Abstract
We study the vacua of 4d heterotic toroidal orbifolds using effective theories consisting of an overall Kähler modulus, the dilaton, and non-perturbative corrections to both the superpotential and Kähler potential that respect modular invariance. We prove three de Sitter no-go theorems for several classes of vacua and thereby substantiate and extend previous conjectures. Additionally, we provide evidence that extrema of the scalar potential can occur inside the PSL(2, ℤ) fundamental domain of the Kähler modulus, in contradiction of a separate conjecture. We also illustrate a loophole in the no-go theorems and determine criteria that allow for metastable de Sitter vacua. Finally, we identify inherently stringy non-perturbative effects in the dilaton sector that could exploit this loophole and potentially realize de Sitter vacua.
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Leedom, J.M., Righi, N. & Westphal, A. Heterotic de Sitter beyond modular symmetry. J. High Energ. Phys. 2023, 209 (2023). https://doi.org/10.1007/JHEP02(2023)209
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DOI: https://doi.org/10.1007/JHEP02(2023)209