Transient de Sitter and Quasi de Sitter States in SO(32) and E_8 x E_8 Heterotic String Theories

TL;DR

This paper constructs novel de Sitter and quasi de Sitter states in heterotic string theories, revealing emergent positive dark energy with slow temporal variation, and offers a framework for embedding the Standard Model in such backgrounds.

Contribution

It introduces dynamical duality-sequences for constructing stable de Sitter states in heterotic string theories, incorporating perturbative and non-perturbative effects systematically.

Findings

Positive dark energy emerges from Borel resummation of Gevrey series.

Framework handles equations of motion, flux quantization, and anomaly cancellations consistently.

Provides a setup for embedding Standard Model degrees of freedom in a realistic string-theoretic background.

Abstract

One of the long-standing puzzles in string theory has been on the existence of a four-dimensional de Sitter and quasi de Sitter configurations, the latter being defined with a temporally varying dark energy, in E_8 x E_8 and SO(32) heterotic theories. In this work, novel dynamical duality-sequences are devised that provide natural constructions of de Sitter and quasi de Sitter excited states in the aforementioned theories allowing no late-time singularities. The emergent positive dark energies -- including the intriguing possibility of their slow temporal variations -- appear from Borel resumming Gevrey series from the path-integral representations of such states. Additionally, precise ways to handle the equations of motion, Bianchi identities, flux quantizations and anomaly cancellations -- consistent with the underlying axionic cosmology, with the temporal dependence, and with the probability of forming wormholes that connect baby universes -- are presented for the SO(32) and the E_8 x E_8 theories within a framework that systematically incorporates perturbative and non-perturbative corrections in the far infrared. The temporally varying dark energy, which is much more natural in our set-up because of its emergent nature, surprisingly simplifies many of the aforementioned computations. Interestingly, our analysis also provides, probably for the first time, a set-up to consistently embed four-dimensional standard model degrees of freedom at late time in a realistic gravitational background with positive dark energy from string theory.