If I drill a hole through the center of a motionless asteroid, and drop a charged object down it, If the hole goes all the way through, the particle will oscillate, speeding up as it moves towards the center, and slowing down as it moves away. If radiating, we'd expect the oscillations to dampen as some gravitational potential energy gets irreversibly converted. But according to "equivalence principle", the charged object is in free-fall and should not feel any gravity, then it should not radiate. If not radiating, oscillations wouldn't dampen. So which one is true, dampen or not dampen ??