Laplacians in Various Dimensions and the Swampland
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| Format: | Preprint |
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2025
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| author | Aoufia, Christian Castellano, Alberto Ibáñez, Luis |
| author_facet | Aoufia, Christian Castellano, Alberto Ibáñez, Luis |
| contents | The species cutoff is a moduli-dependent quantity signaling the onset of quantum gravitational phenomena, whose form can be oftentimes determined from higher-derivative and higher-curvature corrections within low-energy gravitational EFTs. In this work, we point out that these Wilson coefficients are eigenfunctions of an appropriate second-order elliptic operator defined over moduli space in theories with more than four supercharges. This was already known to be the case for the leading $\mathcal{R}^4$-correction to the two-derivative (bosonic) action of maximal supergravity in $d\leq 10$. Here, we reconsider this fact from the Swampland point of view and show how, in $d=10,9,8$, solving a Laplace equation imposes non-trivial restrictions on the species hull vectors. We further argue that this property is also satisfied in settings with less supersymmetry. In particular, we focus on the $\mathcal{R}^4$-operator in minimal supergravity theories in $d=10,9$, and on the leading $\mathcal{R}^2$-term in setups with 8 supercharges in $d=6,5,4$. Finally, we provide a symmetry-based criterion for determining when the relevant elliptic operator should be the Laplacian. A bottom-up rationale for this constraint remains to be fully understood, and we conclude by outlining some compelling possibilities. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_03253 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Laplacians in Various Dimensions and the Swampland Aoufia, Christian Castellano, Alberto Ibáñez, Luis High Energy Physics - Theory The species cutoff is a moduli-dependent quantity signaling the onset of quantum gravitational phenomena, whose form can be oftentimes determined from higher-derivative and higher-curvature corrections within low-energy gravitational EFTs. In this work, we point out that these Wilson coefficients are eigenfunctions of an appropriate second-order elliptic operator defined over moduli space in theories with more than four supercharges. This was already known to be the case for the leading $\mathcal{R}^4$-correction to the two-derivative (bosonic) action of maximal supergravity in $d\leq 10$. Here, we reconsider this fact from the Swampland point of view and show how, in $d=10,9,8$, solving a Laplace equation imposes non-trivial restrictions on the species hull vectors. We further argue that this property is also satisfied in settings with less supersymmetry. In particular, we focus on the $\mathcal{R}^4$-operator in minimal supergravity theories in $d=10,9$, and on the leading $\mathcal{R}^2$-term in setups with 8 supercharges in $d=6,5,4$. Finally, we provide a symmetry-based criterion for determining when the relevant elliptic operator should be the Laplacian. A bottom-up rationale for this constraint remains to be fully understood, and we conclude by outlining some compelling possibilities. |
| title | Laplacians in Various Dimensions and the Swampland |
| topic | High Energy Physics - Theory |
| url | https://arxiv.org/abs/2506.03253 |