gravitino

The gravitino is a hypothetical particle in physics, specifically a fermion associated with the graviton in theories of supergravity. Supersymmetry, a complex mathematical framework in particle physics, proposes a symmetry between fermions and bosons. This theory suggests that for every known particle, there exists a supersymmetric partner with the opposite spin type. For instance, if a fermion like an electron has a partner, it would be a boson called a selectron.12

The graviton is the hypothetical quantum particle that carries the gravitational field, similar to how the photon carries the electromagnetic field. Gravitons are predicted to be massless and travel at the speed of light. While supersymmetry naturally includes the graviton, and theories of supergravity incorporate gravity along with other fundamental forces, there is currently no experimental evidence for these "superparticles," including the gravitino.324