Tateo's dilogarithm identities for RSG/SG Y-systems

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Let L(x)L(x) be the Rogers dilogarithm, let YRSG/SG(n1,…,nF)\mathbb{Y}_{\mathrm{RSG/SG}}(n_1,\dots,n_F) be the RSG/SG YY-system, and let I+:={(a,m,u)∣Ym(a)(u)∈Y+}\mathcal{I}_+:=\{(a,m,u)\mid Y^{(a)}_m(u)\in\mathcal{Y}_+\}. For a real positive solution, with rr and the parameters pa,qap_a,q_a as defined for the RSG/SG systems, the following identities are conjectured for the variables in I+\mathcal{I}_+:

Tateo's dilogarithm identities.

6π2∑(a,m,u)∈I+0≤u<2rL(11+Ym(a)(u))=M+,\frac{6}{\pi^2}\sum_{(a,m,u)\in\mathcal{I}_+\atop 0\leq u<2r}L\left(\frac{1}{1+Y^{(a)}_m(u)}\right)=M_+, 6π2∑(a,m,u)∈I+0≤u<2rL(Ym(a)(u)1+Ym(a)(u))=M−.\frac{6}{\pi^2}\sum_{(a,m,u)\in\mathcal{I}_+\atop 0\leq u<2r}L\left(\frac{Y^{(a)}_m(u)}{1+Y^{(a)}_m(u)}\right)=M_-.

For the RSG case,

M+=r(−6AF+∑a:evenna+2),M−=r(6AF+∑a:oddna−4),M_+=r\left(-6A_F+\sum_{a:\mathrm{even}}n_a+2\right),\qquad M_-=r\left(6A_F+\sum_{a:\mathrm{odd}}n_a-4\right), AF=∑a=1F−1(−1)a+11paqa+(−1)F+11pFr.A_F=\sum_{a=1}^{F-1}(-1)^{a+1}\frac{1}{p_aq_a}+(-1)^{F+1}\frac{1}{p_Fr}.

For the SG case,

M+=r(∑a:evenna+1),M−=r(∑a:oddna),M_+=r\left(\sum_{a:\mathrm{even}}n_a+1\right),\qquad M_-=r\left(\sum_{a:\mathrm{odd}}n_a\right),

with the summation in the SG formulas running over 1≤a≤F1\leq a\leq F. These identities are the second main result proved in the paper, so the conjecture is solved by the stated results. They give explicit Rogers-dilogarithm sums for positive solutions of the RSG/SG YY-systems, extending the identities conjectured by Tateo.

References

Primary source

Tomoki Nakanishi and Salvatore Stella, “Wonder of sine-Gordon Y-systems”, arXiv:1212.6853 (2016).

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