Do Photons Have a Gravitational Effect?

[Great Richard]

No,

All I meant was that if photons gravitate, then they produce gravitation. The cosmos has some net collective gravitational field. Given photons are everywhere, I was just wondering what percentage of the cosmic gravitational field would owe to EM?

GrayGhost

Does a photon displace?
Does a photon have mass?
Can you create mass from a photon?
Observation shows us the sorce point of a photon. The relative position of objects in the universe change after the photon is originated. If photons gravitated we would see a blur in the universe.

 

[Dale]

Hi Great Richard, welcome to PF!

Please read through the above discussion and ask if you have questions. Light does gravitate, and mass can be created from a pair of photons.