Spin-3/2 and spin-2 charged massive states in a constant electromagnetic background

Abstract

We develop in components the superspace action obtained in [1] describing the first massive level of the open charged superstring in a flat four-dimensional spacetime. In the absence of an electromagnetic background, we show how the Rarita-Schwinger and Fierz-Pauli Lagrangians are retrieved for spin-3/2 and 2, respectively. We then write different forms of the action in the presence of the electromagnetic background. The resulting equations of motion describe the propagation of fields of charged spin-3/2 and spin-1/2 on the one hand, and spin-2, 1 and 0 on the other.

Learning from superstring massive states

“…Despite these developments, the problem of high spin particles remains unsolved to this day, when it comes to finding a Lagrangian with only the fields of higher spins. Here, we shall report on a substantial progress: a solution the original problem of finding the equations of motion [1][2][3][4].…”

“…We briefly comment on use of amplitude computation to investigate different forms of the Weak Gravity Conjectures. This talk is based on [1][2][3][4][5]…”