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- W1978334944 abstract "In search of non-inflationary cosmological models that do not suffer from the horizon and the entropy problems of the standard hot big-bang model, we present two exact cosmological solutions to Einstein's equations based on a homogeneous scalar field with an exponential potential. The curvature constant k is -1 and 0 in these solutions. The model universe of these solutions is singular, causally connected, entropy-conserving and devoid of matter. We extend these solutions to the more realistic case of a universe in which radiation and non-relativistic matter are created through the decay of the homogeneous scalar field. The energy density of the scalar field as well as those of the radiation and non-relativistic matter vary with time as . The initial entropy of the universe is zero and created as the scalar field decays into radiation. The variation of the energy densities guarantees a successful cosmic helium synthesis which is essentially indistinguishable from that in the standard hot big-bang model. We discuss other aspects of these models and argue that they are viable singular models, free of some of the problems of the standard model." @default.
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- W1978334944 date "1998-01-01" @default.
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- W1978334944 title "Singular scalar field cosmologies with energy density decaying as" @default.
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- W1978334944 doi "https://doi.org/10.1088/0264-9381/15/1/007" @default.
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