I'm a chemist not a physicist, so I have a loose relationship with its laws. I read that light (specifically a photon) doesn't have mass, gravity doesn't act on a photon to alter its trajectory. Instead a mass-laden object (planet/blackhole, which inherently produce a gravitational field) acts on the 'fabric of spacetime,' producing relative curvature to the otherwise linear path that a photon would travel along.
So then why is it not logical to conclude that a photon consumes a certain volume or cross sectional area - if a photon has no volume (or area x time-[c]) why would the curvature of the 'fabric of spacetime' affect the photons path?
In relation I wonder - is there a limit to the intensity or # photons per unit area; I'm specifically thinking about concentrated solar energy, is there an upper limit, does Planck have a role here? Maybe a better way to ask this is - can multiple photons continue to combine into one with higher and higher frequency, I suppose up to the frequency length of a Planck-length (material logistics aside)?
On brief research on high-est frequency I was led to the Casimir effect, Alcubierre, and "zero point energy" said to possibly have indirect relation back to gravity - so I know I'm over my head here...your ideas/thoughts/help is appreciated.