[This is an extension of this Worldbuilding.SE question.]
So, general relativity states that: For example, objects in a gravity-less environment, but in a container accelerating at 9.8m/s^2 (such as a space vessel), would behave like the same objects in an otherwise similar environment on Earth (with a gravitational constant acceleration of 9.8m/s^2).
Another point is the thought experiment of "What would happen if you had a hole that went through the entire earth, then jumped down it?" It's usually answered as "You (or whatever's left of your corpse) would slingshot close to the other end of the tunnel, before falling back to a bit further away from the one you jumped down, then repeat this until you're idly floating at the very center."
Also, theoretical physics describes gravity as being caused by the properties of fundamental particles called "gravitons".
So, with all these in mind, if you had a large group (or lack thereof) of gravitons, could they be used as a deceleration cushion, possibly creating a weightless environment that behaves as if it is filled with a highly viscous fluid?
(And, yes, I've read this question - I'm asking about a full-stop, while gravitational slingshots would pull objects back towards the center of the field given enough time and not enough speed in the right direction. Don't bother asking.)