We measure the “warmness” of the dark matter, i.e. the comoving root-mean-square thermal velocity
, with nearly 3000 spiral galaxy rotation curves in the PROBES catalog. The results are
m/s if dark matter is collisional, or
m/s if dark matter is collisionless. These results are in agreement with previous measurements of
, and with independent measurements of the linear density power spectrum cut-off wavevector
due to free-streaming, but are in disagreement with limits. This disagreement is not currently understood.
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