Welcome to my Scattering Amplitudes blog. This blog is based on my studies in quantum fields and strings. You will find both formal and informal articles, essays and posts.

It follows that we now want to turn our focus to quantising the string. Following Polchinski, we shall first take the approach of light-cone quantisation (LCQ)...

when we do the Fourier mode expansion for the wave equation, the function must vanish at both ends of the string. So we must expand in terms of cosine's...

The fiducial metric comes from the gauge freedom we're afforded from the symmetries of the action, enabling us "to eliminate the integration over the metric.."

For the Hamiltonian we may write what is below, recalling the conjugate momenta previously defined...

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