Cosmic Microwave Background from Late-Decaying Scalar Condensations

Abstract

We study the cosmic microwave background (CMB) anisotropy in the scenario with late-decaying scalar condensations which arise in many class of cosmological scenarios based on supersymmetric models. With such a scalar condensation ϕ, the CMB radiation we observe today originates to ϕand hence the CMB anisotropy is affected if ϕhas a primordial fluctuation. In particular, if all the components in the universe (i.e., radiation, baryon, cold dark matter, and so on) are generated from the decay product of ϕ, the dominant source of the cosmic density perturbations can be the primordial fluctuation of ϕ, not the fluctuation of the inflaton field. In this case, the constraints on the inflation models can be drastically relaxed. In other case, the baryon or the CDM may not be from the decay product of ϕand correlated mixture of the adiabatic and isocurvature fluctuations can be generated. If so, the CMB angular power spectrum may not be the same as the adiabatic result and the on-going MAP experiment may observe a deviation from the prediction of the standard inflationary scenario.