- You've probably heard about the recent observations of the star KIC 8462852. This star, over 1000 ly away, was observed by the Kepler planet-finding mission looking for transit signatures of extrasolar planets. Short version: It seems likely that some very weird objects are in orbit around the star, occasionally occulting large percentages (like more than 20%) of the star's light, far more light blocking and much less periodicity than is typically seen in the other 150,000 stars observed by Kepler. On the one hand, it was suggested that one exotic (though of course unlikely) explanation for this unique phenomenon is megastructures built by an alien civilization. This was freely admitted to be a long-shot, but generated a lot of attention and excitement. Now there has been a followup, where observers have pointed the Allen array at the star, and they have looked from 1-3 GHz for unusual radio emissions, finding nothing. This has generally been handled in the press like it kills the aliens explanation. Actually, if you read the paper, we'd only be able to detect such emissions (assuming they aren't beamed right at us) if the system was putting out something like a petawatt (1015 Watts) in that frequency range. The most likely explanation of the Kepler observations is still some natural phenomenon, but the lack of detectable radio signals is hardly conclusive evidence for that.
- I was previously unaware that the Institute for Quantum Information and Matter at CalTech had a really nice blog, called Quantum Frontiers. There, I learned from John Preskill that Matthew Fisher has been making serious suggestions that quantum information physics may be relevant to biological systems and neuroscience. It's important to look hard at these ideas, but I have to admit my own deep-rooted skepticism that either (1) entangled or superposition states survive in biological environments long enough to play a central role in neurological effects; or (2) that there are biological mechanisms for performing quantum information operations on such states. While nuclear spins are a comparatively isolated quantum system, it's very hard for me to see how they could be entangled and manipulated in some serious way biologically.
- You may need to sit down for this. We probably have not found evidence of parallel universes.
- Nature had a nice Halloween article about six "zombie" ideas in physics that are so-named because they either refuse to die or are "undead". I've talked about the Big G problem before.
Monday, November 09, 2015
Aliens, quantum consciousness, and the like
I've seen a number of interesting news items lately. Here are some that you may have missed.
Posted by Douglas Natelson at 11:27 AM