Abstract
In this paper we investigate a novel connection between the effective theory of M2-branes on \(({\mathbb {C}}^2/{\mathbb {Z}}_2\times {\mathbb {C}}^2/{\mathbb {Z}}_2)/{\mathbb {Z}}_k\) and the \({\mathfrak {q}}\)-deformed Painlevé equations, by proposing that the grand canonical partition function of the corresponding four-nodes circular quiver \({\mathcal {N}}=4\) Chern–Simons matter theory solves the \({\mathfrak {q}}\)-Painlevé VI equation. We analyse how this describes the moduli space of the topological string on local \(\text {dP}_5\) and, via geometric engineering, five dimensional \(N_f=4\) \(\text {SU}(2)\) \({\mathcal {N}}=1\) gauge theory on a circle. The results we find extend the known relation between ABJM theory, \({\mathfrak {q}}\)-Painlevé \(\text {III}_3\), and topological strings on local \({{\mathbb {P}}}^1\times {{\mathbb {P}}}^1\). From the mathematical viewpoint the quiver Chern–Simons theory provides a conjectural Fredholm determinant realisation of the \({\mathfrak {q}}\)-Painlevé VI \(\tau \)-function. We provide evidence for this proposal by analytic and numerical checks and discuss in detail the successive decoupling limits down to \(N_f=0\), corresponding to \({\mathfrak {q}}\)-Painlevé III\(_3\).
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Notes
Note that this Fredholm determinant is different from the spectral determinant of the auxiliary linear problem associated with the Painlevé equation. See for example [34].
Here we follow the standard terminology already used in [10] (see section 2.1) distinguishing the complex moduli of the mirror curve into a “true” modulus which we call \(\kappa \) and mass parameters.
We could consider more general choices of FI parameters and also introduce hypermultiplet’s masses. However, such extra deformations either do not preserve the Newton polygon of the quantum curve (2.4) or do not affect the quantum curve at all.
There are a couple of notational differences. First, the sign of the Chern–Simons level between an NS5-brane and a \(\left( 1,k\right) \)5-brane in this paper is opposite to that in [23]. Second, according to [23], we should care of the position of the node whose rank is the lowest. In this paper, \(N_{4}\) is always the smallest.
While this draft was in preparation, the quantum mirror curve for general values of \((M_1,M_2,M,\zeta _1,\zeta _2)\) also appeared in [26]. Our formula for the quantum mirror curve is their eq. (A.1) combined with eq. (3.5), where \(m_i^{\left[ \text {FMMN} \right] }\) and \(z_i^{\left[ \text {FMMN} \right] }\) in [26] being related to the rank differences \(M_1,M_2,M\) and the FI parameters \(\zeta _1,\zeta _2\) as
$$\begin{aligned}&m_1^{\left[ \text {FMMN} \right] }=e^{\pi i(-M_1+M_2)},\quad m_2^{\left[ \text {FMMN} \right] }=e^{\pi i(M-k)},\quad m_3^{\left[ \text {FMMN} \right] }=e^{\pi i(M_1+M_2-M-k)}, \end{aligned}$$(3.9)$$\begin{aligned}&z_1^{\left[ \text {FMMN} \right] }=e^{-2\pi \zeta _1},\quad z_3^{\left[ \text {FMMN} \right] }=e^{-2\pi \zeta _2}. \end{aligned}$$(3.10)We thank Prof. Moriyama for pointing it out.
The explicit expressions for \(s_1,s_2,s_3,s_4,s_5\) are written in [23] but in a different basis \(\left( \log \bar{h}_1,\log \bar{h}_2,\log e_1,\log e_3,\log e_5\right) \), which is related to the current basis \(\left( M_1-k,M_2-k,M-k,-i\zeta _1,-i\zeta _2\right) \) as
$$\begin{aligned} \begin{pmatrix} \log \bar{h}_1\\ \log \bar{h}_2\\ \log e_1\\ \log e_3\\ \log e_5\\ \end{pmatrix}=\pi i\begin{pmatrix} 2&{}\quad 0&{}\quad 0&{}\quad 0&{}\quad 0\\ 0&{}\quad 2&{}\quad -2&{}\quad 0&{}\quad 0\\ 1&{}\quad 1&{}\quad -2&{}\quad 2&{}\quad 0\\ 1&{}\quad 1&{}\quad 0&{}\quad 0&{}\quad -2\\ 1&{}\quad 1&{}\quad -2&{}\quad -2&{}\quad 0 \end{pmatrix} \begin{pmatrix} M_1-k\\ M_2-k\\ M-k\\ -i\zeta _1\\ -i\zeta _2 \end{pmatrix}. \end{aligned}$$(3.26).
Explicitly, \({{\widehat{\rho }}}_k\) in (3.7) and \({{\widehat{\rho }}}_k\) in (4.1) are related by the following similarity transformation:
$$\begin{aligned} {{\widehat{\rho }}}_k^{4.1} ={\widehat{U}}{{\widehat{\rho }}}_k^{3.7}{\widehat{U}}^{-1}, \end{aligned}$$(4.2)with
$$\begin{aligned} {{\widehat{U}}}=e^{\left( \frac{1}{2}-\frac{M_2}{2k}\right) {{\widehat{x}}}} \frac{ \Phi _b\left( \frac{{{\widehat{x}}}}{2\pi b}+\frac{\zeta _2}{b}-\frac{iM_2}{2b}+\frac{ib}{2}\right) }{ \Phi _b\left( \frac{{{\widehat{x}}}}{2\pi b}+\frac{\zeta _2}{b}+\frac{iM_2}{2b}-\frac{ib}{2}\right) }. \end{aligned}$$(4.3).
We can also chose \(B_j\left( x\right) \) as any polynomials satisfying
$$\begin{aligned} B_{j+1}\left( x+1\right) -B_{j+1}\left( x\right) =\left( j+1\right) x^j. \end{aligned}$$(4.47).
In terms of the grand partition function, which appears in the right hand side of (3.23), this operation corresponds to rescale \(\kappa \) as \(e^{\pi \zeta _{2}}\kappa \).
Matching the similarity transformation and the shift guarantees the equality between the density matrix and the quantum curve at operator level. We explain this point at the end of this section.
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Acknowledgements
We would like to thank Fabrizio Del Monte, Alba Grassi, Hirotaka Hayashi, Andrew P. Kels, Marcos Mariño, Sanefumi Moriyama, Takahiro Nishinaka and Yasuhiko Yamada for valuable discussions and useful comments. Part of the results was computed by using the high performance computing facilities provided by SISSA (Ulysses) and by Yukawa Institute for Theoretical Physics (Sushiki server). The work of NK is supported by Grant-in-Aid for JSPS Fellows No.20J12263. This research is partially supported by the INFN Research Projects GAST and ST &FI, by PRIN “Geometria delle varietà algebriche” and by PRIN “Non-perturbative Aspects Of Gauge Theories And Strings” and by GNFM of INdAM. Data sharing not applicable to this article as no datasets were generated or analysed during the current study.
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Appendices
A Quantum dilogarithm and other special functions
In the following we assume \(|{\mathfrak {q}}|\ne 1\). We recall the definition of \({\mathfrak {q}}-\)numbers,
and the infinite multiple \({\mathfrak {q}}\)-Pochhammer symbol
This is defined for \(|z|<1\), but can be analytically continued to \(z\in {\mathbb {C}}\) using the latter equality. We extend the definition to an empty symbol \((z;)_\infty :=1-z\). For any \(k\ge 1\) we then have the relations
Let us introduce the \({\mathfrak {q}}\)-Gamma and \({\mathfrak {q}}\)-Barnes G functions
where \(|{\mathfrak {q}}|<1\), which satisfy the \({\mathfrak {q}}\)-analogues of the usual properties of Gamma and Barnes G functions,
and are both equal to one at \(u=1\) and log-convex [80]. These can also be easily analytically continued to \(|{\mathfrak {q}}|>1\) using
Let us finally introduce the quantum dilogarithm function \(\Phi _b\left( z\right) \) as [39]
Note that \(\Phi _b\left( z\right) \) satisfies the following recursive relations
and that its asymptotic behavior is
B Fermi gas formalism
In this appendix, we address the study of the matrix model (3.4) in the Fermi gas formalism. First of all, we introduce our notations for one-dimensional quantum mechanics. We denote the canonical position operators as \({{\widehat{x}}}\) and define the canonical momentum operator \({{\widehat{p}}}\) normalized as \([{{\widehat{x}}},{{\widehat{p}}}]=i\hbar \) with \(\hbar =2\pi k\). We denote a position eigenstate as \(|x\rangle \) and a momentum eigenstate as \(|p\rangle \!\rangle \), which are normalized as
For later purposes, we also introduce a symbol \(t_{\zeta ,n,r}\) defined as
Our goal is to derive the expressions for the matrix model (3.5) and \({{\widehat{\rho }}}_k^{-1}\) (3.11). Our derivation extends the one in [23] to the present case with rank deformations and generic Fayet-Iliopoulos parameters. In the following we assume that the FI parameters \(\zeta _{i}\) are real, we use the parametrization
and assume that N, \(M_{1}\), \(M_{2}\) and M are non-negative integers as in the main text. We also assume \(M_{1}\ge M\) and \(M_{2}\ge M\).
The integrand of the matrix model, after shifting all of the integration variables as \(\mu \rightarrow \frac{\mu }{k}\), can be divided into two parts as
where
We first focus on \(Y_{N_{4},\tilde{N},N_{2}}\) and rewrite it in the operator formalism. By combining the Cauchy determinant formula and the Vandermonde determinant formula [81]
we can rewrite the third line of (B.6) as the determinant of the product of two matrices. The notation for the operator formalism is in (B.1),(B.2). The elements of the matrices can be rewritten in the operator formalism. We will make use of the following identities
where in the second line, as we shifted the integration contour from \({\mathbb {R}}\) to \({\mathbb {R}}+i\pi L\), we obtain a summation over the resulting residues. Fortunately, the contribution to the determinant of the latter vanishes being a linear combination of rows. Indeed it is evident from (B.7),(B.8) that the sum of the residues is a linear combination of the lower (or right) elements.
The third line of \(Y_{N_{4},\tilde{N},N_{2}}\) is now written in the operator formalism. To write all of factors in the operator formalism, we multiply the first matrix by a Fresnel factor \(e^{\frac{i}{4\pi k}\sum _{n=1}^{\bar{N}}\lambda _n^2}\). We also include the first FI factor, depending on \(\zeta \), in the first matrix and the second FI factor, depending on \(\zeta '\), in the second matrix. After performing the similarity transformations
we obtain
where \(\tilde{M}=N_4-\tilde{N}\) and \(t_{\zeta ,n,r}\) is defined in (B.3).
We now return to the matrix model (B.5). Upon the similarity transformation
and by using the formulae
we find that the matrix models can be written as
where
and
\(\tilde{Y}_{N_{4},\tilde{N},N_{2}}\) can be computed as follows. Since the second determinant is an anti-symmetric function of \(\lambda _{m}\), we can simplify the first determinant by using
which holds for any anti-symmetric function \(f\left( \varvec{\lambda }\right) \). We decompose the other determinant by using (B.10),(B.9) and (B.7),(B.8) backwards. Now we can perform the integration by using the delta functions coming form the inner products of the position operators. After a short computation, we obtain
where
is the partition function of \(\textrm{U}\left( L\right) _{k}\) pure Chern–Simons theory. We again use the determinant formula (B.7),(B.8) and the operator formula (B.10),(B.9) for the factor at the third line, and we include the FI factors and the factors in the second line into the matrix. As a result, we obtain
where
By using the recursive formula for the quantum dilogarithm functions (A.8), (B.25) can be written in terms of the quantum dilogarithm as (\(b=\sqrt{k}\))
By substituting (B.24) into (B.17), we finally arrive at
where
Let us perform a short digression on the formulas which can be used to rephrase our final result (B.27) in a more concise way, though we do not use them in the main text. Note that by using the formula
the partition function for \(M>0\) (B.27), which is written as a \(\left( 2N+M\right) \) dimensional integral, can be further reduced to a N dimensional integral:
which implies that the grand partition function (3.2) can be written as [81]
1.1 B.1 \(M=0\) case
When \(M=0\), the matrix model (B.33) simplifies to
where
This is the same as (3.7). For this expression, we can relate the density matrix to the quantum curve [39, 82]. The important relations are
where we used the Baker–Campbell–Hausdorff formula \(e^{\alpha \widehat{x}}e^{\beta \widehat{p}}=e^{2\pi i\alpha \beta k}e^{\beta \widehat{p}}e^{\alpha \widehat{x}}\) and (A.8). By using these relations, we obtain
The inverse of the density matrix is the product of the above two quantum curves. Therefore, we finally obtain
This is the quantum curve associated to the (2,2) model for \(M=0\).
C Proof of (4.7): \({{\widehat{\rho }}}_k\left( M_1,M_2,0,\zeta _1,\zeta _2\right) \sim {{\widehat{\rho }}}_k\left( M_1,M_2,0,\zeta _2,\zeta _1\right) \)
First we notice the following identity
This identity can be proved by calculating the inverse of both sides. The inverse of the left-hand side can be calculated as
By moving \(e^{\pm \frac{{{\widehat{p}}}}{2}}\) to the right by using the formula \(e^{\pm \frac{{{\widehat{p}}}}{2}}f\left( {\widehat{x}}\right) e^{\mp \frac{{{\widehat{p}}}}{2}}=f\left( {{\widehat{x}}}\mp \pi ik\right) \), we are left with ratios of \(\Phi _b\) which can be simplified by the recursive formula (A.8). We finally obtain
In the same way the inverse of the right-hand side of (C.1) can be simplified as
This is identical to the inverse (C.3) of the left-hand side of (C.1).
By using the identity (C.1) we can show (4.7), namely \({{\widehat{\rho }}}_k\left( M_1,M_2,0,\zeta _1,\zeta _2\right) \sim {{\widehat{\rho }}}_k\left( M_1,M_2,0,\zeta _2,\zeta _1\right) \), as follows. First we reorder the terms in \({{\widehat{\rho }}}\) (4.1) cyclically
Now to each line we can apply the identity (C.1). After combining the exponential factors together and cyclically reordering the terms, we obtain
The last expression coincides with \({{\widehat{\rho }}}\) (4.1) with the replacement \(\left( \zeta _1,\zeta _2,{{\widehat{x}}},{{\widehat{p}}}\right) \rightarrow \left( \zeta _2,\zeta _1,{{\widehat{p}}},-{{\widehat{x}}}\right) \). Since the change of variables in \({{\widehat{x}}},{{\widehat{p}}}\) is a canonical transformation, which can be realized by a similarity transformation, we conclude that \({{\widehat{\rho }}}_k\left( M_1,M_2,0,\zeta _2,\zeta _1\right) \sim {{\widehat{\rho }}}_k\left( M_1,M_2,0,\zeta _1,\zeta _2\right) \).
D Weyl transformations
We give the list of \(2\cdot 4!\) Weyl transformations discussed in section in terms of the generators, realized also as matrices, arranged by length. A positive integer \(i_1...i_k\) represents the product \(s_{i_1}\ldots s_{i_k}\):
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Bonelli, G., Globlek, F., Kubo, N. et al. M2-branes and \({\mathfrak {q}}\)-Painlevé equations. Lett Math Phys 112, 109 (2022). https://doi.org/10.1007/s11005-022-01597-0
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DOI: https://doi.org/10.1007/s11005-022-01597-0
Keywords
- Discrete integrable systems
- Supersymmetric gauge
- Topological string theory
- Chern-Simons theory
- Matrix model