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arXiv · 2512.10746

A 12d Origin of the Type IIB String Theory: A Review

Chang Cheng
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Abstract

Type IIB string theory possesses a conjectured non-perturbative \SLZ{} S-duality that is not realised geometrically in ten dimensions (10d). We examine the proposal that this duality has a twelve-dimensional (12d) origin. In the axio-dilaton sector the picture is robust: the D7 brane and D(-1) instanton arise as a Kaluza-Klein monopole and pp-wave of 12d gravity reduced on a torus, on which the \SLZ{} acts geometrically as large diffeomorphisms. Beyond this sector it weakens to a covariant repackaging of the 10d theory: the form fields and their dualities admit a 12d-covariant organisation, and the D3-brane worldvolume duality ties to the bulk \SLZ{}, but a full 12d uplift is obstructed. In particular, we identify a U(1)-preserving five-point coupling in the higher-derivative effective action that admits no 12d-covariant form. The 12d picture thus remains an effective organisation of the 10d theory rather than a fundamental spacetime.

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Chang Cheng. 2025-12-11. A 12d Origin of the Type IIB String Theory: A Review. https://arxiv.org/abs/2512.10746

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