Consistent Truncation of Linearized gravitational waves in de Sitter space-time

Ghanashyam Date; Harsh

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arXiv · 2601.02014

Consistent Truncation of Linearized gravitational waves in de Sitter space-time

Ghanashyam Date·Harsh

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Abstract

An important step in using observations of gravitational waves from bounded sources is to relate the observed waveforms far away from a source to the local dynamics and environment of the source. To isolate and identify different features of the source, multipole expansion of both the radiation field and the source distribution are crucial. At a practical level, these expansions are truncated at some finite multipole order and a consistency issue arises. This was flagged in \cite{CHK} as the emergence of disallowed $\log(r)$ terms in certain asymptotic forms and a particular quadrupolar truncation was proposed which was consistent with the source conservation. In \cite{NKD80}, it was noted (incorrectly) that the particular solution does not satisfy the generalized harmonic gauge condition and this may be the source of appearance of the log(r) terms. In this work the consistency issue is analyzed by explicitly integrating the gauge conditions and the source conservation equations over the conformal time. This gives a general procedure for a consistent truncation. The procedure is verified in generalized harmonic gauge in conformal chart and in the Bondi gauge in Bondi chart.

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Ghanashyam Date, Harsh. 2026-01-05. Consistent Truncation of Linearized gravitational waves in de Sitter space-time. https://arxiv.org/abs/2601.02014

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