Binary Collisions of Dark Matter Blobs

Abstract

We describe the model-independent mechanism by which dark matter and dark matter structures heavier than $\sim 8\times 10^{11}$ GeV form binary pairs in the early Universe that spin down and merge both in the present and throughout the Universe's history, producing potentially observable signals. Sufficiently dense dark objects will dominantly collide through binary mergers instead of random collisions. We detail how one would estimate the merger rate accounting for finite size effects, multibody interactions, and friction with the thermal bath. We predict how mergers of dark dense objects could be detected through gravitational and electromagnetic signals, noting that such mergers could be a unique source of high frequency gravitational waves. We rule out objects whose presence would contradict observations of the CMB and diffuse gamma-rays.

16 pages, 3 figures Comments added on properties needed for blobs to merge as predicted

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Cited by in corpus (8)

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• Gravitational and electromagnetic radiation from binary black holes with electric and magnetic charges: Hyperbolic orbits on a cone
• Searching for High Frequency Gravitational Waves with Phonons
• Dark Matter Candidates and Searches
• Dissipative Dark Cosmology: From Early Matter Dominance to Delayed Compact Objects
• The Effect of Multiple Cooling Channels on the Formation of Dark Compact Objects
• Fireball anti-nucleosynthesis
• Picolensing as a Probe of Primordial Black Hole Dark Matter