Detecting Chiral Gravitational Wave Background with a Dipole Pulsar Timing Array
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910116305960960 |
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| author | Xu, Baoyu Jiang, Hanyu Cai, Rong-Gen Sasaki, Misao Zhang, Yun-Long |
| author_facet | Xu, Baoyu Jiang, Hanyu Cai, Rong-Gen Sasaki, Misao Zhang, Yun-Long |
| contents | The pulsar timing array (PTA) is a powerful technique for detecting nanohertz gravitational wave backgrounds (GWBs). However, conventional PTAs lack sensitivity to parity violation in the GWB. In this work, we propose a dipole pulsar timing array system (dPTA). By deriving the overlap reduction functions (ORFs) from the cross-correlation of timing signals, we find that this system exhibits sensitivity to chiral GWBs in the nanohertz regime. Furthermore, through numerical calculations of its sensitivity curves, we demonstrate that the dPTA extends the detectable frequency range of PTAs for GWBs from the nanohertz to the microhertz regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_08141 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Detecting Chiral Gravitational Wave Background with a Dipole Pulsar Timing Array Xu, Baoyu Jiang, Hanyu Cai, Rong-Gen Sasaki, Misao Zhang, Yun-Long General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology The pulsar timing array (PTA) is a powerful technique for detecting nanohertz gravitational wave backgrounds (GWBs). However, conventional PTAs lack sensitivity to parity violation in the GWB. In this work, we propose a dipole pulsar timing array system (dPTA). By deriving the overlap reduction functions (ORFs) from the cross-correlation of timing signals, we find that this system exhibits sensitivity to chiral GWBs in the nanohertz regime. Furthermore, through numerical calculations of its sensitivity curves, we demonstrate that the dPTA extends the detectable frequency range of PTAs for GWBs from the nanohertz to the microhertz regime. |
| title | Detecting Chiral Gravitational Wave Background with a Dipole Pulsar Timing Array |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.08141 |