Primordial Density Fluctuations in a Dual Supergravity Cosmology

TL;DR

This paper investigates the spectrum of primordial density fluctuations within a dual supergravity framework, demonstrating stabilized moduli, successful inflation inside domain walls, and near scale-invariant tensor perturbations, with parameter constraints derived from COBE data.

Contribution

It introduces a dual supergravity model with stabilized dilaton and moduli that achieves inflation inside domain walls, analyzing its fluctuation spectrum and observational constraints.

Findings

Primordial density fluctuation spectrum analyzed in a dual supergravity context.

Constraints on superpotential parameters derived from COBE data.

Tensor perturbations exhibit nearly scale-invariant behavior.

Abstract

We analyse the spectrum of energy density fluctuations of a dual supergravity model where the dilaton and the moduli are stabilized and sucessful inflation is achieved inside domain walls that separate different vacua of the theory. Constraints on the parameters of the superpotential are derived from the amplitude of the primordial energy density fluctuations as inferred from COBE and it is shown that the scale dependence of the tensor perturbations nearly vanishes.