How do gravitons and photons interact? First of all, I am a noob in physics (I‘m a computer scientist) and started reading Hawking‘s „A brief history of time“. In Chapter 6 he says that “electromagnetic force [...] interacts with electrically charged particles like electrons and quarks, but not with uncharged particles such as gravitons.”
My question now: how come that extremely massiv object are able to bend light (e.g. we are able to see distant stars that are behind the sun)? I mean, how can gravitation (actually gravitons) affect photons if gravitons are not charged?
I know that there are some questions here that go in the same direction but as I‘m a noob in physics, I don‘t quite get the answers.
I‘d appreciate if someone had a laymen‘s explanation for this that not necessarily covers all different aspects (I might pose some follow-up questions) but explains the essence.
Thanks to y‘all!
 A: Gravity couples to energy, not just mass as in Newtonian theory (really it couples to energy density, momentum, and stress). Since photons have energy, they feel gravity.
As a classical phenomenon, lensing is generally thought about as light interacting with the curvature of space rather than gravitons. A physical process involving the interaction of gravitons with photons would be the electromagnetic scattering of gravitational waves, as hypothetically happened in the early universe when primordial gravitational waves scattered off the cosmic microwave background. 
A: Gravitational lensing (light being "bent" by stars for instance) relates to general relativity, the graviton is a theorised particle in quantum field theory. There is currently no complete and accepted theory of quantum gravity which connects the two.
In general relativity the curvature of spacetime alters the path of particles and causes what we call gravity. This means even massless particles like photons have their paths changed since they still travel through spacetime.
A: Gravitons should couple to almost every particle. It is just a matter of how much it couples with the particle. However in the particle world gravitons are pretty weak compared to the other forces. However on the largest of scales gravitons and gravity wins over. To answer the question gravitons do couple to photons.
