TIME AS A MEASURE (TIMEFUN)

TIME AS A MEASURE OF CHANGE PAST = FUTURE

The idea of time as a measure of change, moving from point A to B, is a common-sense intuition, but Einstein's theories introduce a more complex reality where time is relative, not absolute.

Relativity of time: Einstein's special relativity established that measurements of time are not universal but depend on the observer's relative motion. A clock moving at high speed relative to a stationary observer will tick slower (time dilation).

Block Universe: This suggests a "block universe" view where past, present, and future all exist equally in a four-dimensional spacetime continuum, and our perception of time "flowing" might be an illusion. Time is more like a dimension of this continuum, where "location" in time is relative to the observer's motion and position in space

The idea of a "mirror world" where time runs backward is a fascinating concept found in some theoretical physics models, but it's important to note this remains highly speculative theory, not an established fact or something directly observed by experiments at facilities like the CERN collider.

Time as a Measure of Change

You are correct that time is intrinsically linked to change. In physics, the direction of time, often called the "arrow of time," is generally explained by entropy (the second law of thermodynamics), which states that the disorder in the universe tends to increase over time. Natural processes run from order to disorder, which defines our forward perception of time.

The Mirror World Theory

Some theoretical physicists have proposed a "mirror" or "anti-universe" theory to explain certain cosmic mysteries, such as the excess of matter over antimatter and the nature of dark matter. This idea is rooted in a concept called CPT symmetry (Charge, Parity, and Time), a fundamental principle that states the laws of physics should remain the same if you:

Flip the electric charge (Charge, C).
Mirror the spatial configuration (Parity, P).
Reverse the direction of time (Time, T).

The theory suggests that at the Big Bang, two universes might have been created simultaneously:

Our universe, where time moves forward (from our perspective).

An "anti-universe" where charge, parity, and time are all reversed, meaning time would flow backward relative to our own.