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String Notes - Coggle Diagram
String Notes
Episode 2
Local field theory can describe strong ints
Quantum gravity doesn't work in LFT
You cant have a gauge-invariant local field
Local fields can't be functions of space time
Massless spin 2 particles aren't supposed to exist
Their existence couldn't be disproven
Feynman diagrams
Diagrams of photons/electrons interacting
Feynman vertices
Where stuff changes
Infinties show up at vertices
These can be removed in string theory
Effects of string theory
String theory is simpler than quantum field theory
String theory decides the spacetime dimension
The space time dimension was 10
More space for extra vibrations/particles
String theory decides the symetries
general covariance and gauge symmetry were re-discovered
Other
Sting theory is continuing to grow
Questions
QCD?
Quantizing gravity?
Gauge-invarience?
Episode 1
Veneziano amplitude
Approximate for the scattering of new ions
Hadron physics
Strong interactions were not described in local quantum field theory
The known scattering formulas only applied to finite resonances
Meson is a sting with charged ends
Charged ends are quarks
Resonances are vibrations of the string