In the highest-weight representation, the Carroll-Weyl null string is anomalous for every target-space dimension because its three anomaly coefficients demand D=27, D=6, and D=4 simultaneously.
Tensionless branes and the null string critical dimension
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abstract
BRST quantization is carried out for a model of p-branes with second class constraints. After extension of the phase space the constraint algebra coincides with the one of null string when p=1. It is shown that in this case one can or can not obtain critical dimension for the null string, depending on the choice of the operator ordering and corresponding vacuum states. When p>1, operator orderings leading to critical dimension in the p=1 case are not allowed. Admissable orderings give no restrictions on the dimension of the embedding space-time. Finally, a generalization to supersymmetric null branes is proposed.
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BRST quantization of Carroll-Weyl gauged null strings
In the highest-weight representation, the Carroll-Weyl null string is anomalous for every target-space dimension because its three anomaly coefficients demand D=27, D=6, and D=4 simultaneously.