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arXiv 1607.08516hep-thmath-phmath.MP
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具有整数能级的非手性2d CFT

Non-chiral 2d CFT with integer energy levels

M. Ashrafi, F. Loran

摘要:

二维共形场论的配分函数是模不变函数。已知中心荷为24的倍数的全纯CFT的配分函数是Klein函数的多项式。本文利用中温展开式证明了每一个模不变配分函数都可以映射到一个全纯的配分函数,其结构可以类似地确定。利用该映射研究了半整数左右共形权函数的CFT的配分函数。我们证明了相应的左右中心荷必然是4的倍数。此外,高能级的简并度可以根据低能态的简并度唯一地确定。

英文摘要:

The partition function of 2d conformal field theory is a modular invariant function. It is known that the partition function of a holomorphic CFT whose central charge is a multiple of 24 is a polynomial in the Klein function. In this paper, by using the medium temperature expansion we show that every modular invariant partition function can be mapped to a holomorphic partition function whose structure can be determined similarly. We use this map to study partition function of CFTs with half-integer left and right conformal weights. We show that the corresponding left and right central charges are necessarily multiples of 4. Furthermore, the degree of degeneracy of high-energy levels can be uniquely determined in terms of the degeneracy in the low energy states.

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