The Skeptical Teacher

Musings of a science teacher & skeptic in an age of woo.

Archive for September 16th, 2010

Testing String Theory? How Real Science Progresses

Posted by mattusmaximus on September 16, 2010

Something very interesting has happened recently in the world of theoretical physics.  One of the hottest ideas around is the notion of so-called string theory: it’s the idea that all matter & energy in the universe – from the electrons & quarks that make up atoms to photons of light to everything in between – is composed of ultra-tiny strings of vibrating energy.  It’s a marvelous and mathematically elegant idea, one which many theoretical physicists believe holds the key to unifying the fundamental forces of nature, but it suffers from a big flaw: these strings are, according to the theory, so small that we have no way to experimentally detect them. Thus, if such is the case, then many physicists & critics of string theory have equated the idea with a dragon in the garage, an unfalsifiable notion which isn’t subject to scientific investigation.  I have placed myself into this category of string theory skeptics for quite a long time for this very reason…

… up until now, that is.  It seems that the question of whether or not string theory is testable, and therefore real science, has been answered.  That’s because recent theoretical analysis of string theory has revealed that it makes unique predictions which can be tested in a controlled laboratory setting having to do with a weird phenomenon called quantum entanglement. Up until now, physicists haven’t had a good way to really predict the behavior of systems that coupled via quantum entanglement, but it seems that some aspects of string theory can shed some light on this…

New study suggests researchers can now test the ‘theory of everything’

String theory was originally developed to describe the fundamental particles and forces that make up our universe. The new research, led by a team from Imperial College London, describes the unexpected discovery that string theory also seems to predict the behaviour of entangled quantum particles. As this prediction can be tested in the laboratory, researchers can now test string theory.

Over the last 25 years, string theory has become physicists’ favourite contender for the ‘theory of everything’, reconciling what we know about the incredibly small from particle physics with our understanding of the very large from our studies of . Using the theory to predict how entangled quantum particles behave provides the first opportunity to test string theory by experiment.

“If experiments prove that our predictions about quantum entanglement are correct, this will demonstrate that string theory ‘works’ to predict the behaviour of entangled quantum systems,” said Professor Mike Duff FRS, lead author of the study from the Department of Theoretical Physics at Imperial College London.

“This will not be proof that string theory is the right ‘theory of everything’ that is being sought by cosmologists and particle physicists. However, it will be very important to theoreticians because it will demonstrate whether or not string theory works, even if its application is in an unexpected and unrelated area of physics,” added Professor Duff. …

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