Notes on Ding-Iohara algebra and AGT conjecture (可積分系数理の多様性--RIMS研究集会報告集)
Notes on Ding-Iohara algebra and AGT conjecture (可積分系数理の多様性--RIMS研究集会報告集)
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发表时间:
2011-06
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通讯作者:
粟田 英資;Boris Feigin;星野 歩;金井 政宏;白石 潤一;柳田 伸太郎
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作者:
粟田 英資;Boris Feigin;星野 歩;金井 政宏;白石 潤一;柳田 伸太郎
We study the representation theory of the Ding-Iohara algebra $\calU$ to find $q$-analogues of the Alday-Gaiotto-Tachikawa (AGT) relations. We introduce the endomorphism $T(u,v)$ of the Ding-Iohara algebra, having two parameters $u$ and $v$. We define the vertex operator $\Phi(w)$ by specifying the permutation relations with the Ding-Iohara generators $x^\pm(z)$ and $\psi^\pm(z)$ in terms of $T(u,v)$. For the level one representation, all the matrix elements of the vertex operators with respect to the Macdonald polynomials are factorized and written in terms of the Nekrasov factors for the $K$-theoretic partition functions as in the AGT relations. For higher levels $m=2,3,...$, we present some conjectures, which imply the existence of the $q$-analogues of the AGT relations.