@article{ce423fbc287c49b5bfcfeac7a8e2b469,
title = "Modular invariants from simple currents. An explicit proof",
abstract = "In a previous paper an orbifold construction was used to demonstrate that the existence of primary fields with simple fusion rules in a conformal field theory implies the existence of non-diagonal modular invariant partition functions. Here we present a direct and explicit proof of modular invariance, which also covers a few cases that could not be obtained with the orbifold method. We also give a very simple general formula for the modular matrix M.",
author = "Schellekens, {A. N.} and S. Yankielowicz",
note = "Funding Information: Work supported in part by the US-Israel Binational Science Foundation, and the Israel Academy of Science. Permanent address: School of Physics and Astronomy, Raymond and Beverley Sacler Faculty of Exact Sciences, TeI-Aviv University, Tel-Aviv, Israel.",
year = "1989",
month = aug,
day = "31",
doi = "10.1016/0370-2693(89)90948-9",
language = "אנגלית",
volume = "227",
pages = "387--391",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier",
number = "3-4",
}