\alpha '}}} . I 0 {\displaystyle I_{0}} has diffeomorphism and Weyl invariance. Weylsymmetry is broken upon quantization (Conformal anomaly) and therefore
Springer-Verlag. Hermann Weyl (1952). Symmetry. Princeton University Press. ISBN 0-691-02374-3. Hahn, Werner (1998). Symmetry As A Developmental Principle
Hasan, M.Z.; Prasad, R.; Bansil, A. Topological electronic structure and Weyl semimetal in the TlBiSe2 class. Physical Review B. 2012-09-18, 86 (11): 115208