![]() ![]() We therefore have demonstrated that before imposing any constraint from the invisible Higgs decay width, the singlet scalar can be a subdominant DM from 0 to 100. The researcher's study is based on M theory, or 'the theory of everything', which attempts to unite the cause of all matter. ![]() ![]() This thesis compiles the results of six works which deal with - inflationary model building and estimation of cosmological parameters from various field theoretic setup, quantification of reheating temperature, studies of leptogenesis in braneworld and estimation of primordial non-Gaussianity from $=1$ supergravity framework.In particular we study the nonlinear evolution of cosmological perturbations on large scales which enable us to compute the curvature perturbation, without solving the exact perturbed field equations.Hence we compute the various non-Gaussian parameters for local type of non-Gaussianities, for a generic class of sub-Planckian models dominated by the Hubble-induced corrections. As seen in figure 5, we find regions of the parameter space that the singlet scalar covers from 0 to 100 of the DM relic density in a range of DM mass 6130 GeV. Higgs mechanism or Spontaneous Symmetry Breaking gives masses without violating guage invariance. The singlet, a highly technical term to describe the particle that doesn't interact with matter in the usual way, and boson are both named after theoretical physicist Peter Higgs. ![]()
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