Boltzmann Brains--I'd Rather See Than Be One

TL;DR

The paper argues that Boltzmann Brains are not a genuine problem for the flat-lambda cosmological model because they are observer-dependent phenomena and cannot be considered real observers, thus preserving the model's validity.

Contribution

It introduces an observer-dependent perspective on Boltzmann Brains, showing they are not truly real and do not threaten the standard cosmological model.

Findings

Boltzmann Brains are observer-dependent and not real particles.

The rate of tunneling events producing ordinary observers exceeds that of Boltzmann Brains.

Boltzmann Brains do not pass the Turing test for intelligence.

Abstract

A perceived problem with the standard flat-lambda model is that in the far future spacetime becomes an exponentially expanding de Sitter space, filled with Gibbons-Hawking thermal radiation, and given infinite time there will appear an infinite number of Boltzmann Brains (BB's) per finite co-moving volume today. If BB's outnumber ordinary observers by an infinite factor, why am I not one? This Gibbons-Hawking thermal radiation is observer dependent--due to observer dependent event horizons. Different observers moving relative to each other will see different photons, and different BB's. I will argue that the only particles that are real are the particles dredged out of the quantum vacuum state by particular real material detectors. (In much the same way, accelerated detectors dredge thermal Unruh radiation out of the Minkowski vacuum due to their observer dependent event horizons.) Thus, I may see a thermal BB, but cannot be one. Observer independent BB's can be created by quantum tunneling events, but the rate at which ordinary observers are being added to the universe by tunneling events to inflating regions exceeds the rate for producing BB's by tunneling by an infinite factor. I also argue that BB's do not really pass the Turing test for intelligent observers. Thus, the standard flat-lambda model is safe.