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Eternal Universe
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We discuss cosmological models for an eternal universe. Physical observables show no singularity from the infinite past to the infinite future. While the universe is evolving, there is no beginning and no end - the universe exists forever. The early state of inflation is described in two different, but equivalent pictures. In the freeze frame the universe emerges from an almost static state with flat geometry. After entropy production it shrinks and "thaws" slowly from a "freeze state" with extremely low temperature. The field transformation to the second "big bang picture" (Einstein frame) is singular. This "field singularity" is responsible for an apparent singularity of the big bang. Furthermore, we argue that past-incomplete geodesics do not necessarily indicate a singularity or beginning of the universe. Proper time ceases to be a useful concept for physical time if particles become massless. We propose to define physical time by counting the number of zeros of a component of the wave function. This counting is independent of the choice of coordinates and frames, and applies to massive and massless particles alike.
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Cited by 1 Pith paper
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Dilaton-induced variations in Planck constant and speed of light: An alternative to Dark Energy
The paper assigns dilaton-dependent ℏ and c in a scale-invariant fermion-gauge action, derives a τ∝l^{3/2} time scaling, and claims this replaces dark energy, with the supernova fit deferred to a companion paper.
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