On the spin of gravitational bosons

TL;DR

This paper explores the quantum structure and spacetime properties of massive vector bosons, gravitinos, and gravitons, revealing their complex spin behavior and implications for gravitational theories.

Contribution

It uncovers the spacetime structure of these particles and predicts probabilistic spin measurements, offering new insights into their quantum and classical interactions.

Findings

Spin measurement of a massive gravitino yields 3/2 or 1/2 with equal probability.

The classical Riemannian curvature remains unchanged, preserving general relativity tests.

Quantum contributions modify propagators and introduce additional phases.

Abstract

We unearth spacetime structure of massive vector bosons, gravitinos, and gravitons. While the curvatures associated with these particles carry a definite spin, the underlying potentials cannot be, and should not be, interpreted as single spin objects. For instance, we predict that a spin measurement in the rest frame of a massive gravitino will yield the result 3/2 with probability one half, and 1/2 with probability one half. The simplest scenario leaves the Riemannian curvature unaltered; thus avoiding conflicts with classical tests of the theory of general relativity. However, the quantum structure acquires additional contributions to the propagators, and it gives rise to additional phases.