so that's the arrow of time.......click to raed.......

The concept C, P, T(Time)

TIME??

 In his book, The Go-Between, L.P Hartley wrote, “The past is a foreign country. They do things differently there-but why is the past so different from the future?” why do we remember the past, but not the future?” in other words, why does the time go forward? Is this connected with the fact that the universe is expanding?

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The laws of physics do not distinguish between the past and the future. More precisely, the laws of physics are unchanged under the combination of operations known as C, P, and T. (C means changing particles for antiparticles. P means taking the mirror images so left and right are swapped for each other. And T means reversing the direction of motion of all particles- in effect, running the motion backward.) The laws of physics that govern the behavior of matter under all normal situations are unchanged under the operations C and P on their own. In other words, life would be just the same for the inhabitants of another planet who were our mirror images and who were made of antimatter. If you meet someone from another planet and he holds out his left hand, don’t shake it. He might be made of antimatter. You would both disappear in a tremendous flash of light.

If the laws of physics are unchanged by the combination of operations C and P, and also by the combination C, P, and T, they must also be unchanged under the operation of T alone. Yet, there is a big difference between the forward and backward directions of time in ordinary life. Imagine a cup of water falling off a table and breaking in pieces on the floor. If you make a film of this, you run it backward, you will see the pieces suddenly gather themselves together off the floor and jump back to form a whole cup on the table. You can tell that the film is being run backward because this kind of behavior is never observed in ordinary life. If it were, the crockery manufacturers would go out of business.   

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The explanation that is usually given as to why we don’t see broken cups jumping back onto the table is that it is forbidden by the second law of thermodynamics. This says that disorder or in a scientific way we can say entropy increases with time. In other words, it is Murphy’s Law-things get worse (seriously get worse nowadays). An intact cup on the table is a state of a high order, but a broken cup on the floor is in a disordered state. One can, therefore, go from the whole cup on the table in the past to the broken cup on the floor in the future. But not the other way around.

Arrows of time...

The increase of disorder or entropy with time is one example of what is called an arrow of time, something that gives a direction to time and distinguishes the past from the future. There are at least three different arrows of time. First, there is a thermodynamic arrow of time the direction of time in which disorder or entropy increase. Second, there is the psychological arrow of time. This is the direction of time in which we feel time passes-the direction of time in which we remember the past, but not the future. Third, there is the cosmological arrow time. This is the direction of time in which the universe is expanding rather than contracting.

I know we shall argue the psychological arrow is determined by the thermodynamic arrow and that these two arrows always point in the same direction. If one makes the no boundary condition (assumption) for the universe, they are related to the cosmological arrow of time, though they may not point in the same direction. However, we shall argue that it is only when they agree with the cosmological arrow that why does disorder increase in the same direction of time as that in which the universe expands?

If you guys want me to explain all the arrows of time comment below……………………

the whole concept above is not written by me I just try to explain with the simplest form.

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