# Reverse Universe: Investigating Deductive Conclusions from Reversible Laws

• Vincit
In summary, the conversation discusses the concept of a "reverse universe" where all particles of matter have reversed velocities, creating a universe that runs in reverse. This is possible due to the reversible nature of physical laws governing the motion of particles. However, there is a paradox in that irreversible physical laws, such as thermodynamics, seem to play a role in the real universe but not in the reverse universe. This paradox is explained by the asymmetry of the boundary conditions, specifically the low entropy at the Big Bang. There is also the mystery of small violations of time symmetry on a macroscopic level.
Vincit
"Reverse Universe":

In general, we could say that looking to the ultimate particles of matter, enough physical laws subsist in the reverse universe to determine, from the positions and velocities of all particles of matter at a given instant, the entire past and future of the universe. The result is that, given those physical laws which we assume to remain always true, if we should imagine that, in the real universe, at one given moment, all particles of matter should, while retaining their respective positions, reverse their velocities, it would follow that this would be enough, of itself, to make all particles of matter trace back their previous positions in the reverse order and thus, as it were, create a reverse universe.

In contrast to this, we will see irreversible physical laws, such as thermodynamics(which I will explain). But, this may create a paradox. Thermodynamics is an irreversible physical law, and seems to be the one distinguishing characteristic between the real universe and the reverse universe. At the same time, that law is of such a nature, that, for the ultimate particles of matter, it dues not exist; it is essentially a law concerning transformations of energy of large masses. And yet all large bodies are made up of countless numbers of the ultimate particles of matter, the laws of whose motion are all perfectly reversible. All phenomena of the reverse universe, however strange they may look, are perfectly explicable in terms of the ordinary physical laws as applied to the smallest material particles. It would seem, then, as though there must be some reason in terms of the reversible physical laws why the second law of thermodynamics must be true; that is, the second law of thermodynamics, if true, should be a consequence of the reversible physical laws applicable to ultimate particles. We are, then, confronted with the paradox of having to deduce an irreversible law from perfectly reversible ones.

So will deductive conclusions from reversible laws be reversible?

In a universe with reversable laws, should we not see examples of both processes? We do not, IMO.

What you are describing is http://en.wikipedia.org/wiki/Loschmidt's_paradox
The solution is well-known: while laws of physics are reversible, the boundary conditions (low entropy at the Big Bang) is assymetric. So the 2nd law is explained by the Big Bang.

There is another mystery through, the (very small) direct T-symmetry violation on the macroscopic level.

## 1. What is "Reverse Universe" and how does it relate to deductive conclusions?

"Reverse Universe" is a theoretical concept that explores the idea of a universe where the laws of physics are reversed. This means that cause and effect are switched, and events occur in reverse order. This idea is used to investigate deductive conclusions, as it challenges our understanding of causality and how we make logical deductions based on observable phenomena.

## 2. How do reversible laws play a role in this concept?

In a reverse universe, the laws of physics are reversible, meaning that they can work in both forward and backward directions. This allows us to analyze and understand the effects of reversing causality and how it affects our ability to make deductive conclusions based on observable laws.

## 3. Why is it important to study the concept of "Reverse Universe"?

Studying the concept of "Reverse Universe" allows us to expand our understanding of causality and the limitations of deductive reasoning. It also allows us to explore alternative possibilities and challenge our current understanding of the laws of physics.

## 4. How does this concept relate to the field of science?

The concept of "Reverse Universe" is a theoretical concept that has not yet been proven or observed in our universe. However, it is a valuable tool for scientists to use in thought experiments and simulations to explore the boundaries of our understanding of the laws of physics and causality.

## 5. Are there any real-world applications of this concept?

Currently, there are no real-world applications of the concept of "Reverse Universe." However, the principles and ideas explored in this concept can have implications in fields such as philosophy, theoretical physics, and artificial intelligence, where causality and deductive reasoning are crucial components.

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