Mirror, mirror

The idea of there being a mirror universe has been a staple of science fiction for as long as I can remember.  Many people think immediately of evil Spock with a beard, but my first contact with the idea was when I was seven and first saw the episode of Lost in Space called "The Anti-Matter Man."  The two universes were connected by a creepy, surreal, fog-covered bridge:

The characters from our universe had duplicates in the other -- evil, of course, with an evil, amoral John Robinson, a trash-talking Robot, and a version of Major Don West who looked like he was an escapee from an institute for the criminally insane.

Oh, and the evil Major West had a beard.  Of course.

It was definitely one of their more atmospheric and effective episodes.  Not that there was that much competition in that regard, considering that the previous episode, "Castles in Space," featured a cringe-worthy pseudo-Mexican bounty hunter (complete with a sombrero) who is searching for a runaway princess Dr. Smith had set free from a block of ice by covering it with an electric blanket, and said bounty hunter (did I mention he had silver skin?) gets the Robot drunk by pouring tequila onto his circuit boards.

For the record, I didn't make any of that up.

This whole thing comes up because there are some physicists who are trying to demonstrate the existence of a mirror universe -- an unseen parallel reality coexisting with our own -- and that this might explain the mysterious "dark matter" that seems to permeate all of space, but which no one's been able to detect other than by its gravitational signature.

A team led by physicist Leah Broussard has designed an experiment at Oak Ridge National Laboratories to see if she can find evidence of a mirror reality, looking for neutrons that have been transformed into particles with the opposite parity.  In a paper in arXiv, the authors write:

The theory of mirror matter predicts a hidden sector made up of a copy of the Standard Model particles and interactions but with opposite parity.  If mirror matter interacts with ordinary matter, there could be experimentally accessible implications in the form of neutral particle oscillations.  Direct searches for neutron oscillations into mirror neutrons in a controlled magnetic field have previously been performed using ultracold neutrons in storage/disappearance measurements, with some inconclusive results consistent with characteristic oscillation time of τ∼10~s.  Here we describe a proposed disappearance and regeneration experiment in which the neutron oscillates to and from a mirror neutron state.

What Broussard is doing is to fire a beam of electrons past a powerful magnet and into a wall.  If her idea is correct, the collision will cause some of the electrons to transform into their mirror versions, and appear on the other side of the wall.

She got her idea from a peculiarity that has been observed in neutron decay -- that in a beam such as the one Broussard is using, neutrons have an average life that is ten seconds longer than if they're simply at rest in a laboratory.  There's no Standard-Model explanation of why this should be; all neutrons should behave in exactly the same way.  But Broussard says that this discrepancy is exactly what you'd expect if some of the neutrons in the beam are being transformed into their mirror versions -- and then become invisible to ordinary detectors.

Even Broussard admits that the idea is kind of far-fetched, but given that every other effort to elucidate the nature of dark matter -- or even establish its existence beyond its gravitational effects -- has met with zero success, it's worth looking at.

So it'll be interesting to see what turns up.  I can't help but hope that she gets positive results, because it's about time we finally get something concrete about dark matter.  Besides, the idea of there being a mirror universe is pretty cool.  Even if that means we might have to watch out for evil Major West with a beard.

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This week's Skeptophilia book recommendation is about a subject near and dear to me: sleep.

I say this not only because I like to sleep, but for two other reasons; being a chronic insomniac, I usually don't get enough sleep, and being an aficionado of neuroscience, I've always been fascinated by the role of sleep and dreaming in mental health.  And for the most up-to-date analysis of what we know about this ubiquitous activity -- found in just about every animal studied -- go no further than Matthew Walker's brilliant book Why We Sleep: Unlocking the Power of Sleep and Dreams.

Walker, who is a professor of neuroscience at the University of California - Berkeley, tells us about what we've found out, and what we still have to learn, about the sleep cycle, and (more alarmingly) the toll that sleep deprivation is taking on our culture.  It's an eye-opening read (pun intended) -- and should be required reading for anyone interested in the intricacies of our brain and behavior.

[Note: if you purchase this book using the image/link below, part of the proceeds goes to support Skeptophilia!]

Shrouded in pseudoscience

I hate to break it to you, LiveScience, but in the interest of accuracy, it's probably time to take the word "Science" out of the name of your website.

What you're promoting isn't really science, any more than The History Channel has anything even remotely to do with history.  You're passing along to the public the idea that science is this mushy, hand-waving pursuit, where you can do an "experiment" to support an idea you'd already decided was true, generate essentially nothing in the way of data, and then claim that your results support whatever your original contention was.

I say this in light of a recent story called "Shroud of Turin: Could Ancient Earthquake Explain Face of Jesus?"  If the very title makes you suspicious, then good; you're starting out from the right vantage point.

Let's begin with the facts.  The Shroud of Turin is a piece of linen cloth that has been preserved for centuries as a holy relic -- supposedly the sheet that covered Jesus' body after the crucifixion.  It shows the image of a naked man, with wounds similar to those described in the bible.

[image courtesy of the Wikimedia Commons]

The problem is, the linen cloth was carbon-14 dated -- a step that the religious powers-that-be resisted for decades -- and it was conclusively shown to date to around 1350 C.E.  It is, put simply, a fake.  So you'd think that would be that.

As we've seen before, that is never that when religion enters the picture.

The article in LiveScience tells about a study headed by Alberto Carpinteri of the Politecnico di Torino, in Turin, Italy, which discovered that when you crush rocks using a mechanical press, it can cause a brief emission of neutrons.  From that single piece of information, he concludes the following:

• Earthquakes can therefore be associated with neutron emissions.
• The neutrons could interact with nitrogen atoms in the linen cloth (or in anything else, presumably), and mess up the carbon-14 dating protocol, causing it to give a wrong answer.
• The neutrons could also have burned a pattern into the cloth as they passed through it.  Because the cloth was wrapped around a human body, it would have caused an image to appear on it, much like an x-ray.
• The bible says that there was an earthquake around the time of Jesus' resurrection, and the "stone rolled back from the tomb."  [Matthew 28:1-2]
• So: the Shroud of Turin is actually the burial cloth of Jesus.  Therefore god and the Catholic Church and all of the rest of it.  q.e.d.

Oh, come on, now.  This qualifies as science?  It's about as bad an example of assuming your conclusion as I've ever seen.  And if earthquakes interfered with carbon-14 and nitrogen-14 levels, then radiocarbon dating would never work, since earthquakes happen basically all the time, all over the Earth.  And yet carbon-14 dating has been shown to be extremely accurate, over and over again.

Funny thing, that.

So you have to wonder why Carpinteri et al. don't just say, "It was magic, and I believe it," and be done with it.  Why all of the scientific trappings?

Well, I know the answer, of course; people these days are getting a little iffy in the firmness of their religious convictions, and science is beginning to hold more sway over people's minds than religious authority does.  If you can convince folks that the science supports religion, you've pulled 'em right back in.

To LiveScience's credit, at least they took the time to talk to an actual scientist, geochemist Gordon Cook of the University of Glasgow.  Cook, unsurprisingly, was dubious.  "It would have to be a really local effect not to be measurable elsewhere," Cook said.  "People have been measuring materials of that age for decades now and nobody has ever encountered this."

However, even though they quoted Cook, the fact that LiveScience chose to publicize this non-science means that they're giving it unwarranted credence, and that's just irresponsible.  A "study" like this wouldn't make it through the first round of peer review.  Carpinteri and his team are relying on press statements -- and sites like LiveScience -- to publicize what is, at its heart, a religious statement of faith.

So the whole thing is a little frustrating.  It won't change anything, probably; the scientists will almost certainly just roll their eyes and go back to what they were doing, and the religious people who want to believe in the Shroud's relic status will continue to believe.

But I maintain: LiveScience, The History Channel, The Discovery Channel, and other popularizers of a pseudoscientific worldview are not doing science any favors by convincing the public that this sort of foolishness deserves to be considered seriously.  I'd almost rather that they stick to Bigfoot, UFOs, and pieces about how the Vikings were alien time-travelers.  At least that stuff is mildly entertaining.