TY - JOUR

T1 - A note on string excitations and the Higuchi bound

AU - Lüst, Dieter

AU - Palti, Eran

N1 - Funding Information:
We like to thank Gia Dvali, Marvin Lübben and Timo Weigand for valuable discussions. We are particularly grateful to Cumrun Vafa for initial collaboration and for useful discussions. The work of D.L. is supported by the Origins Excellence Cluster .
Publisher Copyright:
© 2019 The Author(s)

PY - 2019/12/10

Y1 - 2019/12/10

N2 - 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 Ms 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 Ms>HMp.

AB - 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 Ms 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 Ms>HMp.

UR - http://www.scopus.com/inward/record.url?scp=85074400712&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2019.135067

DO - 10.1016/j.physletb.2019.135067

M3 - Article

AN - SCOPUS:85074400712

VL - 799

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

M1 - 135067

ER -