Abstract
It is accepted that the speed of light is the fundamental constant C in free space. Free space is assumed to refer to the almost stable conditions that exist away from matter. The effects of matter permeate all of space, but, at sufficiently large distances away from aggregates of matter, those effects can be minimal and quite nearly stable. This paper puts forward the postulate that the presence of matter causes light to slow as it approaches the matter. This change in the speed of light is proposed to be equal but opposite to changes in the speed of freely falling objects due to gravity. What light gives up matter gains, and, vice versa. Equations are derived that demonstrate the positive consequences of a variable speed of light.
James A Putnam