Browsing by Author "Canuto, V. M."

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    Cosmological tests of the Hoyle-Narlikar conformal gravity
    (American Astronomical Society, 1980-02-15) Canuto, V. M.; Narlikar, J. V.
    For the first time we subject the Hoyle-Narlikar theory with creation of matter and a variable gravitational constant G, to the following cosmological tests: the magnitude versus z relation, the N(m) versus m relation, the metric angular diameters versus z relation, the isophotal angles versus z relation, the log N-log S radio source count, and finally the 3 K radiation. It is shown that the theory passes all these tests just as well as the standard cosmology, with the additional advantage that the geometry of the universe is uniquely determined, with k = 0. It is also interesting to note that the variability of G affects the log N-log S curve in a way similar to the density evolution introduced in standard cosmologies. The agreement with the data is therefore achieved without recourse to an ad hoc density evolution.
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    Diffuse gamma-ray background in the Hoyle-Narlikar cosmology
    (European Southern Observatory, 1980-04-24) Canuto, V. M.; Owen, J. R.; Narlikar, J. V.
    In this paper we analyze the contribution of QSO's, BL-Lac's and Seyfert galaxies to the diffuse gamma-ray background within the framework of the Hoyle-Narlikar theory. It is shown that the inconsistency reported in standard theory, namely that the evolutionary function needed to explain the gamma-ray data is very different from the one derived from the optical part of the spectrum, is no longer present. It is also shown that the contribution of a variable gravitational "constant" to the expression for the diffuse background is the same as that of a density evolution function.