Journal article 131 views
Measuring the circular polarization of gravitational waves with pulsar timing arrays
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Gianmassimo Tasinato ,
Ivonne Zavala Carrasco
Physical Review D, Volume: 110, Issue: 10
Swansea University Authors:
NAYELI CRUZ, Ameek Malhotra , Gianmassimo Tasinato , Ivonne Zavala Carrasco
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DOI (Published version): 10.1103/physrevd.110.103505
Abstract
The circular polarization of the stochastic gravitational wave background (SGWB) is a key observable for characterizing the origin of the signal detected by Pulsar Timing Array (PTA) collaborations. Both the astrophysical and the cosmological SGWB can have a sizeable amount of circular polarization,...
| Published in: | Physical Review D |
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| ISSN: | 2470-0010 2470-0029 |
| Published: |
American Physical Society (APS)
2024
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa68001 |
| Abstract: |
The circular polarization of the stochastic gravitational wave background (SGWB) is a key observable for characterizing the origin of the signal detected by Pulsar Timing Array (PTA) collaborations. Both the astrophysical and the cosmological SGWB can have a sizeable amount of circular polarization, due to Poisson fluctuations in the source properties for the former, and to parity violating processes in the early universe for the latter. Its measurement is challenging since PTA are blind to the circular polarization monopole, forcing us to turn to anisotropies for detection. We study the sensitivity of current and future PTA datasets to circular polarization anisotropies, focusing on realistic modelling of intrinsic and kinematic anisotropies for astrophysical and cosmological scenarios respectively. Our results indicate that the expected level of circular polarization for the astrophysical SGWB should be within the reach of near future datasets, while for cosmological SGWB circular polarization is a viable target for more advanced SKA-type experiments. |
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| Item Description: |
Swansea authors: Nayeli Marisol Jiménez Cruz, Ameek Malhotra, Gianmassimo Tasinato, Ivonne Zavala |
| College: |
Faculty of Science and Engineering |
| Funders: |
We are partially funded by the STFC grants ST/T000813/1 and ST/X000648/1. We also
acknowledge the support of the Supercomputing Wales project, which is part-funded by the
European Regional Development Fund (ERDF) via Welsh Government. |
| Issue: |
10 |