Ghost Structure and Closed Strings in Vacuum String Field Theory

@article{Gaiotto2001GhostSA,
  title={Ghost Structure and Closed Strings in Vacuum String Field Theory},
  author={Davide Gaiotto and Leonardo Rastelli and Ashoke Sen and Barton Zwiebach},
  journal={Advances in Theoretical and Mathematical Physics},
  year={2001},
  volume={6},
  pages={403-456}
}
We complete the construction of vacuum string field theory by proposing a canonical choice of ghost kinetic term – a local insertion of the ghost field at the string midpoint with an infinite normalization. This choice, supported by level expansion studies in the Siegel gauge, 

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