Are there Boltzmann brains in the vacuum

Understand

"Boltzmann brains" are human brains that arise as thermal or quantum fluctuations and last at least long enough to think a few thoughts.

• In many scenarios involving universes of infinite size or duration, Boltzmann brains are infinitely more common than human beings who arise in the ordinary way.
• Thus we should expect to be Boltzmann brains, in contradiction to observation.
• We discuss here the question of whether Boltzmann brains can arise as quantum fluctuations in the vacuum.