On the gravitational waves on the background of anomaly-induced inflation

TL;DR

This paper investigates gravitational wave production during anomaly-induced inflation, showing that the resulting perturbation spectrum aligns with observational data and is similar to conventional inflaton models.

Contribution

It provides the first calculation of gravitational waves in anomaly-induced inflation, linking quantum matter effects to observable cosmological signatures.

Findings

Perturbation spectrum matches COBE data.

Gravitational wave characteristics are similar to standard inflaton models.

Quantum vacuum effects drive stable inflation without traditional inflaton fields.

Abstract

In the very 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. However, in this situation the vacuum effects of quantum matter fields become important. The vacuum effective action depends, essentially, on the particle content of the underlying gauge model. 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 gauge model (which favor extended or supersymmetric versions of the Standard Model rather than the minimal one), one arrives at the stable inflation. In this article we report about the calculation of the gravitational waves in this model. 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.