Yes, there are other types of particles that can flow or carry various types of fundamental interactions. While electrons are a type of particle that carries electric charge and can participate in electric currents, there are other particles associated with different interactions.
For example, photons are particles that carry the electromagnetic force, and they are responsible for the flow of electromagnetic radiation, including visible light, radio waves, and X-rays. Photons do not have electric charge, but they can interact with charged particles, causing them to move and carry energy.
Regarding the graviton, it is a hypothetical particle that is predicted in the framework of quantum gravity. The graviton is postulated to be the quantum of the gravitational field and is thought to mediate the force of gravity. However, it's important to note that the existence of the graviton has not been confirmed experimentally, and it remains a subject of ongoing research and investigation.
If the graviton exists, it would be the particle associated with the gravitational force, analogous to how photons are associated with the electromagnetic force. However, due to the extreme weakness of the gravitational force compared to other fundamental forces, detecting and studying gravitons is extremely challenging, and experimental evidence for their existence is yet to be found.
In summary, while electrons are well-known for carrying electric charge and participating in electric currents, other particles like photons can carry different types of interactions, and the existence of the graviton, if confirmed, would indicate a particle associated with the gravitational force.