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Astronomy · L5 · Evidence for Dark Matter and Candidate Particles

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

Astronomy
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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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