Caledonian2 comments on Timeless Physics - Less Wrong

32 Post author: Eliezer_Yudkowsky 27 May 2008 09:09AM

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Comment author: Stirling_Westrup 27 May 2008 06:46:25PM 0 points [-]

The thing about the concept of a block universe that bothers me is the question of the reversibility of the Schrรถdinger equations. I have been told that they are so, but I have to take it on faith that they are completely time-symmetric since they are just beyond where I am comfortable in Mathematics.

So, if one looks at the current configuration space for a point of 'now', and works the equations backwards, does one get only one possible past, or an large number of possible pasts? If its the former, how can one claim that the equations are time symmetric? If its the latter, why don't we remember all of those quantum possibilities?