DR. DHIRAJ HAZRA

Parameter estimations in cosmology is always biased by the assumptions regarding the underlying model. Usually the standard model of cosmology assumes power law model of primordial power spectrum and LCDM background cosmology. Relaxing one of these assumptions result in increased degeneracies and larger uncertainties in the parameter space. Use of different estimators and different datasets can reduce these degeneracies to a considerable extent. In this talk the speaker shall discuss, to what extent the assumptions bias our understanding of the Universe. Moreover it is always important to ask whether the observational data indicate some deviations from the standard model. Using different approaches I shall address this question, in particular in the context of power spectrum of temperature anisotropy in the Cosmic Microwave Background. Towards the end the speaker shall demonstrate the consistency of the standard model assumptions with the recent observational data.