Time Since the Beginning

Details Time Since the Beginning Time Since the Beginning

2003-01-13

arxiv.org/abs/astro-ph/0301199v1

Astrophysical Ages and Time Scales," Astronomical Society of the Pacific Conference Series, vol. 245, pp. 3-17 (2001)

Astronomy and Astrophysics

Astrophysics

13 pages, including 4 figures, LaTeX 2.09, attached style file AATS2.sty required. Review talk given at "Astrophysical Ages an

Scientific paper

While there is no consensus about the history of time since the beginning, in this paper I will discuss some possibilities. We have a pretty clear picture of cosmic history from the electroweak phase transition through the time of recombination, a period which includes the QCD phase transition and big bang nucleosynthesis. This paper includes a quantitative discussion of the age of the universe, of the radiation-matter transition, and of hydrogen recombination. There is much evidence that at earlier times the universe underwent inflation, but the details of how and when inflation happened are still far from certain. There is even more uncertainty about what happened before inflation, and how inflation began. I will describe the possibility of ``eternal'' inflation, which proposes that our universe evolved from an infinite tree of inflationary spacetime. Most likely, however, inflation can be eternal only into the future, but still must have a beginning.

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