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Which arrow is fundamental?

How are the different physical time arrows related? Is there one 'master arrow' that gives rise to the others. The two main candidates - the cosmological and thermodynamic arrows - are considered below.

 

 
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The Arrow of Time 
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The physics of time
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Which arrow is fundamental?
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Other arrows
↳
Cosmological arrow is basic
↳
Thermodynamic arrow is basic
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The cosmological arrow
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The thermodynamic arrow
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