The kernel of the modular representation and the Galois action in RCFT

Details The kernel of the modular representation and the Galois action in RCFT The kernel of the modular representation and the Galois action in RCFT

2001-02-19

arxiv.org/abs/math/0102149v2

Commun.Math.Phys. 233 (2003) 423-438

Mathematics

Quantum Algebra

Scientific paper

10.1007/s00220-002-0760-x

It is shown that for the modular representations associated to Rational Conformal Field Theories, the kernel is a congruence subgroup whose level equals the order of the Dehn-twist. An explicit algebraic characterization of the kernel is given. It is also shown that the conductor, i.e. the order of the Dehn-twist is bounded by a function of the number of primary fields, allowing for a systematic enumeration of the modular representations coming from RCFTs. Restrictions on the spectrum of the Dehn-twist and arithmetic properties of modular matrix elements are presented.

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