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String Theory and non-Riemannian Geometry

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arxiv 2008.03084 v2 pith:IVXOL3IM submitted 2020-08-07 hep-th

String Theory and non-Riemannian Geometry

classification hep-th
keywords stringnon-riemannianclosedmetricnoveltheoryvacuaalternative
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The $\mathbf{O}(D,D)$ covariant generalized metric, postulated as a truly fundamental variable, can describe novel geometries where the notion of Riemannian metric ceases to exist. Here we quantize a closed string upon such backgrounds and identify flat, anomaly-free, non-Riemannian string vacua in the familiar critical dimension, $D{=26}$ (or $D{=10}$). Remarkably, the whole BRST closed string spectrum is restricted to just one level with no tachyon, and matches the linearized equations of motion of Double Field Theory. Taken as an internal space, our non-Riemannian vacua may open up novel avenues alternative to traditional string compactification.

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