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Cosmic microwave background (CMB) anisotropies and density uctuations are calculated for at cold dark matter (CDM) models with a wide range of parameters , i.e., 0 ; h and B for both standard recombination and various epochs of reionization. Tables of the power spectrum of CMB anisotropies in the form of C ` 's as a function ofàre presented. Although the(More)
We classify the future of the universe for general cosmological models including matter and dark energy. If the equation of state of dark energy is less then −1, the age of the universe becomes finite. We compute the rest of the age of the universe for such universe models. The behaviour of the future growth of matter density perturbation is also studied.(More)
The origin of the substantial magnetic fields that are found in galaxies and on even larger scales, such as in clusters of galaxies, is yet unclear. If the second-order couplings between photons and electrons are considered, then cosmological density fluctuations, which explain the large-scale structure of the universe, can also produce magnetic fields on(More)
The late-time entropy production by the massive particle decay induces the various cosmological effects in the early epoch and modify the standard scenario. We investigate the thermalization process of the neutrinos after the entropy production by solving the Boltzmann equations numerically. We find that if the large entropy are produced at t ∼ 1 sec, the(More)