From harmonic to Newman-Unti coordinates at the second post-Minkowskian order

Pujian Mao; Baijun Zeng

doi:10.1103/wl8z-ctjn

From harmonic to Newman-Unti coordinates at the second post-Minkowskian order

Pujian Mao ^* and Baijun Zeng ^†

Center for Joint Quantum Studies, Department of Physics, School of Science, Tianjin University, 135 Yaguan Road, Tianjin 300350, China

^*Contact author: pjmao@tju.edu.cn
^†Contact author: zeng@tju.edu.cn

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Phys. Rev. D 113, 044015 – Published 5 February, 2026

DOI: https://doi.org/10.1103/wl8z-ctjn

Abstract

In this paper, we present the complete transformations of a generic metric from (generalized) harmonic to Newman-Unti coordinates up to the second post-Minkowskian order $(G^{2})$ . This allows us to determine the asymptotic shear, the Bondi mass aspect, and the angular-momentum aspect at both orders.

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From harmonic to Newman-Unti coordinates at the second post-Minkowskian order

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From harmonic to Newman-Unti coordinates at the second post-Minkowskian order

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