Scale-separated AdS2 flux vacua from type II
Abstract
Motivated by the question of whether the internal scales of a compactification can be parametrically decoupled from the external curvature scale, and by the possibility of probing such vacua holographically, we construct the first AdS2 flux vacua with parametric scale separation. We compactify type II string theory on a G2 structure orbifold times a circle in the presence of smeared spacetime-filling O1/O5-planes or O4/O8-planes, together with NSNS and RR fluxes. We derive the two-dimensional dilaton-gravity effective theory and exhibit families of vacua in which unbounded F5 and H7 fluxes provide parametric control in type IIB, while unbounded F4, F8, and H7 fluxes provide parametric control in type IIA. For large flux quanta, the string coupling becomes parametrically weak, all internal bulk radii become parametrically large in string units, and the Kaluza--Klein scale separates from the AdS2 curvature scale. We analyze the ten-dimensional Killing-spinor equations and identify parametric branches preserving 𝒩=(1,1) supersymmetry in two dimensions. We explain how our geometrically scale-separated AdS2 vacua are compatible with a recent no-go theorem for scale separation in theories with extended supersymmetry. Finally, we discuss various T-dualities leading to other type IIB and type IIA compactifications on G2 structure spaces times a circle and SU(3) structure spaces times a two-torus.
Related
BibTeX
@misc{tringas2026scaleseparated,
title = {{Scale-separated AdS$_2$ flux vacua from type II}},
author = {George Tringas and Timm Wrase},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.02814},
eprint = {2609.02814},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.02814},
}
RIS
TY - UNPB
TI - Scale-separated AdS_2 flux vacua from type II
AU - George Tringas
AU - Timm Wrase
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.02814
UR - https://arxiv.org/abs/2609.02814
AB - Motivated by the question of whether the internal scales of a compactification can be parametrically decoupled from the external curvature scale, and by the possibility of probing such vacua holographically, we construct the first AdS_2 flux vacua with parametric scale separation. We compactify type II string theory on a G_2 structure orbifold times a circle in the presence of smeared spacetime-filling O1/O5-planes or O4/O8-planes, together with NSNS and RR fluxes. We derive the two-dimensional dilaton-gravity effective theory and exhibit families of vacua in which unbounded F_5 and H_7 fluxes provide parametric control in type IIB, while unbounded F_4, F_8, and H_7 fluxes provide parametric control in type IIA. For large flux quanta, the string coupling becomes parametrically weak, all internal bulk radii become parametrically large in string units, and the Kaluza--Klein scale separates from the AdS_2 curvature scale. We analyze the ten-dimensional Killing-spinor equations and identify parametric branches preserving 𝒩=(1,1) supersymmetry in two dimensions. We explain how our geometrically scale-separated AdS_2 vacua are compatible with a recent no-go theorem for scale separation in theories with extended supersymmetry. Finally, we discuss various T-dualities leading to other type IIB and type IIA compactifications on G_2 structure spaces times a circle and SU(3) structure spaces times a two-torus.
ER -