User talk:Mkstalal

Special relativity Vs. Time dilation:

by M.K.S. Talal

Lets consider the [Twin paradox]http://en.wikipedia.org/wiki/Twin_paradox example. According to this, the earth-twin will be older than the ship-twin by the time he reaches earth. Now, how is that possible? no that's not possible, this is where the problem lies. Ok, here, the destination point from earth is d and the required time to reach destination is 5 light years.

Now the ship-twin will travel the midway to the destination at the speed of light so 0.5d will take 2.5 light years for the ship-twin and by the time the light travels back to the earth-twin, it will be 5 years for him and when he will look at that image of ship-twin he will see that while it has been 5 years for him, on the other hand it is 2.5 years for his ship-twin. So relatively it's half the time slower than in earth. By this time, the ship-twin will reach the destination in 2.5 years while the light from the middle 0.5d position will get to earth in 2.5 years to. Again, the light image will not stop coming from ship-twin, rather the earth-twin will continually see his twin growing old in the next 2.5 years until he reaches the destination, but this time not at half the clock rate, but equal. So, it will be 7.5 years for the earth-twin and 5 years for the ship-twin. Again by the time he watches this, the actual ship-twin will come back in the middle at 0.5d in 2.5 years. But this time he is traveling back at the speed of light and also aging continually older. Now suddenly at 0.5d position while the earth-twin is watching the 5th year of his ship-twin, he will stop receiving any image, because, he the light image of the ship-twin haven't reached him yet. But, nothing to worry, 'cuz after 2.5 years later the ship twin along with his light and 10 years of age will come back to earth, when the earth-twins age will also be 10 years. So, we can see, there is no time dilation in the actual event, but yes relatively to earth-twin there was; which was high at the start of the journey and lower at the end of the journey when the ship-twin reached it's destination point d.

Conclusion: No Time Travel is going to happen because of some relative time dilation, 'cuz it's just relative it's not actual time dilation.