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[en] An outline is given that estimates the expected gravitational wave background, based on plausible pregalactic sources. Some cosmologically significant limits can be put on incoherent gravitational wave background arising from pregalactic cosmic evolution. The spectral region of cosmically generated and cosmically limited radiation is, at long periods, P greater than 1 year, in contrast to more recent cosmological sources, which have P approx. 10 to 10(exp -3)

[en] A survey is made of the standard model of nucleosynthesis, and of the various ways that the standard model can be modified to break the relation between He-4 and lighter isotope production. It has been suggested that the agreement with predictions of H-2, He-3, and He-4 is strained because He-4 abundances are observed to be about as low as allowed by the standard model. The authors thus investigate whether remotely plausible effects could lower the model prediction of He-4. It is found that only two: a variable gravitational constant, smaller during nucleosynthesis, and a nonzero neutrino number. 28 references

[en] Extant models to explain the observed anisotropies in the microwave and x-radiation background have been of the clump type: the earth is falling toward a density enhancement of large scale in an otherwise homogeneous cosmology. We present here alternate models in which the anisotropies are true relics of the very early history of the universe, and in which the microwave dipole observations in particular are the result of amplification mechanisms in essentially homogeneous models. One of the models considered is an open, slightly anisotropic universe with very small density. It predicts, apparently consistently with observations, quadrupole x-ray anisotropy together with dipole microwave anisotropy

[en] Perturbations of black holes (Schwarzschild, Reissner-Nordstrom and Kerr) can be treated by simple radial wave equations. It is shown that the massless scalar radial equation is a form of the spin-weighted spheroidal wave equation. The region in r corresponding to the usual angular argument (cos theta, theta real) for such functions is the black hole interior, r epsilon rsub(-), rsub(+) where rsub(-), rsub(+) are the inner and outer horizon radii respectively Axisymmetric scalar waves only are considered. In these cases the spin-weighted spheroidal harmonics correspond to imaginary-frequency waves, i.e. to exponentially growing or decaying waves that fall inward across the outer horizon rsub(+) and are converted to waves moving in the opposite direction as they cross the rsub(-)-horizon (r is a timelike coordinate when r epsilon rsub(-), rsub(+)). These modes are exactly analogous to the external quasi-normal modes of the black hole. There is always one zero-frequency mode, and l non-zero imaginary-frequency modes. Here l is the angular momentum eigen-number associated with the angular decomposition. (author)

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[en] Massive neutrinos role in the early development of the expanding universe's density inhomogeneities would obviate simultaneous consistency with microwave isotropy observations, missing mass observations, and the nucleosynthesis prediction for the current baryon density. Three- and one-dimensional process calculations for an initially slightly inhomogeneous cosmology indicate, in the former case, a structure similar to the voids/pancake/string of large galactic clusters, and in the latter case, consistency is found between the results obtained and galaxy formation in a neutrino-initiated pancake collapse. 55 references