Why low entropy in the past?
How do we account for the low entropy of the early universe reflected in the extreme - but not perfect - homogeneity of the distribution of matter and energy shortly after the Big Bang? When gravity is prominent - as in the early universe - a smooth distribution is unstable and of low entropy.
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The Arrow of Time  »The Arrow of Time 
The physics of time »The physics of time
The thermodynamic arrow »The thermodynamic arrow
Why do we see an entropy gradient? »Why do we see an entropy gradient?
Asymmetric boundary condition »Asymmetric boundary condition
Past hypothesis »Past hypothesis
Why low entropy in the past?
Anthropic selection »Anthropic selection
A brute fact »A brute fact
Cyclical universe »Cyclical universe
Dynamic selection of string vacua »Dynamic selection of string vacua
Inflationary universe »Inflationary universe
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