Ha. I guess good themes for PHd dissertations are getting rare.

Massless particles must always move at the speed of light unless it passes through mass. Mass can never go as fast as light.
One of the tricks to slowing light to a halt is creating a cloud of nearly motionless atoms at near absolute zero (-460 degrees Fahrenheit). This is called a Bose-Einstein condensate.
But everything wants to move. Existence is moot and just an aspect of language.

CAN gravitons which move at the speed of light be slowed down or stopped at absolute zero? If so, anti gravity could be manipulated.
I want an anti gravity car.