Space-time, Perception of Time
Daily Exerpt from "Integrated Theory of Intelligence"
Space-time curvature is effected when a body moves, or a force acts upon it and in turn the structure of space-time affects the way that bodies move and forces act. Because of the interrelationship of all events, space and time not only affect but are also effected by everything that happens within the universe.
The concept of "imaginary" time has also been introduced as a necessary function in an attempt to unify gravity with quantum mechanics. It is indistinguishable from directions in space and there is no significant difference between the forward and backward directions of imaginary time. This differs from the concept of "real" time, which always moves forward toward the future. The second law of thermodynamics requires forward movement only, leading to the concept of "arrow of time".
There are actually at least three arrows of time that compel its forward motion. In addition to the thermodynamic arrow, which is based upon a state of continued heat entropy with a propensity for increasing disorder, there is the psychological arrow, which is based upon our ability to remember past events but not the future, and the cosmological arrow which forces time forward because the universe is in a state of expansion not contraction.
Inside an isolated system the perception of time can also vary within anyone individual. A person who has been administered a mind altering drug may experience time at a different rate than during an ordinary consciousness state. It very much is a mental construct requiring a state of awareness. This would indicate the conscious perception of time can be very much different than the actual constant progression of time as it relates to purely physical events. There are two types of time which flow in a forward direction. Physical or proper time is involved in all physical event processes as relates to all matter-energy transactions and is what the physicist works with. Subjective time requires the presence of consciousness and can be perceived very much differently than actual physical time depending upon the consciousness state.