The Spectra of Type IIB Flux Compactifications at Large Complex Structure

TL;DR

This paper analytically and numerically studies the spectra of key matrices in type IIB flux compactifications at large complex structure, revealing universal eigenvalue structures and correlations with the superpotential, impacting stability and landscape modeling.

Contribution

It provides the first analytical computation of the spectra of the Hessian and related matrices in this setting, showing universal degeneracies and correlations with the superpotential.

Findings

Spectra exhibit universal highly degenerate eigenvalues independent of flux or geometry.

No tachyons are present in the Hessian spectrum within the studied subspace.

Strong linear correlation between scalar mass scale and superpotential value, especially for g_s<1.

Abstract

We compute the spectra of the Hessian matrix, ${\cal H}$, and the matrix ${\cal M}$ that governs the critical point equation of the low-energy effective supergravity, as a function of the complex structure and axio-dilaton moduli space in type IIB flux compactifications at large complex structure. We find both spectra analytically in an $h^{1,2}_-+3$ real-dimensional subspace of the moduli space, and show that they exhibit a universal structure with highly degenerate eigenvalues, independently of the choice of flux, the details of the compactification geometry, and the number of complex structure moduli. In this subspace, the spectrum of the Hessian matrix contains no tachyons, but there are also no critical points. We show numerically that the spectra of ${\cal H}$ and ${\cal M}$ remain highly peaked over a large fraction of the sampled moduli space of explicit Calabi-Yau compactifications with 2 to 5 complex structure moduli. In these models, the scale of the supersymmetric contribution to the scalar masses is strongly linearly correlated with the value of the superpotential over almost the entire moduli space, with particularly strong correlations arising for $g_s < 1$. We contrast these results with the expectations from the much-used continuous flux approximation, and comment on the applicability of Random Matrix Theory to the statistical modelling of the string theory landscape.