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Does inflation necessarily imply Ω=1?

by: G. F. R. Ellis
Classical and Quantum Gravity, Vol. 5, No. 6. (01 January 1999), 891, doi:10.1088/0264-9381/5/6/010  Key: citeulike:11192205

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Abstract

It is usually stated that, if a universe undergoes a period of significant exponential expansion ('inflation'), then necessarily at the present time we live in a high-density universe with the density parameter Omega very close to the critical value of 1. However, this is not necessarily so; there exist inflationary universes leading to any desired value whatever for the present-day value of Omega , and which furthermore also solve both the horizon and monopole problems. Thus inflation is compatible both with very high-density and with very low-density universes. Furthermore, different approaches to looking at the probability of inflationary universe models suggest it may not even be particularly probable that inflation leads to a universe which is presently near the critical density.


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