Abstract
Post recombination density perturbations have been studied in a two-component matter-radiation universe. The study has been carried out for variable matter and radiation densities. The possibility of the existence of different kinds of neutrinos in addition to the electronic, muonic and taonic has been considered and conclusions have been drawn as to the upper limit of the radiation density for different values of Ω m .
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Sahni, V. Massless particles and cosmology. Pramana - J Phys 15, 423–434 (1980). https://doi.org/10.1007/BF02847881
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DOI: https://doi.org/10.1007/BF02847881