In 2003, the philosopher Nick Bostrom—famous for his theories on the threat of AI “superintelligence”—posited that humanity may be living inside a simulation. Almost two decades later, the astronomer David Kipping performed some calculations and put the odds at 50-50. “In simulation, anything can happen,” AJ says. “You could have different servers—one server hasn’t been updated, some people are seeing one version, some people are seeing the other.” It is also possible, AJ argues, that we exist in a multiverse—an idea first floated by the physicist Hugh Everett III in the 1950s. If people are somehow traveling between these parallel universes, then they may have memories from different worlds. Both of these theories are recurrent in the Mandela effect community online.
And yet AJ doesn’t find these explanations entirely fulfilling: “If we jumped universes, why would there be residue?” Instead, he’s been diving into a combination of the theoretical physicist John Archibald Wheeler’s concept of the Participatory Anthropic Principle (PAP)—which suggests, controversially, that the act of observation creates reality—and the Nobel Prize–winning physicist Eugene Wigner’s “friend” experiment, which theorized that two observers can experience two different realities. AJ believes that physicists’ own work may be affecting the universe: “It’s almost like you’re changing the parameters of reality itself by digging deeper.”
There is still so much that the experts themselves can’t explain about quantum physics, so it’s no wonder that laypeople get confused. The internet offers myriad rabbit holes to go down, some of them legitimate and some of them less so. Things are complicated further when YouTubers and internet commenters who aren’t well versed in the science take specific, highly complex theories and experiments and try to apply them to other phenomena, even if there is no concrete evidence they’re related. So I set about emailing physicists, simply to see whether they believe it might be remotely possible that quantum physics could, in fact, explain the Mandela effect.
Numerous academics replied telling me they had nothing to say on the topic; Bostrom’s office said he was unavailable. I asked the theoretical physicist Carlo Rovelli—who has been labelled one of the world’s 50 top thinkers—whether he has any thoughts about Mandela effect believers’ quantum-physics-related theories. “Yes, definitely,” he replied. “They are all total bullshit! There are few things about which I am totally convinced. This is one.”
I contacted the University of Oxford physicist David Deutsch—often called the “father of quantum computing”—and listed the theories believers think may explain the Mandela effect, including parallel universes, simulations, the holographic principle, PAP, and Wigner’s friend idea. “Considered as explanations of the Mandela effect, none of those follow from quantum theory, and none of them constitute a rational speculation beyond it,” he said. Johns Hopkins University professor and physicist Sean M. Carroll concurs: “I cannot imagine how any of those phenomena could be in any way related to the Mandela effect.”
Melvin Vopson, an associate professor of physics at the University of Portsmouth who has conducted research on the simulation theory, admits he has experienced the Mandela effect himself but doesn’t attribute the phenomenon to glitches in the simulation: That’d be a “cheap explanation,” he says.
Nevertheless, scientists waving away these explanations could have a detrimental effect: In the absence of expert engagement, there are plenty of people online who can bolster believers’ views. AJ is not surprised by these responses: “I just don’t think that physicists have given it a real hard look,” he says, “because they’re already certain that it’s explainable otherwise.”
Bainbridge, for her part, thinks her study at least disproves the theory that we’ve been jumping between different universes. When she took those study participants who weren’t familiar with certain logos and mascots and showed them the correct version for the first time, she tested their memory by asking them to redraw the image only moments later, and still some drew the Mandela effect version.