Detecting Chiral Gravitational Wave Background with a Dipole Pulsar Timing Array
General Relativity and Quantum Cosmology
2026-04-10 v1 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
Abstract
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.
Cite
@article{arxiv.2604.08141,
title = {Detecting Chiral Gravitational Wave Background with a Dipole Pulsar Timing Array},
author = {Baoyu Xu and Hanyu Jiang and Rong-Gen Cai and Misao Sasaki and Yun-Long Zhang},
journal= {arXiv preprint arXiv:2604.08141},
year = {2026}
}
Comments
11 pages, 6 figures