A question has occurred to me that I am unable to answer. Consider a universe without other mater, besides that which is described. In this universe there is one person (you) and a chain (stretched along the x-axis) both accelerating around and aligned on the y-axis one above the other such that you do not view it as moving. The chain should from your point of view not change positions or experience any change what so ever, however I "know" that the chain expands do to inertia, experiences time dilation, and curves space time. All these phenomena are visible signs of movement but if you don't view the chain as moving... syntax error. I have heard, though not read, Mach's point of view that acceleration is relative to all mater in the universe, but I am also aware that point of view is not widely accepted. So I am left with my question of "what is acceleration relative to?".