Boltzmann's Brain objection
Given that the probability of low entropy states diminishes exponentially, we would expect to find ourselves in the minimum entropy fluctuation consistent with conscious experience. This would not be the appearance of a whole universe - just a minimal 'Boltzmann brain'.
The case of a Bolzmann brain is depicted by point C in the diagram. Points A and B are the much less probable states in which a conscious brain exists in a whole universe - like the one we (like to think) we live in.

Immediately related elementsHow this works
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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? »Why low entropy in the past?
Anthropic selection »Anthropic selection
Low entropy generators »Low entropy generators
Source of low-entropy states »Source of low-entropy states
Boltzmann-Schuetz hypothesis »Boltzmann-Schuetz hypothesis
Boltzmann's Brain objection
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