Browsing by Author "Apparao, K. M. V."

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    High energy radiation from white holes
    (Nature Publishing Group, 1974-10-18) Narlikar, J. V.; Apparao, K. M. V.; Dadhich, Naresh
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    Massive oscillators as cosmic energy sources
    (Kluwer Academic Publishers, 1982-01-18) Apparao, K. M. V.; Narlikar, J. V.
    The usual picture in which a massive object undergoes a gravitational collapse to become a black hole and ultimately end up in space-time singularity, is modified with the introduction of a negative energy force of repulsion effective only at a short range. It is shown that the object executes oscullations between states of high and low densities. From the view point of high energy astrophysics, such a massive oscillator combines some of the attractive features of black holes and white holes. It is suggested that the energy production and spectral features of quasars, BL-Lacs and the active galactic nuclei might be accounted for by postulating the existence of massive oscillators.
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    Nucleosynthesis in bouncing cosmologies
    (Kluwer Academic Publishers, 1982-05-06) Narlikar, J. V.; Apparao, K. M. V.
    It is shown that certain anomalies connected with the primordial abundances of light nuclei may be resolved if it is assumed that the Universe oscillates between phases of finite densities. Since general relativity does not produce bouncing models of the Universe, such models are obtained through the introduction of a negative energy scalar field of zero rest mass. It is shown that all the relevant parameters of the dynamics of the model and the nucleosynthesis in it are determined by observations and that a self-consistent picture emerges. The model is capable of admitting more than three neutrino flavours without an embarrassingly high primordial helium content. It is also shown that the calculations could be adapted to described production of light nuclei in compact massive bouncing objects.
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    White holes and high energy astrophysics
    (Kluwer Academic Publishers, 1975-01-01) Narlikar, J. V.; Apparao, K. M. V.
    The role of exploding objects in high-energy astrophysics is discussed. Quantitative results are obtained for the simple case of the canonical white hole which explodes from a singularity and consists of pressure-free matter in the comoving frame of reference. General relativity is used for calculating the dynamical results. Applications to X-ray background, transient X-ray sources, gamma-ray bursts, and high energy cosmic rays are considered. White holes of more general types are discussed in a qualitative manner.