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Abstract:
The geometric quantization for bosonic strings is discussed in this paper.Relations among different polarizations and representations of operators in different polarizations are given.It is pointed out that the prequantization Hilbert space is the unitary representation of the conformal group where the centre term of Virasoro algebra does not exist but this representation is reducible.By polarization it is reduced into two projective representations with the phase factors with opposite signs.Then the conformal anomaly is obtained.In the viewpoint of geometric quantization,the emergence of the conformal anomaly stems from the fact that polarization is introduced because the quantum states of string must satisfy the uncertainty relation but all generators of conformal transformation don't preserve the same polarization.
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