Anomaly-Induced Effective Action and Inflation

TL;DR

This paper discusses how conformal trace anomaly can induce stable inflation in the early universe, with gravitational wave predictions aligning with COBE data, especially under extended or supersymmetric particle models.

Contribution

It reviews the anomaly-induced inflation model and reports calculations of gravitational wave spectra consistent with observational data.

Findings

Gravitational wave spectrum similar to inflaton models

Stable inflation achieved with conformal anomaly effects

Results compatible with COBE measurements

Abstract

In the early Universe matter can be described as a conformal invariant ultra-relativistic perfect fluid, which does not contribute, on classical level, to the evolution of the isotropic and homogeneous metric. If we suppose that there is some desert in the particle spectrum just below the Planck mass, then the effect of conformal trace anomaly is dominating at the corresponding energies. With some additional constraints on the particle content of the underlying gauge model (which favor extended or supersymmetric versions of the Standard Model rather than the minimal one), one arrives at the stable inflation. We review the model and report about the calculation of the gravitational waves on the background of the anomaly-induced inflation. The result for the perturbation spectrum is close to the one for the conventional inflaton model, and is in agreement with the existing Cobe data (see also [hep-th/0009197]).