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, e.g., 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 the galaxy bispectrum.

Constraints on long-lived, higher-spin particles from the galaxy bispectrum / Moradinezhad Dizgah, A.; Franciolini, G.; Kehagias, A.; Riotto, A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 98:6(2018). [10.1103/PhysRevD.98.063520]

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

Franciolini G.;Riotto A.
2018

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, e.g., 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 the galaxy bispectrum.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1643174
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