Shock-to-shock distances in double radio relic clusters serve as a merger chronometer to set a 68% upper limit of sigma/m < 0.22 cm²/g on dark matter self-interaction, marginalizing over mass, angle, speed, phase, impact parameter, and gas slope.
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Simulations indicate LISA could statistically distinguish CDM from SIDM (constant 1 cm²/g cross-section) with at least ~70 high-SNR massive black hole merger detections.
citing papers explorer
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A New Robust Constraint on the Self-interaction Cross-section of Dark Matter with Double Radio Relic Clusters
Shock-to-shock distances in double radio relic clusters serve as a merger chronometer to set a 68% upper limit of sigma/m < 0.22 cm²/g on dark matter self-interaction, marginalizing over mass, angle, speed, phase, impact parameter, and gas slope.
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Probing the Nature of Dark Matter Self-Interactions Through Observations of Massive Black Hole Mergers
Simulations indicate LISA could statistically distinguish CDM from SIDM (constant 1 cm²/g cross-section) with at least ~70 high-SNR massive black hole merger detections.