Adding electromagnetic birefringence to pulsar timing and astrometry to detect gravitational waves
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911406653177856 |
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| author | Inomata, Keisuke Kamionkowski, Marc |
| author_facet | Inomata, Keisuke Kamionkowski, Marc |
| contents | It was recently shown that the time variation of the polarization of electromagnetic waves from pulsars can be used, in cross-correlation with pulsar timing, to probe the chirality of an isotropic gravitational wave background. Here, we show that the expression for the cross-correlation is derived efficiently with the total-angular-momentum formalism and use this framework to extend the formulation to cross-correlation with astrometry. We do so for spin-1 gravitational waves (that may arise in alternative-gravity theories) as well as the general-relativistic spin-2 gravitational waves. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_09759 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Adding electromagnetic birefringence to pulsar timing and astrometry to detect gravitational waves Inomata, Keisuke Kamionkowski, Marc Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology It was recently shown that the time variation of the polarization of electromagnetic waves from pulsars can be used, in cross-correlation with pulsar timing, to probe the chirality of an isotropic gravitational wave background. Here, we show that the expression for the cross-correlation is derived efficiently with the total-angular-momentum formalism and use this framework to extend the formulation to cross-correlation with astrometry. We do so for spin-1 gravitational waves (that may arise in alternative-gravity theories) as well as the general-relativistic spin-2 gravitational waves. |
| title | Adding electromagnetic birefringence to pulsar timing and astrometry to detect gravitational waves |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.09759 |