Constraints on long-lived, higher-spin particles from galaxy bispectrum
Abstract
The presence of massive particles with spin during inflation induces distinct signatures on correlation functions of primordial curvature fluctuations. In particular, the bispectrum of primordial perturbations obtains an angular dependence determined by the spin of the particle, which can be used to set constraints on the presence of such particles. If these particles are long-lived on super-Hubble scales, as is the case for example for partially massless particles, their imprint on correlation functions of curvature perturbations would be unsuppressed. In this paper, we make a forecast for how well such angular dependence can be constrained by the upcoming EUCLID spectroscopic survey via the measurement of galaxy bispectrum.
Cite
@article{arxiv.1805.10247,
title = {Constraints on long-lived, higher-spin particles from galaxy bispectrum},
author = {Azadeh Moradinezhad Dizgah and Gabriele Franciolini and Alex Kehagias and Antonio Riotto},
journal= {arXiv preprint arXiv:1805.10247},
year = {2018}
}
Comments
v2 is equivalent to the version accepted by the Phys.Rev. D. A new plot and some additional discussions added