| Summary: | Abstract We analyse type IIA Calabi-Yau orientifolds with background fluxes and D6- branes. Rewriting the F-term scalar potential as a bilinear in flux-axion polynomials yields a more efficient description of the Landscape of flux vacua, as they are invariant under the discrete shift symmetries of the 4d effective theory. In particular, expressing the extremisa tion conditions of the scalar potential in terms of such polynomials allows for a systematic search of vacua. We classify families of = 0 Minkowski, N $$ \mathcal{N} $$ = 1 AdS and N $$ \mathcal{N} $$ = 0 AdS flux vacua, extending previous N $$ \mathcal{N} $$ findings in the literature to the Calabi-Yau context. We compute the spectrum of flux-induced masses for some of them and show that they are perturbatively stable, and in particular find a branch of N $$ \mathcal{N} $$ = 0 AdS vacua where tachyons are absent. Finally, we extend this Landscape to the open string sector by including mobile D6-branes and their fluxes.
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