Abstract
Guth’s inflationary Universe scenario has revolutionized our thinking about the very early Universe. The inflationary scenario offers the possibility of explaining a handful of very fundamental cosmological facts—the homogeneity, isotropy, and flatness of the Universe, the origin of density inhomogeneities and the origin of the baryon asymmetry, while at the same time avoiding the monopole problem. It is based upon microphysical events which occurred early (t ≤ 10-34 sec) in the history of the Universe, but well after the planck epoch (t ≥ 10-43 sec). While Guth’s original model was fundamentally flawed, the variant based on the slow-rollover transition proposed by Linde, and Albrecht and Steinhardt (dubbed ‘new inflation’) appears viable. Although old inflation and the earliest models of new inflation were based upon first order phase transitions associated with spontaneous-symmetry breaking (SSB), it now appears that the inflationary transition is a much more generic phenomenon, being associated with the evolution of a weakly-coupled scalar field which for some reason or other was initially displaced from the minimum of its potential. Models now exist which are based on a wide variety of microphysics: SSB, SUSY/SUGR, compactification of extra dimensions, R2 gravity, induced gravity, and some random, weakly-coupled scalar field. While there are several models which successfully implement the inflation, none is particularly compelling and all seem somewhat ad hoc. The common distasteful feature of all the successful models is the necessity of a small dimensionless number in the model—usually in the form of a dimensionless coupling of order 10-15. And of course, all inflationary scenarios rely upon the assumption that vacuum energy (or equivalently a cosmological term) was once dynamically very significant, whereas today there exists every evidence that it is not (although we have no understanding why it is not). For these reasons I have entitled these lectures Toward the Inflationary Paradigm. I have divided my lectures into the following sections: Successes of the standard cosmology; Shortcomings of the standard cosmology; New inflation—the slow-rollover transition; Scalar field dynamics; Origin of density inhomogeneities; Specific models, I. Interesting failures; Lessons learned—prescription for successful inflation; Two models that work; The Inflationary paradigm; Loose ends; and Inflation confronts observation.
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Turner, M.S. (1988). Toward the Inflationary Paradigm: Lectures on Inflationary Cosmology. In: Galeotti, P., Schramm, D.N. (eds) Gauge Theory and the Early Universe. NATO ASI Series, vol 248. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3059-9_2
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