### Abstract

In this paper we study three point functions of the type II superstring involving one graviton and two massive states, focusing in particular on the spin-7/2 fermions at the first mass level. Defining a gravitational quadrupole "h factor," we find that the nonminimal interactions of string states in general are parametrized by h ≠ 1, in contrast with the preferred field theory value of h = 1 (for tree-level unitarity). This difference arises from the fact that consistent gravitational interactions of strings are related to the presence of a complete tower of massive states, not present in the ordinary field theory case.

Original language | English (US) |
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Pages (from-to) | 1-8 |

Number of pages | 8 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 59 |

Issue number | 10 |

State | Published - May 15 1999 |

### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

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## Cite this

Giannakis, I., Liu, J. T., & Porrati, M. (1999). Massive higher spin states in string theory and gravitational quadrupoles.

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,*59*(10), 1-8.