First astrometric constraints on parity-violation in the gravitational wave background
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915966385913856 |
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| author | Jaraba, Santiago Kuroyanagi, Sachiko Liang, Qiuyue Lin, Meng-Xiang Trodden, Mark |
| author_facet | Jaraba, Santiago Kuroyanagi, Sachiko Liang, Qiuyue Lin, Meng-Xiang Trodden, Mark |
| contents | Astrometry, the precise measurement of stellar positions and velocities, offers a promising approach to probing the low-frequency stochastic gravitational wave background (SGWB). Notably, astrometric vector sky maps are sensitive to parity-violating SGWB signals, which cannot be distinguished using pulsar timing array observations in an isotropic SGWB. We present the first astrometric constraints on parity-violating SGWB using quasar catalogs from Gaia DR3 and VLBA data. By analyzing the $EB$ correlation in the two-point correlation function of the proper motions of the quasars, we find 2$σ$ constraints on the parity-violating SGWB amplitude $h_{70}^2Ω_{V} = -0.020 \pm 0.025$ from Gaia DR3 and $h_{70}^2Ω_{V} = -0.004 \pm 0.010$ from VLBA. These constraints are valid in the frequency range $4.2 \times 10^{-18}\,{\rm Hz} < f < 1.1 \times 10^{-8}\,{\rm Hz}$. Although not currently a tight constraint on theoretical models, this first attempt lays the groundwork for future investigations using more precise astrometric data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_18085 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | First astrometric constraints on parity-violation in the gravitational wave background Jaraba, Santiago Kuroyanagi, Sachiko Liang, Qiuyue Lin, Meng-Xiang Trodden, Mark Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Astrometry, the precise measurement of stellar positions and velocities, offers a promising approach to probing the low-frequency stochastic gravitational wave background (SGWB). Notably, astrometric vector sky maps are sensitive to parity-violating SGWB signals, which cannot be distinguished using pulsar timing array observations in an isotropic SGWB. We present the first astrometric constraints on parity-violating SGWB using quasar catalogs from Gaia DR3 and VLBA data. By analyzing the $EB$ correlation in the two-point correlation function of the proper motions of the quasars, we find 2$σ$ constraints on the parity-violating SGWB amplitude $h_{70}^2Ω_{V} = -0.020 \pm 0.025$ from Gaia DR3 and $h_{70}^2Ω_{V} = -0.004 \pm 0.010$ from VLBA. These constraints are valid in the frequency range $4.2 \times 10^{-18}\,{\rm Hz} < f < 1.1 \times 10^{-8}\,{\rm Hz}$. Although not currently a tight constraint on theoretical models, this first attempt lays the groundwork for future investigations using more precise astrometric data. |
| title | First astrometric constraints on parity-violation in the gravitational wave background |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2505.18085 |