Issues in Type IIA Uplifting

TL;DR

This paper investigates the potential of F-term uplifting to convert AdS vacua into dS vacua in type IIA string theory, finding it unsuccessful and highlighting ongoing challenges in achieving positive cosmological constants.

Contribution

It provides a detailed analysis showing that F-term uplifting does not succeed in producing dS vacua in a simplified type IIA model, emphasizing the difficulty of obtaining phenomenologically viable vacua.

Findings

F-term uplifting fails to produce dS vacua in the model.

No analogs of anti-D3 brane or D-terms identified for uplifting.

Highlights the challenge of achieving positive cosmological constant in type IIA.

Abstract

Moduli stabilization in the type IIA massive string theory so far was achieved only in the AdS vacua. The uplifting to dS vacua has not been performed as yet: neither the analogs of type IIB anti-D3 brane at the tip of the conifold, nor the appropriate D-terms have been identified. The hope was recently expressed that the F-term uplifting may work. We investigate this possibility in the context of a simplified version of the type IIA model developed in hep-th/0505160 and find that the F-term does not uplift the AdS vacua to dS vacua with positive CC. Thus it remains a challenging task to find phenomenologically acceptable vacua in the type IIA string theory.