A Momentum calculation of a rotating rod

[liuxinhua]

If a proton is considered a particle, its rest mass will not change.

When a proton is considered to be a rigid body with a volume, and at acceleration, the velocities of each component is different, measured in an inertial reference frame. Its invariant mass will change.
But the distance between the components will remain unchanged.

 

[vanhees71]

A proton is a complicated bound state of quarks and gluons and as such can be excited, and these excited states manifest themselves as many baryon resonances.

 

[PeterDonis]

When a proton is considered to be a rigid body with a volume, and at acceleration, the velocities of each component is different, measured in an inertial reference frame. Its invariant mass will change.
But the distance between the components will remain unchanged.

A proton is not composed of a fixed number of components at rest relative to each other. You need to stick to classical objects.

 

[liuxinhua]

A proton is not composed of a fixed number of components at rest relative to each other. You need to stick to classical objects.

I just want to say that proton is not a particle. It is made up of smaller components. Of course, this composition can not be described by classical physics.

 

[PeterDonis]

I just want to say that proton is not a particle. It is made up of smaller components. Of course, this composition can not be described by classical physics.

You're just repeating what I've already said. But you failed to notice the key additional thing I said: a proton is not made up of a fixed number of smaller components. So the "distance between components" for a proton is not even well-defined.

 

[PeterDonis]

At this point everything that could be said relevant to the thread topic has been said. Thread closed.

 

[PeterDonis]

@PAllen has provided a good reference that is relevant to this thread topic:

https://arxiv.org/abs/gr-qc/0411145