How Cn Gravity Affect Light When Light Has No Mass?

[Rhondazvous]

Is it possible there is no gravitational field?

No, even within the context of your proposal you're simply wondering whether or not some other x might effect that grav field...there's a grav field in that proposition all the same.   Regardless of what gravity is a property of, gravity, then, would exist as a property of that x.

To demonstrate this in another context.  We don't know whether or not there are gravitons, a hypothetical fundamental particle in qft that mediates the force of gravitation.  We've never identified one.  Suppose there aren't.  There's still gravity, there are still grav fields.

If there’s a gravity field, there has to be a fundamental particle that mediates that field. Just like it to decades to find the mediator of the higgs field

However, we’re not understanding each other about the difference between a field and a property. I’m thinking of gravity as a property, not field. Just like there’s no heat field. No fundamental property that mediates heat. It’s just a property of matter to get hot when it’s energy increases. Maybe, it’s a property of massive bodies and energetic particles like light to gravitate toward other such bodies. Or maybe it’s a property of time space to warp in the vicinity of such. Then no fundamental particle is needed.