With its talk of D-branes, 10- or 11- dimensional universes and a myriad of possible solutions - 10500 at the last count - string theory looks to many outsiders more like an arcane branch of mathematics that says nothing new about the real world. Not surprisingly, string theory has come in for a lot of criticism in the last year, particularly with the publication of the books Not Even Wrong by US physicist Peter Woit and The Trouble with Physics by Lee Smolin.
But look into string theory in even a little detail, and it is clear why so many young physicists are lured into the field, as this month's special issue of Physics World reveals. First, although the details need to be worked out, string theory naturally unifies quantum mechanics and general relativity - two of the pillars of physics. Second, string theory is very much guided by problems in the real world - such as questions over the quark-gluon plasma and the entropy of black holes - no matter how remote these might seem.
With CERN's Large Hadron Collider (LHC) due to be switched on next year, now is the wrong time to slam string theory for its lack of predictive power. While not being able to prove string theory is right, the discovery of "supersymmetric" particles at the LHC would give it a major boost, as would the discovery of "Kaluza-Klein" particles and possibly even mini-black holes. A flood of cosmological data due in the next few years will also offer new ways to put string theory to the test.
String theorists can be rightly criticized for having in the past oversold their subject by making grandiose claims about "a theory of everything". But the richness of string theory and its increasing contact with the real world give those involved something to shout about. As the views of even many non-string theorists in this issue of Physics World make clear, the theory still holds all the potential it ever did to revolutionize our understanding of the universe.Also in this issue:
Charlie Wallace | alfa
Breakthrough with a chain of gold atoms
17.02.2017 | Universität Konstanz
New functional principle to generate the „third harmonic“
16.02.2017 | Laser Zentrum Hannover e.V.
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
17.02.2017 | Medical Engineering
17.02.2017 | Medical Engineering
17.02.2017 | Health and Medicine