Gravitational waves

Description

Panel (a) shows the raw gravitational‑wave strain, dominated by detector noise yet containing the faint chirp signal. Panel (b) overlays the cleaned chirp recovered by matched filtering, clearly illustrating the rising amplitude that culminates at the merger indicated by a vertical dashed line at t = 0. Panel (c) plots the instantaneous frequency, which increases smoothly from ≈30 Hz to a peak of ≈450 Hz just before merger, confirming the expected chirp evolution of a binary black‑hole coalescence.

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