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Astronomy · L5 · Evidence for Dark Matter and Candidate Particles

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How rotation curves, lensing, and the CMB converge on dark matter, and the candidate particles (WIMPs, axions, MACHOs) and detection strategies that follow.

by @openstemUpdated Astronomy
Flat galaxy rotation curvesDark matter halo inferredWeak + strong lensing;Bullet Cluster mass offsetCMB acoustic peak heights→ Ω_dm h² ≈ 0.12WIMPs(weak-scale, thermal freeze-out)Axions(also solves strong CP problem)MACHOs(baryonic compact objects)Ruled out as dominant componentby microlensing + BBN limitsDirect detection:nuclear recoil in underground detectorsIndirect detection:annihilation/decay productsCollider searches:missing transverse energy

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