We present a successful inflation model based on \lambda \phi ^ { 4 } potential in which a Standard Model ( SM ) singlet inflaton \phi , 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 .