Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: is there any negative concept of time?
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abhishek sinha (2629)

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All of u are going too much beyond our scope .
 
 Ok, I can point out two theories which are contradicting involving the very concept of the direction of time .
 
Yes , they are 2nd Law of thermodynamics & Maxwell,s eqn of electrodynamics.
 
2nd law states that entropy increases with time .  ( according to Hawking it is because time itself is measued in the direction of increasing entropy . !!!! )
 
So if I want to reverse the arrow of time 2 nd law would no longer hold . So thermodynamics says that time has only one direction .
 
Now if u solve maxwell's wave eqn U WILL GET TWO SOLNS IN ONE OF WHICH THE WAVE MOVES BACKWARD IN TIME .  Now generally this part of soln is neglected because it is considered to be ' UNPHYSICAL '. But , never mind ,this soln is COMPLETELY CONSISTENT WITH MAXWELL'S EQN .
 
In fact this backward moving wave was used by Feynmann ( Of course , the original one !!!!!!!!!!! ) himself in explaining the radiation reaction of electron .
 
Now tell me what to do ?  
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