Warm dark matter (WDM) is a hypothesized form of dark matter that has properties intermediate between those of hot dark matter and cold dark matter, causing structure formation to occur bottom-up from above their free-streaming scale, and top-down below their free streaming scale. The most common WDM candidates are sterile neutrinos and gravitinos. The WIMPs (weakly interacting massive particles), when produced non-thermally could be candidates for warm dark matter. In general, however the thermally produced WIMPs are cold dark matter candidates.
Sinziana Paduroiu: The Dark Universe - Dark Matter Models in Theory, Simulations and Observations
References
Dark Matter: Not Simply a Questions of MACHOS and WIMPS
More than meets the eye
Constraining warm dark matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-α forest
The first star formation in WDM Universe
W.B. Lin, D.H. Huang, X. Zhang, R. Brandenberger, Non-Thermal Production of WIMPs and the Sub-Galactic Structure of the Universe Phys. Rev. Lett. 86, 954, 2001.
See also
Dark matter
Hot dark matter (HDM)
Cold dark matter (CDM)
Lambda-CDM model
Modified Newtonian Dynamics
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