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A Note on Boltzmann Brains · Around

2015

A Note on Boltzmann Brains

Nomura, Yasunori

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Understand

Understanding the observed arrow of time is equivalent, under general assumptions, to explaining why Boltzmann brains do not overwhelm ordinary observers.

It is usually thought that this provides a condition on the decay rate of every cosmologically accessible de Sitter vacuum, and that this condition is determined by the production rate of Boltzmann brains calculated using semiclassical theory built on each such vacuum.
We argue, based on a recently developed picture of microscopic quantum gravitational degrees of freedom, that this thinking needs to be modified.
In particular, depending on the structure of the fundamental theory, the decay rate of a de Sitter vacuum may not have to satisfy any condition except for the one imposed by the Poincare recurrence.

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B. Freivogel and M. Lippert, JHEP 12

2008

Cited alongside, same era.

Y. Nomura, F. Sanches and S. J. Weinberg, arXiv:1412.7538 [hep-th]; arXiv:1412.7539 [hep-th]

Cited in the paper.

K. K. Boddy, S. M. Carroll and J. Pollack, arXiv:1405.0298 [hep-th]

Cited in the paper.

A. Almheiri, D. Marolf, J. Polchinski and J. Sully, JHEP 02

2013

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Y. Nomura and S. J. Weinberg, JHEP 10

2014

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