Abstract
In this work, we investigate the existence of string theory solutions with a d-dimensional (quasi-) de Sitter spacetime, for 3 ≤ d ≤ 10. Considering classical compactifications, we derive no-go theorems valid for general d. We use them to exclude (quasi-) de Sitter solutions for d ≥ 7. In addition, such solutions are found unlikely to exist in d = 6, 5. For each no-go theorem, we further compute the d-dependent parameter c of the swampland de Sitter conjecture, \( {M}_p\frac{\mid \nabla V\mid }{V}\ge c \). Remarkably, the TCC bound \( c\ge \frac{2}{\sqrt{\left(d-1\right)\left(d-2\right)}} \) is then perfectly satisfied for d ≥ 4, with several saturation cases. However, we observe a violation of this bound in d = 3. We finally comment on related proposals in the literature, on the swampland distance conjecture and its decay rate, and on the so-called accelerated expansion bound.
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Andriot, D., Horer, L. (Quasi-) de Sitter solutions across dimensions and the TCC bound. J. High Energ. Phys. 2023, 20 (2023). https://doi.org/10.1007/JHEP01(2023)020
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DOI: https://doi.org/10.1007/JHEP01(2023)020