The finding implies that these particles are actually traveling backward in time, suggesting evidence for a parallel universe, according to the Daily Star.ANITA principal investigator Peter Gorham, an experimental particle physicist at the University of Hawaii, suggested that the only way tau neutrino could behave in this way is if it morphs into a different type of particle before passing through Earth and then again. The scientists noted they found particles that could stem from a parallel universe that was also formed during the Big Bang.
"So we published a paper on that, we just suggested that this was in pretty strong tension with the standard model of physics".
The high-energy particles can only be detected coming "down" from space, but the team's ANITA detected heavier particles, so-called tau neutrinos, which come "up" out of the Earth. "Not everyone was comfortable with the hypothesis".
But not everyone is convinced.
"There are a number of potential candidate particles that could account for the results from ANITA", Geraint Lewis, an astrophysicist at the University of Sydney, told CNET.
"The unusual ANITA events have been known and discussed since 2016", said Ron Ekers, an honorary fellow at Australia's national science agency, the Commonwealth Scientific and Industrial Research Organisation.
"While parallel universes sound exciting and sexy when discussing the ANITA signal, alternative ideas are still on the table".
"There's nothing that necessarily makes it a detection of a parallel universe", Scott said.
Others say that if the ANITA team's findings aren't the result of a freaky experimental error, the implications are incredible.