Higgs inflation

Abstract

In this thesis, we have investigated the possibility that the Stan-dard Model Higgs boson playing the role of inflaton. A standard λΦ4 potential requires an unphysically small coupling constant (λ ~10-13) to obtain density perturbations in agreement with observational data. A large coupling between the scalar feild and the Ricci curvature scalar relaxes this condition, and the field Φ might be identi ed with the Standard Model Higgs eld. In such a model, the predicted values of the spectral index and the tensor-to-scalar ratio are also in agreement with current ob- servational data. However, quantum corrections seem to break the theory down at the cut-off scale ~ MPl/ Σ which is below the energy scale where inflation takes place. By the extension of standard model, we solved the unitarity problem associated with the Higgs Ination. We examine the possibility of minimal Higgs Ination via the modi cation of potential.,