Even if there’s a 99% chance any instant that I’m a Boltzmann brain, my decisions only matter for the remaining 1%, so I may as well take the same decisions anyway. In other words, I don’t behave any differently if the Boltzmann Brain thing is correct, so I don’t have any problem with it.
I’m not entirely sure that’s true. It’s possible for a Boltzmann brain to exist for longer than an instant, so it should be possible for it to make decisions that affect its experiences in, say, the next few seconds. That might be enough to skew your expected value calculations in favor of, say, taking a vial of cocaine that happens to be in front of you...
I have preferences over what happens to Emile on planet Earth, not on what happens to a Boltmann Brain that exists for a few seconds in the Minor Squableen Nebula of Galaxy XJB-819-delta. A Boltzmann Brain would also have preferences on what happens to Emile on planet Earth, so it would want to make the same decisions.
Short answer: Any cosmology that suggests that we’re Boltzmann brains probably has something wrong with it.
Even if there’s a 99% chance any instant that I’m a Boltzmann brain, my decisions only matter for the remaining 1%, so I may as well take the same decisions anyway. In other words, I don’t behave any differently if the Boltzmann Brain thing is correct, so I don’t have any problem with it.
I’m not entirely sure that’s true. It’s possible for a Boltzmann brain to exist for longer than an instant, so it should be possible for it to make decisions that affect its experiences in, say, the next few seconds. That might be enough to skew your expected value calculations in favor of, say, taking a vial of cocaine that happens to be in front of you...
I have preferences over what happens to Emile on planet Earth, not on what happens to a Boltmann Brain that exists for a few seconds in the Minor Squableen Nebula of Galaxy XJB-819-delta. A Boltzmann Brain would also have preferences on what happens to Emile on planet Earth, so it would want to make the same decisions.