Singularity structure in Veneziano's model

TL;DR

This paper investigates the nature of the cosmological singularity in Veneziano's inflationary model, revealing an arbitrary initial data problem and a domain-structured, anisotropic universe near the singularity.

Contribution

It demonstrates the unresolved initial data problem and the emergence of a domain-structured, anisotropic universe in Veneziano's model.

Findings

Initial data in the model is not uniquely determined.

The universe near the singularity has a domain structure.

Each domain exhibits anisotropic expansion.

Abstract

We consider the structure of the cosmological singularity in Veneziano's inflationary model. The problem of choosing initial data in the model is shown to be unsolved -- the spacetime in the asymptotically flat limit can be filled with an arbitrary number of gravitational and scalar field quanta. As a result, the universe acquires a domain structure near the singularity, with an anisotropic expansion of its own being realized in each domain.