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Kinematic anisotropies and pulsar timing arrays
Physical Review D, Volume: 108, Issue: 10
Swansea University Author:
Gianmassimo Tasinato
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DOI (Published version): 10.1103/physrevd.108.103521
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...
| Published in: | Physical Review D |
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| ISSN: | 2470-0010 2470-0029 |
| Published: |
American Physical Society (APS)
2023
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa65008 |
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| 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. |
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| Keywords: |
Cosmology, gravitational waves, kinematic anisotropies |
| College: |
Faculty of Science and Engineering |
| Funders: |
G. T. is partially funded by the STFC (Grant No. ST/T000813/1). |
| Issue: |
10 |