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arxiv 2010.05936 v2 pith:GI4OED3G submitted 2020-10-12 hep-th

Iosif Bena , G. Bruno De Luca , Mariana Graña , Gabriele Lo Monaco This is my paper · ORCID
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abstract

We analyze the stability of four-dimensional de Sitter vacua constructed by compactifying massive Type IIA supergravity in the presence of two O8 sources [1]. When embedded in String Theory the first source has a clear interpretation as an O8$_-$ plane, but the second one could correspond to either an O8$_+$ plane or to an O8$_-$ plane with 16 D8-branes on top. We find that this latter solution has a tachyonic instability, corresponding to the D8-branes moving away from the O8$_-$ plane. We comment on the possible ways of distinguishing between these sources.

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  1. Anomalies and D-branes in the Dabholkar-Park background

    hep-th 2024-12 conditional novelty 6.0 of 10

    Stable D-branes in the Dabholkar-Park background are derived from world-sheet anomalies with boundary Majorana fermions, matching the known relative KR-theory classification and explaining its 4-fold periodicity.

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