A Note on String Excitations and the Higuchi Bound

Lust, Dieter; Palti, Eran

doi:10.1016/j.physletb.2019.135067

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A Note on String Excitations and the Higuchi Bound

MPS-Authors

Lust, Dieter
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Palti, Eran
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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引用

Lust, D., & Palti, E. (2019). A Note on String Excitations and the Higuchi Bound. Physics Letters B, 799, 135067. doi:10.1016/j.physletb.2019.135067.

引用: https://hdl.handle.net/21.11116/0000-0005-D79F-6

要旨

In this brief note we consider the interaction between high spin excitations in string theory along the Regge trajectory and the Higuchi bound in de Sitter space. There is always a point along the Regge trajectory where the Higuchi bound is violated. However, this point precisely coincides with a string whose length is of order the de Sitter Hubble scale. String theory therefore manifests no immediate inconsistency as long as the string scale $M_s$ is above the Hubble scale $H$. However, an implication is that the Regge trajectory must be significantly modified at some ultraviolet scale. Insisting that this modification should occur no earlier than the Planck scale would lead to a bound on the string scale of $M_s > \sqrt{H M_p}$.