1992 (IPP)
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Item Constraints on the shape of the density spectrum from COBE and galaxy surveys(2014-11-23) Padmanabhan, T.; Narasimha, D.Item Zeldovich approximation and the probability distribution for the smoothed density field in the nonlinear regime(2014-11-23) Padmanabhan, T.; Subramanian, KandaswamyThe study of large-scale structure in the Universe is often based on the observed density distribution of matter smoothed by a suitable filter function. The probability distribution for this smoothed density field in the nonlinear regime is studied using the Zeldovich approximation. When the shear term of the velocity field is not too large, one can obtain a reasonably good analytic approximation to this probability distribution. The properties of this distribution are discussed and compared with other attempts along similar lines.Item Neutral hydrogen at high redshifts as a probe of structure formation : 1. Post COBE analysis of CDM and HDM models(2014-11-23) Subramanian, Kandaswamy; Padmanabhan, T.