A generalized inflation model with cosmic gravitational waves
  We propose a $\Lambda$-inflation model which explains a large fraction of the COBE signal by cosmic gravitational waves. The primordial density perturbations fulfil both the contraints of large-scale microwave background and galaxy cluster normalization. The model is tested against the galaxy cluster power spectrum and the high-multipole angular CMB anisotropy. 
V.N.Lukash (1), E.V.Mikheeva (1), V. M\"uller (2), A.M. Malinovsky (1)   ((1) - Astro Space Center of P.N.Lebedev Physical I...