We consider non-minimal \lambda \phi ^ { 4 } inflation in a gauged non-supersymmetric U ( 1 ) _ { B - L } model containing the gravitational coupling \xi \mathcal { R } \Phi ^ { \dagger } \Phi , where \mathcal { R } denotes the Ricci scalar and the standard model singlet inflaton field \Phi spontaneously breaks the U ( 1 ) _ { B - L } symmetry .
Including radiative corrections , the predictions 0.956 \lesssim n _ { s } \lesssim 0.984 and 0.007 \lesssim r \lesssim 0.1 for the scalar spectral index and tensor to scalar ratio r lie within the current WMAP 1- \sigma bounds .
If the B - L symmetry breaking scale is of order a TeV or so , one of the three right handed neutrinos is a plausible cold dark matter candidate .
Bounds on the dimensionless parameters \lambda , \xi and the gauge coupling g _ { B - L } are obtained .