First off please bear with me that I am entering the realm of learning about both of these topics. However from what I have gathered objectivism says that reality is the only reality and that there is nothing but, thus being no point in finding something else (most religions in regards to their "afterlife"), you know, A is A. So my understanding of this is that unless something can be proven then it does not exist. As stated on the Ayn Rand Lexicon, "Reality exists as an objective absolute—facts are facts, independent of man’s feelings, wishes, hopes or fears." This would be saying that something such as the Quantum Immortality theory (basically says that if a person dies in a "schrodinger's box" then they will simply wake up in a tangent created by a superposition dividing) which can not be proven, at least to my knowledge, would not be considered reality and thus should not be sought after to prove and explain. SOMEWHAT SPOILERS AHEAD TO ATLAS SHRUGGED I'm at the part now where Dagny is talking to Galt and all of her old friends and his new friends on why they left it all behind. So if stuff like this is further explained and answered later in this book or in The Fountainhead please answer starting off saying that, then continue to answer if it dives deeper than what the book explains.