Abstract
The possibility that the deceleration parameter q might be a null constant is discussed; such possibilitiy is interesting because solves the horizon problem and the flatness problem with no need of inflation. A simple way to get q = const = 0 is explored: the way assumes Einstein's field equations without cosmological term and introduces a massless scalar field V with negative energy density. Both in the early and in the present universe one finds the Whitrow-Randall relation Gut2 = const 1 G gravitational coupling, u mass-energy density, t cosmic time). The interaction between the V-field and the ordinary matter is briefly discussed; as possible consequence of this interaction the true value of the Hubble parameter might be one half the observed value.
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Massa, C. Relativistic Cosmology with Zero Deceleration Parameter. Astrophysics and Space Science 253, 285–289 (1997). https://doi.org/10.1023/A:1000647602066
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DOI: https://doi.org/10.1023/A:1000647602066