Do Gravitons Exist?

[Rhondazvous]

The fact is that nobody knows. We know that gravitational waves exist, but there is no real experimental test which could tell us that these waves have quanta the same way electromagnetism has photons. It seems overwhelmingly likely though, for the simple fact that matter causes gravitation, but matter is fundamentally made of particles subject to quantum uncertainty, and it is difficult to imagine how this quantum uncertainty would not get transferred to the gravity. For example, if an electron is in a quantum superposition of being in place A and in place B, what is its gravity? Half here half there? Does the superposition vanish when you measure the gravity? It should! So, in order not to mess up the logic of quantum mechanics, the gravitational force needs to play by the same quantum rules, and that would usually entail the existence gravitons.

"Does the superposition vanish when you measure the gravity?"

I may be going off in the wrong direction. I'm trying to understand this in terms of it not being possible to measure position and velocity at the same time with equal accuracy. But that would require me to make a connection between velocity and gravity. Well, what is gravity if not movement. You're measuring one objects ability to cause other objects to move toward it based on their mass. Correct?

So we are looking for a physical cause for gravitation. Maybe it is too small to see with current technology, or maybe like dark matter it can't be detected. But we know it's there.

I love scientists. Not because you have all the answers, but because of the way you address the questions. There's a lot of credibility there.