Does the chair's force create spacetime curvature in the train paradox?

[ZealScience]

I am thinking about train paradox here. The only difference between the passenger and the person waiting at the station is that the passenger is experiencing a force. They have exactly the same relative velocity and relative acceleration. The difference of this paradox from twin paradox is that there is no change in gravitational field here. So I assume that the force exerted by the chair also create a curvature that makes the RF of the passenger different from RF of the station. So what is the physics behind?

 

[pervect]

The passenger on the train isn't experiencing any force if the train is in uniform motion. The resolution isn't any form of force or curvature, it's the relativity of simultaneity.

 

[Matterwave]

What train paradox are we talking about here? Can you give some background to your problem?

 

[ZealScience]

Sorry, for the ambiguity.

I mean where the passenger travels and returns to the station and found out that his age difference from the person waiting on the platform for the whole journey has changed.

So if he returns there would be an acceleration and force acting on it by the seat.