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## String Theory

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1. Physicist Finds Loose Thread in String Theory (PhysOrg)
"Paul Romatschke, an associate professor of physics at CU Boulder, has devised an alternative set of tools to those that created string theory's three-quarters dilemma, a mathematical puzzle that has plagued scientists for years and has kept them from fully understanding and proving this possible 'theory of everything.' " 07-19

2. String Theory Basics (SuperStringTheory.com)
Includes the basics for understanding string theory. "Think of a guitar string that has been tuned by stretching the string under tension across the guitar. Depending on how the string is plucked and how much tension is in the string, different musical notes will be created by the string. These musical notes could be said to be excitation modes of that guitar string under tension."

"In a similar manner, in string theory, the elementary particles we observe in particle accelerators could be thought of as the 'musical notes' or excitation modes of elementary strings."

"But the number of string theories has also been shrinking in recent years, because string theorists are discovering that what they thought were completely different theories were in fact different ways of looking at the same theory!" 02-06

3. Superstring Theory (Wikipedia.org)
"Superstring theory is an attempt to explain all of the particles and fundamental forces of nature in one theory by modeling them as vibrations of tiny supersymmetric strings."

"At present, the deepest problem in theoretical physics is harmonizing the theory of general relativity, which describes gravitation and applies to large-scale structures (stars, planets, galaxies), with quantum mechanics which describes the other three fundamental forces acting on the microscopic scale." 10-04

4. Superstrings - A History of String Theory (Schwartz)
Provides a history of how string theory has evolved. 2-05

5. Superstrings - A History of String Theory (Schwartz)
Provides an introduction to superstrings, a unified theory of the universe, including a history of the development of the theory.

6. Superstrings - A History of String Theory (World Science Festival))
Provides an introduction to superstrings, supersymmitry unified theory of the universe, including a history of the development of the theory.

7. Superstrings - String Theory (PBS.org - NOVA)
"In this excerpt from his book The Elegant Universe, Brian Greene explains why string theory might hold the key to unifying the four forces of nature." 10-03

8. Superstrings - String Theory (Schwartz)
Provides an introduction to superstrings, a unified theory of the universe, including a history of the development of the theory, key developers of the theory, and more.

9. Universe or Multiverse and String Theory (World Science Festival))
Provides an introduction to superstrings and a unified theory of the universe, including a history of the development of the theory.

10. Witten, Edward and "M" Theory (BBC News)
"In the last few years, physicists have learned that the different string theories discovered and studied in different ways are limiting cases of a single, more powerful theory, known as M theory. "M" stands for magic, mystery, or matrix, according to taste. Some of these developments will be explained in this lecture."

"Edward Witten, professor of physics at the Institute for Advanced Study in Princeton, N.J., is arguably the premier theoretical physicist of our time. Renowned for his many contributions to particle physics and string theory, Witten has almost single-handedly constructed a new branch of mathematical physics." 11-03

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