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The presence of massive particles with spin during inflation induces distinctsignatures on correlation functions of primordial curvature fluctuations. Inparticular, the bispectrum of primordial perturbations obtains an angulardependence determined by the spin of the particle, which can be used to setconstraints on the presence of such particles. If these particles arelong-lived on super-Hubble scales, as is the case for example for partiallymassless particles, their imprint on correlation functions of curvatureperturbations would be unsuppressed. In this paper, we make a forecast for howwell such angular dependence can be constrained by the upcoming EUCLIDspectroscopic survey via the measurement of galaxy bispectrum.

Constraints on long-lived, higher-spin particles from galaxy bispectrum