WIMP Dark Matter Inflation with Observable Gravity Waves

Abstract

We present a successful inflation model based on $\lambda {\varphi }^4$ potential in which a Standard Model (SM) singlet inflaton $\varphi$, with mass of around a TeV or less, also plays the role of a weakly interacting scalar dark matter particle (WIMP). The WIMP relic abundance generated after inflation is in accord with the current observations. The spectral index $n_s$ lies within the WMAP 1-$\sigma$ bounds, while the Planck satellite may observe the tensor-to-scalar ratio, a canonical measure of gravity waves, which we estimate lies between 0.003 and 0.007.An unbroken $Z_2$ parity ensures that the scalar WIMP is absolutely stable.

Comments: 4 pages, 2 figures, Note Added which includes a brief discussion of two previous works on the same model considered in our paper