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Searching anomalous polarization modes of stochastic gravitational wave background with LISA and Taiji

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arxiv 2010.00771 v1 pith:QBHKJ2EE submitted 2020-10-02 gr-qc astro-ph.CO

classification gr-qcastro-ph.CO
keywords modesanomalousgravitationalpolarizationbackgroundnetworkscalarvector
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The vector and scalar polarization modes of gravitational waves do not exist in General Relativity, and their detection would have significant impacts on fundamental physics. In this paper, we explored the detectability of these anomalous polarization modes in a gravitational wave background around 1 mHz with the future LISA-Taiji network. The inherent geometrical symmetry of the network largely simplifies the correlation analysis. By taking a suitable linear combination of the correlated outputs, the contribution of the standard tensor modes can be canceled algebraically, and the anomalous modes can be exclusively examined. We provide concise expressions for the signal-to-noise ratios of the anomalous modes with this cancellation method. We also discuss the possibility of separately estimating the amplitudes of the vector and scalar modes, using the overall frequency dependence of the associated overlap reduction functions.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Alternative LISA-TAIJI networks: polarization separation of the stochastic gravitational wave background

    gr-qc 2026-08 conditional novelty 5.0 of 10

    For stochastic gravitational wave backgrounds containing simultaneous tensor, vector, and scalar modes, the more inclined LISA-TAIJIm network separates polarization components substantially better than LISA-TAIJIp, al...

  2. \texttt{GWBird}: a toolkit for the characterization of the Stochastic Gravitational Wave Background for Ground, Space, and Pulsar Timing Array detectors

    astro-ph.IM 2025-07 conditional novelty 5.0 of 10

    A new, unified Python package computes overlap reduction functions, power-law integrated sensitivity curves, and angular sensitivity curves for ground, space, and pulsar timing array detectors across all gravitational...

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