hypothetical particle
quantum particle hypothesized or theorized or part of a posited model or explanation
graviton
hypothetical elementary particle that mediates gravitation
sterile neutrino
hypothetical antiparticle of neutrino
tachyon
hypothetical particle with imaginary mass which is hypothesized to always travel faster-than-light
mirror matter
hypothetical counterpart to ordinary matter
Magnetic photon
ia hypothetical particle
dark photon
theoretical elementary particle
W' and Z' bosons
hypothetical gauge bosons that arise from extensions of the electroweak symmetry of the Standard Model
magnetic monopole
hypothetical particle with one magnetic pole
Geon
nonsingular electromagnetic or gravitational wave held together in a confined region by the gravitational attraction of its own field energy
Planck particle
hypothetical particle
X and Y bosons
charged massive gauge bosons in the SU(5) Georgi–Glashow grand unified model mediating proton decay, filling out the adjoint representation of SU(5) together with the gluon, the photon and the W and Z bosons
Y boson
charged massive gauge boson of charge ±⅓𝑒 in grand unified theories mediating proton decay
zino
superpartner of the Z boson
weakly interacting massive particle
dark matter candidate