Physics – General Physics
Scientific paper
2011-04-19
Astrophys Space Sci (2012) 337:367-372
Physics
General Physics
13 pages
Scientific paper
10.1007/s10509-011-0806-7
Combining the kinematical definitions of the two dimensionless parameters, the deceleration q(x) and the Hubble t0H(x), we get a differential equation (where x = t/t0 is the age of the universe relative to its present value t0). First integration gives the function H(x). The present values of the Hubble parameter H(1) [approximately t0H(1) \approx 1], and the deceleration parameter [approximately q(1)\approx - 0.5], determine the function H(x). A second integration gives the cosmological scale factor a(x). Differentiation of a(x) gives the speed of expansion of the universe. The evolution of the universe that results from our approach is: an initial extremely fast exponential expansion (inflation), followed by an almost linear expansion (first decelerated, and later accelerated). For the future, at approximately t \approx 3t0 there is a final exponential expansion, a second inflation that produces a disaggregation of the universe to infinity. We find the necessary and sufficient conditions for this disaggregation to occur. The precise value of the final age is given only with one parameter: the present value of the deceleration parameter q(1) \approx - 0.5]. This emerging picture of the history of the universe represents an important challenge, an opportunity for the immediate research on the Universe. These conclusions have been elaborated without the use of any particular cosmological model of the universe.
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