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A photons path is bent by bent space so certainly there must be a force on the photon? (change of momentum occurs).
Quote from: talanum1 on 15/10/2021 17:58:01A photons path is bent by bent space so certainly there must be a force on the photon? (change of momentum occurs).A photons path is not ''bent'' by ''bent'' space ! Firstly the word we use is curvature , not ''bent'' . A photon travels in general a straight path unless it is deflected or reflected etc . Additionally photons tend to travel where ever the energy is required but this is also what we call linear vectors . A single photon has a very limited force because of the formula E=mc^2 but a ''packet'' of photons can exert more force as observed in the photon electrical effect . When considering the mass and force involved in photons it is better to consider them in a XY format rather than a singular photon ! Visual matter can absorb a single photon potential energy no bother but when bombarding with lots of photons , Newtons third law applies and the visual matter ''pushes back'' in the form of photon electrical effect .
Quote from: talanum1 on 15/10/2021 17:58:01A photons path is bent by bent space so certainly there must be a force on the photon? (change of momentum occurs).Yes, in that case, gravity does indeed exert a force on the photon in question.
Not quite. A real field that exerts a force requires a mediator. Gravity is manifestly a pseudo force.
Quote from: BilboGrabbins on 15/10/2021 22:42:05Not quite. A real field that exerts a force requires a mediator. Gravity is manifestly a pseudo force.If you don't think gravity exerts a force, then I'm guessing you've never used a bathroom scale before.
What you experience is space pushing down on you.
Quote from: BilboGrabbins on 15/10/2021 23:30:37What you experience is space pushing down on you.And that push is a force.
It's not a force.
Quote from: BilboGrabbins on 16/10/2021 00:08:16It's not a force.Then my bathroom scale wouldn't measure anything.
F = mg is completely redescribed by curvature in GR. Not force.
Quote from: BilboGrabbins on 16/10/2021 00:34:49F = mg is completely redescribed by curvature in GR. Not force.You know that that "F" in that equation is force, right?
You're failing, intentionally, to listening to what I am saying.
Quote from: BilboGrabbins on 16/10/2021 01:55:15You're failing, intentionally, to listening to what I am saying.I know what you're saying, but that doesn't mean that gravity doesn't produce a force.
No because general relativity is from first principles, a classical pseudo force. What do we mean by this?It's equivelent to saying gravity is a "false" force.
Quote from: BilboGrabbins on 16/10/2021 02:01:56No because general relativity is from first principles, a classical pseudo force. What do we mean by this?It's equivelent to saying gravity is a "false" force.Centrifugal force is a "false" force too, but it's still a force nonetheless. Otherwise, you couldn't measure it in newtons.