A 2016 particle revealed a parallel universe. Or not.

But wait: Time runs backward there. Other physicists are not convinced.

Image source: Thomas Daems/Shutterstock/Big Think
  • NASA's ANITA observatory searches for neutrinos traveling with cosmic rays as they arrive on, and crash into, Earth.
  • ANITA detected high-energy particles that seemed to be coming out of the Earth, which isn't supposed to be possible.
  • After years of inconclusive hypotheses, the ANITA team published a paper claiming the particles reveal a parallel universe where time runs backwards.

An Antarctic particle-observation experiment conducted in Antarctica in 2016 has produced what its scientists say may be evidence of a second universe parallel to ours, an anti-universe in which time runs backwards. On the other hand, maybe not. While there's little doubt about what the searchers saw, nobody has quite figured out what it was, and some imply the parallel-universe idea may be as much an expression of frustration over the unresolved mystery as a serious hypothesis.

Here's what happened

ANITA getting ready

Image source: Balloon Program Office/NASA

Ever since Austrian physicist Victor Hess realized that cosmic rays were bombarding the Earth from above in 1912, scientists have sought out ways in which they can be detected and studied without the distortion introduced by Earth's magnetic field. Fortunately, cosmic rays are accompanied by a detectable beacon: neutrinos, and neutrinos don't care about magnetic fields — they travel in a simple straight line.

Antarctica presents an interesting opportunity to learn about cosmic waves. When low-energy neutrinos hit the ground ice there, they pass right through along with their cosmic-ray partners. However, high-energy neutrinos, such as those that accompany cosmic rays, can't pass through and crash into the ice, producing a shower of charged particles.

NASA's Antarctic Impulsive Transient Antenna (ANITA) is designed to detect and measure these bursts, allowing scientists to figure out a neutrino's trajectory, and thus its source and that of its accompanying cosmic ray. ANITA is a collection of antennas sent aloft in a large balloon some 1-4 kilometers above McMurdo Base in Antarctica. It's made three month-long flights so far, hunting for signs of neutrino impacts over a million square kilometers of ice, but the only thing ANITA detected are what seemed to be bursts of background noise.

However, as disappointed scientists waited on the surface during ANITA's third flight, they decided to go over the data from the first two missions one more time to see if there was anything they missed. The researchers found, in what they'd previously assumed to be noise, the signature of a strangely high-energy particle, with a charge of 0.6 and 0.56 exaelectronvolts (a billion billion electronvolts).

The particle's trajectory is what made no sense: It apparently didn't come down from space — it was exploding outward from underneath the ice. Since high-energy particles can't pass through the Earth, ANITA's observation has puzzled the physics community for the last couple of years. (Since that time, three other similar particles have been observed by ANITA.)

In March, since no definitive explanation has yet been put forward, experimental particle physicist Peter Gorham of the University of Hawaii and principle investigator with ANITA and his colleagues provided one. It's a stunner: The paper asserts that ANITA caught a "right-handed neutrino." The detection of such a particle would signify the presence of an anti-universe. In this scenario, the particle's direction would be explained as a reversed-in-time arrival of the particle on Earth from space.

Just a sec, or anti-sec...

Image source: NASA

"Extraordinary claims require extraordinary evidence." — Carl Sagan

In the case of the hypothesis proposed ANITA's team, theirs is more a matter of an extraordinary lack of proof in the form of convincing explanations that would be justify an extraordinary claim. Sagan would likely be unimpressed.

"We are absolutely sure that there is new physics out there to be found," radio Astronomer Clancy James tells Jackson Ryan at c/net, explaining why it's not shocking that physicists can't explain the four reported observations detailed in the team's paper. Even so, astrophysicist Geraint Lewis point out, "There are a number of potential candidate particles that could account for the results from ANITA." There is also a theory that the geomagnetic current in the Antarctic ice distorts particle trajectories, potentially producing a head-scratching detection such a ANITA's.

It's also true that one approach to an unanswerable question is to think outside of the box. "In such a situation you start exploring even more extreme possibilities," says Ekers.

While astroparticle phenomenologist Pat Scott admits the anti-universe explanation is "plausible" — an interesting word in the mind-blowing arena of physics — he cautions, "There's nothing that necessarily makes it a detection of a parallel universe."

Ron Ekers, of Australia's national space agency, suggests Gorham and his colleagues may just be sick of waiting for another answer: "The unusual ANITA events have been known and discussed since 2016. After four years there has been no satisfactory explanation of the anomalous events seen by ANITA so this is very frustrating, especially to those involved." He suggests the anti-universe idea is "a somewhat cheeky explanation ... born out of the frustration of having nothing else that worked."

Concludes Lewis, "Whilst parallel universes sound exciting and sexy when discussing the ANITA signal, alternative ideas are still on the table."

For now, the reaction of the larger physics community suggests we'll have to take the anti-universe theory with at least a grain of salt and consider ANITA's baffling observations a genuinely intriguing puzzle awaiting a provable solution.

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It looks like a busy hurricane season ahead. Probably.

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Surprising Science
  • Before the hurricane season even started in 2020, Arthur and Bertha had already blown through, and Cristobal may be brewing right now.
  • Weather forecasters see signs of a rough season ahead, with just a couple of reasons why maybe not.
  • Where's an El Niño when you need one?

Welcome to Hurricane Season 2020. 2020, of course, scoffs at this calendric event much as it has everything else that's normal — meteorologists have already used up the year's A and B storm names before we even got here. And while early storms don't necessarily mean a bruising season ahead, forecasters expect an active season this year. Maybe storms will blow away the murder hornets and 13-year locusts we had planned.

NOAA expects a busy season

According to NOAA's Climate Prediction Center, an agency of the National Weather Service, there's a 60 percent chance that we're embarking upon a season with more storms than normal. There does, however, remain a 30 percent it'll be normal. Better than usual? Unlikely: Just a 10 percent chance.

Where a normal hurricane season has an average of 12 named storms, 6 of which become hurricanes and 3 of which are major hurricanes, the Climate Prediction Center reckons we're on track for 13 to 29 storms, 6 to 10 of which will become hurricanes, and 3 to 6 of these will be category 3, 4, or 5, packing winds of 111 mph or higher.

What has forecasters concerned are two factors in particular.

This year's El Niño ("Little Boy") looks to be more of a La Niña ("Little Girl"). The two conditions are part of what's called the El Niño-Southern Oscillation (ENSO) cycle, which describes temperature fluctuations between the ocean and atmosphere in the east-central Equatorial Pacific. With an El Niño, waters in the Pacific are unusually warm, whereas a La Niña means unusually cool waters. NOAA says that an El Niño can suppress hurricane formation in the Atlantic, and this year that mitigating effect is unlikely to be present.

Second, current conditions in the Atlantic and Caribbean suggest a fertile hurricane environment:

  • The ocean there is warmer than usual.
  • There's reduced vertical wind shear.
  • Atlantic tropical trade winds are weak.
  • There have been strong West African monsoons this year.

Here's NOAA's video laying out their forecast:

But wait.

ArsTechnica spoke to hurricane scientist Phil Klotzbach, who agrees generally with NOAA, saying, "All in all, signs are certainly pointing towards an active season." Still, he notes a couple of signals that contradict that worrying outlook.

First off, Klotzbach notes that the surest sign of a rough hurricane season is when its earliest storms form in the deep tropics south of 25°N and east of the Lesser Antilles. "When you get storm formations here prior to June 1, it's typically a harbinger of an extremely active season." Fortunately, this year's hurricanes Arthur and Bertha, as well as the maybe-imminent Cristobal, formed outside this region. So there's that.

Second, Klotzbach notes that the correlation between early storm activity and a season's number of storms and intensities, is actually slightly negative. So while statistical connections aren't strongly predictive, there's at least some reason to think these early storms may augur an easy season ahead.

Image source: NOAA

Batten down the hatches early

If 2020's taught us anything, it's how to juggle multiple crises at once, and layering an active hurricane season on top of SARS-CoV-2 — not to mention everything else — poses a special challenge. Warns Treasury Secretary Wilbur Ross, "As Americans focus their attention on a safe and healthy reopening of our country, it remains critically important that we also remember to make the necessary preparations for the upcoming hurricane season." If, as many medical experts expect, we're forced back into quarantine by additional coronavirus waves, the oceanic waves slamming against our shores will best be met by storm preparations put in place in a less last-minute fashion than usual.

Ross adds, "Just as in years past, NOAA experts will stay ahead of developing hurricanes and tropical storms and provide the forecasts and warnings we depend on to stay safe."

Let's hope this, at least, can be counted on in this crazy year.

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