Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-08-15
Phys.Rev.D52:4295-4306,1995
Astronomy and Astrophysics
Astrophysics
31 pp. Forthcoming in Physical Review D. Section 3 significantly revised. Four figures not included; hard copies available fro
Scientific paper
10.1103/PhysRevD.52.4295
Primordial spectral indices are calculated to second order in slow-roll parameters for three closely-related models of inflation, all of which contain a scalar field non-minimally coupled to the Ricci curvature scalar. In most cases, $n_s$ may be written as a function of the non-minimal curvature coupling strength $\xi$ alone, with $n_s (\xi) \leq 1$, although the constraints on $\xi$ differ greatly between \lq new inflation' and \lq chaotic inflation' initial conditions. Under \lq new inflation' initial conditions, there are discrepancies between the values of $n_s$ as calculated in the Einstein frame and the Jordan frame. The sources for these discrepancies are addressed, and shown to have negligible effects on the numerical predictions for $n_s$. No such discrepancies affect the calculations under \lq chaotic inflation' initial conditions.
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