Hi Guys generally when you evaluate the 3 open string tachyon tree level amplitude in CFT, you do a conformal transformation mapping the worldsheet to the upper half of the complex plane and the ...
What's the significance between a closed and open string? And how do strings interact with one another?
I'm somewhat familiar with standard model physics but completely clueless about string theory. If a string is a vibrating strand of energy, then what is the significance of a closed loop of string? ...