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Essay on Superstrings | ||
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This is the first 1,000 characters of 766 words (3.06 pages) in the essay titled Superstrings String theory is one of the most exciting and profound developments in modern theoretical physics. Unfortunately it is a highly technical subject that can only be well understood using the tools of Quantum Field Theory. It also doesn t hurt to know some mathematics like Group Theory, Differential Geometry, and Algebraic Geometry. Needless to say this is prohibitive for most people who are far too busy doing other things. String theory is to be a theory of quantum gravity, then the average size of a string should be somewhere near 10 to the 33 centimeter, or about a millionth of a billionth of a billionth of a centimeter. This means that strings are far to small to see by the current technology and so string theorists must devise clever methods to test the theory than just looking for little strings in particle experiments.String theory is a science in progress; we are still learning new and unexpected things about it everyday. Whether or not string theory actually describes the universe that we live in is not known - yet. As we will see it has remarkable potential to do so. Superstrings live in a 10-dimensional spacetime, but we observe a 4-dimensional spacetime. Somehow we need to link the two if superstrings are to describe our universe. To do this we curl up the extra 6 dimensions into a small compact space. This is actually a very old idea dating back to the 1920 s and the work of Kaluza and Klein. This is often called Kaluza-Klein theory. The idea that our univer... |
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Keywords: this means that, string theory, dimensional spacetime, quantum field theory, algebraic geometry, differential geometry, universe, superstring theories, centimeter, kaluza klein theory, perturbation theory, group theory, string theorists, profound developments, spatial dimensions, clever methods, particle experiments, compact space, technical subject