Abstract
In the year 1928, Arthur Eddington, a British physicist, first introduced the word “time’s arrow” to physics. He believed that the arrow of time is vividly recognized by consciousness and insisted that the reversal of this arrow would render the physical world nonsensical. It is widely known that the laws of physics remain unchanged under the combination C, P, and T and that the laws of physics do not change with the flow of time but that is not the case under the operation T alone. This paper focuses on mainly three arrows of time, the thermodynamic arrow of time, the psychological arrow of time and the cosmological arrow of time and discusses the reversal of the arrow of time and its implications.
Highlights
It is a well known paradox that the laws of physics do not change under the flow of time id est the laws of physics are unchanged under the combination of operations C, P, T where C stands for changing particles to antiparticles, P stands for the mirror image and T stands for reversing the direction of motion of all the particles, in effect, running the motion backward
The question that arises is, since the laws of physics remain unchanged under the combinations C, P and T, that must be the case under the operation T alone as well
It is quite hard to imagine since this kind of observation can not be generally made in normal life. This is the simplest example of the backward flow of time. This shows that under the operation T alone, the laws of physics may change contrary to what happened under the condition C, P and T
Summary
It is a well known paradox that the laws of physics do not change under the flow of time id est the laws of physics are unchanged under the combination of operations C, P, T where C stands for changing particles to antiparticles, P stands for the mirror image and T stands for reversing the direction of motion of all the particles, in effect, running the motion backward. The laws of physics governing the behaviour of matter remain unchanged under the operations C, P and T. It means that life would be the same if we were the mirror image of ourselves and made up of antimatter. It is quite hard to imagine since this kind of observation can not be generally made in normal life This is the simplest example of the backward flow of time. THE ARROWS OF TIME In the year 1928, in his book ‘The Nature of the Physical World’, Arthur Eddington first introduced the word “time’s arrow” to physicists. Mainly three different arrows of time would be covered
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