> quantum theory tells us that gravity arises from the exchange of particles No, it doesn't. That statement is wrong on two levels: 1) We don't have a confir

> quantum theory tells us that gravity arises from the exchange of particles No, it doesn't. That statement is wrong on two levels: 1) We don't have a confirmed quantum theory of gravity 2) In quantum field theories in general it's not really accurate to say that "[forces] arise from the exchange of particles". In some QFTs, in some situations, you can perform a perturbative expansion which maps onto the Feynman diagram view of particle exchange, but that's not universally possible. They really are quantum _field_ theories, not quantum particle theories.