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Gravitational wave echo search establishes upper limits in GW170817 and GW190425, implying new insights for Einstein Telescope.
First gravitational wave echo search using CCEGA-specific parameters: t_echo = 14 ms, Δf ∈ [240, 2000] Hz. Analysis of GW170817 (H1+L1) and GW190425 (L1) using GWOSC public data. Non-detection consistent with O2/O3 sensitivity limits. First CCEGA-specific 3σ upper limits established. Does not falsify CCEGA. Definitive test: Einstein Telescope ~2035.
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Marc López Sánchez (2026) studied this question.
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