The Arrow of Time Can We Reverse the Time?

If we could reverse the time, would it look like a movie going backwards?

The laws of nature, except the second law of thermodynamics, are symmetric in time. Reversing the time in the dynamical equations of motion simply describes everything going backwards. The second law is different. Entropy must never decrease in time, except statistically and briefly.

Many natural processes are apparently irreversible. Irreversibility is intimately connected to the direction of time. Identifying the physical reasons for the observed irreversibility, the origin of irreversibility, would contribute greatly to understanding the apparent asymmetry of nature in time, despite nature’s apparently perfect symmetry in space.

In 1927, Arthur Stanley Eddington coined the term “Arrow of Time” in his book The Nature of the Physical World. He connected “Time’s Arrow” to the one-way direction of increasing entropy required by the second law of thermodynamics. This is now known as the “thermodynamic arrow.”
(Nature of the Physical World, 1927, p.328-9)

In his later work, Eddington identified a “cosmological arrow,” the direction in which the universe is expanding, as shown by Edwin Hubble about the time Eddington first defined the thermodynamic arrow.
New Pathways in Science, 1937, p.328-9)

There are now at least five other proposed arrows of time (discussed below). We can ask whether one arrow is a “master arrow” that all the others are following, or perhaps time itself is just a given property of nature that is otherwise irreducible to something more basic, as is space.

Given the four-dimensional space-time picture of special relativity, and given that the laws of nature are symmetric in space, we may expect the laws to be invariant under a change in time direction. The laws do not depend on position in space or direction, they are invariant under translations and rotations, space is assumed uniform and isotropic. But time is not just another spatial dimension. It enters into calculations of event separations as an imaginary term (multiplied by the square root of minus 1). Nevertheless, all the dynamical laws of motion are symmetric under time reversal.

So the basic problem is – how can macroscopic irreversibility result from microscopic processes that are fundamentally reversible?

[smilaeger]

I may have MISSED it, but...did you ever DIRECTLY ADDRESS said question??

[CoreyAnton]

Hi Bob, Any way you can respond to a question: Is there any difference, in term of negentropy, between the spoken word and the written (or electric) word? In your view, is the written word more negentropic or less negentropic than the spoken word?

[voidisyinyangvoidisyinyang]

Dude - you don't respond to your comments but I think you read them. Some kind of Ivory Tower psychological problem. The "We" you refer to - us - are alive and yet you are projecting symmetric statistical math via the Poisson Bracket onto quantum biology that is based on quantum coherence as negentropy. The reason the future is not experienced in reverse is because that which experiences the future is the nonlocal pilot wave that is noncommutative phase as the 5th dimension. The Logos is actually based on noncommutative math - I studied the secret of the Logos for 30 years. The Logos is the same as the Tai Chi or the "three gunas" of India and is from music theory. As Math professor Luigi Borzacchini has detailed Western math is from music theory - the wrong music theory since Archytas and Plato. Math professor Alain Connes has figured this out as well - the empirically true music theory is noncommutative as a quantum sphere with zero geometric dimension and is an "universal scaling system." The Logos is not symmetrical in time because frequency is to time as momentum is to wavelength as de Broglie figured out - the Law of Phase Harmony. So when we turn light around, time goes to zero but since light has relativistic mass as the hidden momentum energy then momentum is not conserved - and phase velocity is superluminal. You should read Stuart Hameroff's paper on Free Will and Precognition. Precognition is real, just as Kurt Godel explained, based on not having any personal desires and therefore the time travel paradoxes are solved. It is not the ego that time travels but rather the formless awareness itself as the protoconsciousness of the Universe.