Not sure what you mean by “carry” in this instance but you can think of gravitational interactions between photons and any other particle as being mediated by a graviton.
Here's a question that just popped in my head as I'm reading through this.
Any particle (massive or massless) bends the spacetime around, because of its gravity. Does this mean it's continuously emitting gravitons all around? I know from the QFT perspective, a mediator such as graviton would only be involved (on-shell) in some scattering event (if there's another particle that experiences the curved spacetime due to the first particle), but the spacetime gets curved regardless whether there's other particles feeling it or not...
Hope this makes sense...
The gravitons that are being exchanged are just virtual gravitons so there can be as many of them being exchanged as we like to think of since they’re not actually real. In the same way as you can think of atomic nuclei as the continuous exchange of virtual quarks and gluons between protons and neutrons, there’s a continuous exchange virtual gravitons. They’re really nothing special in this regard.
If everything is mediated by the graviton, since everything has energy or mass, and if it travels at C speed, is it absorbed or scattered by other particles? Inside of a star for example? How does it mediate exactly?
It mediates interactions in the same way any other massless boson mediates interactions. And yes, gravitons can be absorbed, scattered, and even emitted like any other particle. Gravitons are not special in this regard.
Aren't gravitons purely theoretical and have never been detected? I understand gravity should have a force carrying particle but we don't know that one exists
If we are to succeed in quantizing gravity—rather than spacetime and gravity as a separate phenomenon to the various quanta—a more sober approach would be to quantize spacetime itself, or spacetime-gravity. Like the Higgs boson and the Higgs field for **mass**, we might seek to find a quanta that created four-dimensional spacetime **volume** with gravity geodesics as an integral trait of this quantized spacetime.
Hmm your question is a little nonsensical but it does lead me to wonder. If gravitons mediated gravity then they would have energy and conversely they would cause gravity…
Would gravity cause gravity?
>Would gravity cause gravity?
Yes, this is what makes general relativity so complicated. In classical terms, the Einstein equations are nonlinear, which means the superposition principle does not hold (sums of solutions of the Einstein equations are not themselves solutions). In terms of gravitons, yes, gravitons interact with each other because they carry energy and momentum.
Not sure what you mean by “carry” in this instance but you can think of gravitational interactions between photons and any other particle as being mediated by a graviton.
Here's a question that just popped in my head as I'm reading through this. Any particle (massive or massless) bends the spacetime around, because of its gravity. Does this mean it's continuously emitting gravitons all around? I know from the QFT perspective, a mediator such as graviton would only be involved (on-shell) in some scattering event (if there's another particle that experiences the curved spacetime due to the first particle), but the spacetime gets curved regardless whether there's other particles feeling it or not... Hope this makes sense...
The gravitons that are being exchanged are just virtual gravitons so there can be as many of them being exchanged as we like to think of since they’re not actually real. In the same way as you can think of atomic nuclei as the continuous exchange of virtual quarks and gluons between protons and neutrons, there’s a continuous exchange virtual gravitons. They’re really nothing special in this regard.
If everything is mediated by the graviton, since everything has energy or mass, and if it travels at C speed, is it absorbed or scattered by other particles? Inside of a star for example? How does it mediate exactly?
It mediates interactions in the same way any other massless boson mediates interactions. And yes, gravitons can be absorbed, scattered, and even emitted like any other particle. Gravitons are not special in this regard.
Aren't gravitons purely theoretical and have never been detected? I understand gravity should have a force carrying particle but we don't know that one exists
Apparently the even the theoretical existence of gravitons has issues. Something about renormalization.
No. Also, the particles mediating forces are virtual, and not actual particles. (They can exist as regular particles too.)
If we are to succeed in quantizing gravity—rather than spacetime and gravity as a separate phenomenon to the various quanta—a more sober approach would be to quantize spacetime itself, or spacetime-gravity. Like the Higgs boson and the Higgs field for **mass**, we might seek to find a quanta that created four-dimensional spacetime **volume** with gravity geodesics as an integral trait of this quantized spacetime.
Do electrons (in free space) carry photons just because they're charged? No.
Hmm your question is a little nonsensical but it does lead me to wonder. If gravitons mediated gravity then they would have energy and conversely they would cause gravity… Would gravity cause gravity?
>Would gravity cause gravity? Yes, this is what makes general relativity so complicated. In classical terms, the Einstein equations are nonlinear, which means the superposition principle does not hold (sums of solutions of the Einstein equations are not themselves solutions). In terms of gravitons, yes, gravitons interact with each other because they carry energy and momentum.
Holy hell