Singularities in Inflationary Cosmology: A Review

Details Singularities in Inflationary Cosmology: A Review Singularities in Inflationary Cosmology: A Review

1996-12-15

arxiv.org/abs/gr-qc/9612036v1

Int.J.Mod.Phys. D5 (1996) 813-824

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Plain TeX. Twelve pages, five figures (that will automatically appear if you use "dvips" to print the file)

Scientific paper

10.1142/S0218271896000497

We review here some recent results that show that inflationary cosmological models must contain initial singularities. We also present a new singularity theorem. The question of the initial singularity re-emerges in inflationary cosmology because inflation is known to be generically future-eternal. It is natural to ask, therefore, if inflationary models can be continued into the infinite past in a non-singular way. The results that we discuss show that the answer to the question is ``no.'' This means that we cannot use inflation as a way of avoiding the question of the birth of the Universe. We also argue that our new theorem suggests - in a sense that we explain in the paper - that the Universe cannot be infinitely old.

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