Abstract
In this article we show that finite perturbative corrections in non-supersymmetric strings can be understood via an interplay between modular invariance and misaligned supersymmetry. While modular invariance is known to be crucial in closed-string models, its presence and role for open strings is more subtle. Nevertheless, we argue that it leads to cancellations in physical quantities such as the one-loop cosmological constant and prevents them from diverging. In particular, we show that if the sector-averaged number of states does not grow exponentially, as predicted by misaligned supersymmetry, all exponential divergences in the one-loop cosmological constant cancel out as well. To account for the absence of power-law divergences, instead, we need to resort to the modular structure of the partition function. We finally comment on the presence of misaligned supersymmetry in the known 10-dimensional tachyon-free non-supersymmetric string theories.
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Cribiori, N., Parameswaran, S., Tonioni, F. et al. Modular invariance, misalignment and finiteness in non-supersymmetric strings. J. High Energ. Phys. 2022, 127 (2022). https://doi.org/10.1007/JHEP01(2022)127
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DOI: https://doi.org/10.1007/JHEP01(2022)127