Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-03-13
Proc. MSTP (2004)
Physics
High Energy Physics
High Energy Physics - Theory
Lectures at the Mini School in Theoretical Physics at the Government College, Kottayam, India (Jan 2004), v2: references added
Scientific paper
It is hoped that these lectures will give a point of entry into that vast web of related ideas that go under the name "string theory". I start with a more or less qualitative introduction to gravity as a field theory and sketch how one might try to quantize it. Quantizing gravity using the usual techniques of field theory will turn out to be unsuccessful, and that will be a motivation for trying an indirect approach: string theory. I present bosonic string theory, quantize the closed string in the light cone gauge and show that one of the states in the closed string Hilbert space can be interpreted as a graviton. I will end with some general qualitative ideas on slightly more advanced topics.
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