Tuesday 28 January 2020

black holes - Why is information indestructible?



I really can't understand what Leonard Susskind means when he says in the video Leonard Susskind on The World As Hologram that information is indestructible.


Is that information that is lost, through the increase of entropy really recoverable?


He himself said that entropy is hidden information. Then, although the information hidden has measurable effects, I think information lost in an irreversible process cannot be retrieved. However, Susskind's claim is quite the opposite. How does one understand the loss of information by an entropy increasing process, and its connection to the statement “information is indestructible”.


Black hole physics can be used in answers, but, as he proposes a general law of physics, I would prefer an answer not involving black holes.




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