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I'm surprised that you resist that much to change your mind about that possibility, but on the other hand, I'm happy you keep feeding me back. I need to take care not to entertain an endless vibration though. :0)
He simply considers that inertial motion produces an outwards force, while it is also possible to consider that it creates a pulling one.
Have you worked out how mass relates to the mass of particles? If it's actually in the light moving between the particles, how does that light know how much mass it should hold for different kinds of particles?
The point I was making is that we don't ordinarily use gradual accelerations in the twins paradox thought experiment because that would complicate the calculations without providing any gain in return. Clearly though, you want to be able to handle gradual accelerations, but the cost of that is that you can't get to relativistic speeds in a reasonable length of time without tearing your objects apart, so you need to compromise. You can accelerate one particle if the acceleration is gentle and then watch the two adjust to share out the acceleration between them, but you should accelerate both equally if you want to get them up to high speed without tearing them apart (from each other).
Groups of fundamental particles are pushed to high relativistic speeds very quickly in accelerators everyday.
The strength of the light exchanged between the particles is equivalent to the loss of mass due to their bonding, so if we accelerate a particle towards another one, the resistance it offers to move with regard to this light is weak. The main part of its resistance comes from its components' one, which exchange a lot stronger light since they are a lot closer and that the frequency of their exchange is a lot higher. This way, the more there are components, the stronger the light between the particles, and the stronger their resistance to accelerate towards the other one when it has not already accelerated.