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We consider a cosmological scenario where a relativistic particle and astable massive particle are simultaneously produced from the decay of alate-decaying particle after Big-Bang Nucleosynthesis but beforematter-radiation equality. The relativistic and massive particles behave asdark radiation and warm dark matter, respectively. Due to a common origin, thewarmness and abundances are closely related. We refer to the models that leadto such a scenario as Common Origin of Warm and Relativistic Decay Products(COWaRD). We show that COWaRD predicts a correlation between the amount of darkradiation and suppression of the large scale structure, which can be tested infuture precision cosmology observations. We demonstrate that COWaRD isrealized, as an example, in a class of supersymmetric axion models and thatfuture observations by the next generation Cosmic Microwave Background, LargeScale Structure, and 21-cm surveys can reveal the structure of the theory.

Common Origin of Warm Dark Matter and Dark Radiation