astrometric correlation patterns for the full range of polarization states found in alternative theories of gravity and decompose the sky-averaged correlation patterns into vector spherical harmonics. We find that the tensor and vector polarization states produce equal power in the electric- and magnetic-type vector spherical harmonics, while the scalar modes produce only electric-type correlations. Any difference in the measured electric and magnetic-type correlations would represent a clear violation of Einstein gravity. The angular correlation functions for the vector and scalar longitudinal modes show the same enhanced response at small angular separations that is familiar from pulsar timing." @default.
• W2804135812 created "2018-06-01" @default.
• W2804135812 creator A5006687149 @default.
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• W2804135812 date "2018-07-10" @default.
• W2804135812 modified "2023-10-10" @default.
• W2804135812 title "Constraining the polarization content of gravitational waves with astrometry" @default.
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• W2804135812 doi "https://doi.org/10.1103/physrevd.98.024020" @default.
• W2804135812 hasPublicationYear "2018" @default.
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