Transient Observers and Variable Constants, or Repelling the Invasion of the Boltzmann's Brains

Details Transient Observers and Variable Constants, or Repelling the Invasion of the Boltzmann's Brains Transient Observers and Variable Constants, or Repelling the Invasion of the Boltzmann's Brains

2007-03-12

arxiv.org/abs/hep-th/0703115v5

JCAP 0706:001,2007

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, LaTeX; v2: added references; v3: more discussion of setting, alternative approaches, now 5 pages; v4: added discussio

Scientific paper

10.1088/1475-7516/2007/06/001

If the universe expands exponentially without end, ``ordinary observers'' like ourselves may be vastly outnumbered by ``Boltzmann's brains,'' transient observers who briefly flicker into existence as a result of quantum or thermal fluctuations. One might then wonder why we are so atypical. I show that tiny changes in physics--for instance, extremely slow variations of fundamental constants--can drastically change this result, and argue that one should be wary of conclusions that rely on exact knowledge of the laws of physics in the very distant future.

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