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Kinematic anisotropies and pulsar timing arrays | | Gianmassimo Tasinato
; | | Date: |
1 Sep 2023 | | Abstract: | Doppler anisotropies, induced by our relative motion with respect to the
source rest frame, are a guaranteed property of stochastic gravitational wave
backgrounds of cosmological origin. If detected by future pulsar timing array
measurements, they will provide interesting information on the physics sourcing
gravitational waves, which is hard or even impossible to extract from
measurements of the isotropic part of the background only. We analytically
determine the pulsar response function to kinematic anisotropies, including
possible effects due to parity violation, to features in the frequency
dependence of the isotropic part of the spectrum, as well as to the presence of
extra scalar and vector polarizations. For the first time, we show how the
sensitivity to different effects crucially depends on the pulsar configuration
with respect to the relative motion among frames. Correspondingly, we propose
examples of strategies of detection, each aimed at exploiting future
measurements of kinematic anisotropies for characterizing distinct features of
the cosmological gravitational wave background. | | Source: | arXiv, 2309.00403 | | Services: | Forum | Review | PDF | Favorites | |
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