A crucial ingredient of inflation

Details A crucial ingredient of inflation A crucial ingredient of inflation

2000-09-08

arxiv.org/abs/hep-th/0009053v1

Int.J.Theor.Phys. 40 (2001) 2259-2294

Physics

High Energy Physics

High Energy Physics - Theory

42 pages, LaTeX. Talk given at the conference ''Recent Developments in Gravitation, Cosmology and Quantum Field Theory, Peyres

Scientific paper

Nonminimal coupling of the inflaton field to the Ricci curvature of spacetime is generally unavoidable, and the paradigm of inflation should be generalized by including the corresponding term in the Lagrangian of the inflationary theory. This paper reports on the status of the programme of generalizing inflation. First, the problem of finding the correct value (or set of values) of the coupling constant is analyzed; the result has important consequences for the success or failure of inflationary scenarios. Then, the slow-roll approximation to generalized inflation is studied. Both the unperturbed inflating universe models and scalar/tensor perturbations are discussed, and open problems are pointed out.

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