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from Part III - The Space-Time Perspective
Published online by Cambridge University Press: 31 March 2022
We start carrying out the programme of covariant quantisation, focussing on the photon and tachyon state of the open string. The photon is used to explain the relation between the world-sheet and space-time perspective by matching properties of the photon state to those of the Maxwell field. The tachyon gives us the opportunity to talk abouttachyon condensation, string field theory, and the search for the true ground state of string theory.
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