# A Note on the dS Swampland Conjecture, Non-BPS branes and K-theory

## TL;DR

This paper discusses how the de Sitter swampland conjecture constrains string theory vacua, specifically linking it to K-theory charge cancellation in fluxed Type IIA orientifold models with non-BPS branes.

## Contribution

It highlights a potential falsification of the dS swampland conjecture if certain classical fluxed Type IIA vacua with non-BPS D7-branes exist, connecting it to K-theory charge cancellation.

## Key findings

- The dS swampland conjecture implies K-theory charge cancellation.
- Classical fluxed Type IIA vacua with non-BPS D7-branes could challenge the conjecture.
- The existence of such vacua would falsify the conjecture.

## Abstract

We point out that the de Sitter swampland conjecture would be falsified if classical fluxed Type IIA orientifold vacua with a single non-BPS D7-brane were indeed part of the string theory landscape. In other words, the dS swampland conjecture implies the cancellation of K-theory charges on a compact space.