A “Boltzmann Brain” is a hypothetical object predicted by Boltzmann’s brain paradox. It suggests that the universe, which is expected to have an infinite amount of time, will eventually become dominated by random fluctuations, eventually producing a single brain with false memories of a universe existing around it, while all other matter and energy has dissipated. This brain would have originated from the thermal fluctuations of empty space, developing its consciousness by random chance, in accordance with the laws of thermodynamics. The hypothesis of Boltzmann brains has sparked much debate amongst cosmologists, spawning several arguments and counterarguments regarding its plausibility.

See also: emergence, evolutionary psychology, free will, quantum foundations