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GW190521: Echoes from a Parallel Universe?
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Could the puzzling GW190521 event be more than a standard binary black hole merger? We unpack the strange short signal, the mass-gap mystery, and the missing inspiral, then dive into a radical wormhole-echo hypothesis that a merger in another universe left a ringdown echo in ours. We compare the conventional merger model with the exotic scenario using SNR and Bayesian evidence, explore the ZTF flare hint, and discuss what this could imply about exotic matter and physics beyond the standard model.
Source: https://arxiv.org/abs/2509.07831
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