REVIEW
Five-loop Konishi from the Mirror TBA
High Energy Physics - Theory · Submitted 9 Feb 2010 · 41 references
Pith's verdict: A careful, honest consistency check of the mirror TBA at five loops — the number is borrowed, the TBA-side machinery is the contribution, and the abstract oversells the precision slightly.
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Referee report
The paper
The paper claims
The mirror thermodynamic Bethe ansatz, linearized around the Konishi state, reproduces the five-loop correction to the asymptotic Bethe equations obtained independently from generalized Lüscher formulae, term by term in the auxiliary $Y$-fu
The reading
What carries the argument
The load-bearing object is the linearized TBA kernel $Omega_{QM}(u,v) = delta_{QM} delta(u-v) - delta_{Q,M-1} A_{M-1|vw}(u) s(u-v) - delta_{Q,M+1} A_{M+1|vw}(u) s(u-v)$, with $A_{M|vw} = Y^o_{M|vw}/(1+Y^o_{M|vw})$ taking the explicit rational form given in the text and $s(u) = 1/(4 cosh(pi u/2))$. Inverting or iterating this kernel converts the known asymptotic $Y^o_{M+1}$ into the correction $Y_{M|vw}$, and only $Y_{1|vw}$ is needed because the exact Bethe equation in the representation used here contains no $Y_{M|w}$ at all and only $Y_{1|vw}$ from the $M|vw$ tower. The second piece of machinery is the exact Bethe equation itself, quoted from the authors' earlier hybrid-TBA derivation, whose imaginary part is written as $pi(2n_k+1) = J p_k + i sum_j log S^{sl(2)}_{1*1*}(u_j,u_k) + R_k$; the statement that $R_k$ vanishes asymptotically for any $g$ is what allows the shift from the asymptotic rapidities to be discarded, leaving $R_k$ alone as the object to compare.
Extended reading notes
Core claim
The authors linearize the simplified mirror TBA equations around the large-$J$ asymptotic solution, writing each $Y$-function as $Y^o(1+Y)$, and then expand further in the coupling with $J$ fixed to 2 (the Konishi value). They show that at order $g^8$ only the $M|vw$-string functions survive: the $M|w$-strings and the $y$-particle combinations enter at $g^{10}$ or higher, and the $Q$-particle equations would only correct $Y^o_Q$ at $g^{16}$. The surviving linear system, $Y_{M|vw} = (A_{M-1|vw}Y_{M-1|vw} + A_{M+1|vw}Y_{M+1|vw}) * s - Y^o_{M+1} * s$, is solved numerically by iterating an inhomogeneous version, and the resulting $Y_{1|vw}$ is inserted into the exact Bethe equation in the representation of the authors' earlier work. In this way they obtain the order-$g^8$ shift $R_k$ as an explicit sum of convolutions of the asymptotic $Y^o_M$ with known kernels plus a term built from $A_{1|vw}Y_{1|vw}$. Comparing with the Lüscher-side quantity $(8)$ of the earlier five-loop paper, they find that the individual contributions attached to each $Y^o_M$ agree numerically, with absolute differences of order $10^{-8}$ to $10^{-10}$ for $M = 2$ through $6$ and relative differences from about $5$ x $10^{-6}$ at $M=2$ growing to about $10^{-2}$ at $M=6$, the degradation attributed to the smallness of the higher-$M$ contributions. The paper closes with an observation: the Lüscher expression can be rewritten as $-sum_M int du, partial_w Y^o_M(u)/(4)$, a derivative of the transfer matrix with the level-matching condition imposed first, resembling a known result in the $O(4)$ model, whereas the generalized Lüscher formula involves the trace of the derivative of the $S$-matrix with respect to the mirror rapidity; the two coincide here but the authors state they must be distinguished in general.
Load-bearing premise
The numerical iteration that produces $Y_{1|vw}$ is assumed to converge to the unique solution of the linearized equation, which the authors state requires the homogeneous equation to admit only the trivial solution; if that failed, the extracted correction would be ambiguous and the comparison with the Lüscher result would not be well defined.
Editorial extensions
If this is right
- The five-loop Konishi anomalous dimension quoted from the Lüscher computation, including its $g^{10}$ coefficients in $zeta(3)^2$, $zeta(3)$, $zeta(5)$, $zeta(7)$ and a rational term, gains independent support from the TBA side.
- Because auxiliary $Y_{M|vw}$ functions first contribute at order $g^8$, any weak-coupling treatment of wrapping that keeps only the main $Y_Q$'s will miss the five-loop correction; the coupled system cannot be truncated at that order.
- The correction can be recast as a transfer-matrix derivative, $-sum_M int du, partial_w Y^o_M(u)/(4)$, giving a compact form for the finite-size shift that parallels a known result in the $O(4)$ model.
- The same machinery extends to other twist-two operators, so the reciprocity and BFKL constraints imposed on the five-loop twist-two dimensions become checkable against the TBA at the same order.
Reading between the lines
- If the numerical match can be promoted to an analytic identity, the TBA and the Lüscher resummation would be two computations of one and the same quantity, and the auxiliary $Y$-system would be the natural bookkeeping device for wrapping corrections at all orders rather than only the first few.
- The distinction the authors flag between the transfer-matrix derivative and the trace of the $S$-matrix derivative is a live fork: for states other than Konishi the two prescriptions should give different answers, which would be a sharp and cheap discriminator between candidate all-order formulae.
- A direct five-loop field-theory computation of the Konishi anomalous dimension, once available, would be the arbiter if the two methods ever disagreed; the present agreement is a consistency check between two approximations of the same integrable structure, not an external measurement.
- The precision loss at higher $M$ is a numerical artifact of small contributions, but it also hints that a resummed treatment of the $M$ tower would be more informative than a term-by-term comparison.
Original abstract
We use the Thermodynamic Bethe Ansatz equations for the AdS_5 \times S^5 mirror model to derive the five-loop anomalous dimension of the Konishi operator. We show numerically that the corresponding result perfectly agrees with the one recently obtained via the generalized Luscher formulae. This constitutes an important test of the AdS/CFT TBA system.
The compiled record
The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
The abstract, sentence by sentence
We use the Thermodynamic Bethe Ansatz equations for the AdS_5 \times S^5 mirror model to derive the five-loop anomalous dimension of the Konishi operator. We show numerically that the corresponding result perfectly agrees with the one recently obtained via the generalized Luscher formulae. This constitutes an important test of the AdS/CFT TBA system.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We use the Thermodynamic Bethe Ansatz equations for the AdS_5 \times S^5 mirror model to derive the five-loop anomalous dimension of the Konishi operator. | contribution 0.70 | 0.96 | 0.49 | asserted 1.00 |
| s1 | We show numerically that the corresponding result perfectly agrees with the one recently obtained via the generalized Luscher formulae. | result 0.99 | 0.93 | 0.27 | asserted 1.00 |
| s2 | This constitutes an important test of the AdS/CFT TBA system. | interpretation 1.00 | 0.47 | 0.37 | asserted 1.00 |
What was examined, and what was not
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- P abstract
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Figures
Figures reproduced from arXiv:1002.1711 by the authors.
References
How later papers used it
54 later papers cite it
1 paper by the same authors is listed below: 1 used its method or tool.
Uses its method or tool 1 of 3 papers with this label · 1 by the same authors
By the same authors
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Followed the same strategy as this paper by employing the exact Bethe equations in their hybrid form.
Twisting the Mirror TBA (2010) (same authors) · 0.98 · paraphrased: the licence does not allow quoting
How the literature uses it
54 arXiv papers cite this in 84 sentences
Papers whose main result relates to this one's
States the same result 2 papers
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Using the linearized TBA equations recently obtained in [arXiv:1002.1711] we show analytically that the 5-loop anomalous dimension of the Konishi operator agrees with the result obtained previously from the generalized Luscher formulae.
5-loop Konishi from linearized TBA and the XXX magnet · 0.96
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We obtain an analytic result at five loops in the planar limit and observe perfect agreement with the prediction based on integrability in AdS/CFT.
Five-loop Konishi in N=4 SYM · 0.85
Papers citing it · 66 sentences without a confident label
Contests it 1 paper
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This will be given by the solution of the following linearized set of TBA equations: [We note that in [ref] there is an erroneous term in Eq. (2.7): $-Y^0_Q⋆s$ should be instead $-Y^0_Q⋆K_Q$, as in ([ref]).] [equation] where [equation]
TBA, NLO Luscher correction, and double wrapping in twisted AdS/CFT · NLO expansion · contest 0.90
Builds on it 1 paper
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The analysis in [ref] was then extended to prove the agreement analytically first for the Konishi operator [ref] , and then for an arbitrary twist-two operator [ref] reproducing the results in [ref] .[The five-loop computations in [ref] were based on [ref] where the four-loop anomalous dimension of the Konishi operator was computed and shown to agree with the direct field theory result [ref] .
Konishi operator at intermediate coupling · Introduction · 0.84
Uses its method or tool 3 papers
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[ref] and the coefficient functions $D_m(u)$ are the inverses of the functions $A_m|vw(u)$ given by ([ref]).
5-loop Konishi from linearized TBA and the XXX magnet · Linearized TBA equations · 0.94
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Rescaling the variables $u→u/g$, $u_k→u_k/g$, $r̂^(m)_j→ξ_m;j/g$ and $δr^(m)_j→δξ_m;j/g$ and making similar considerations as in [ref] and [ref] it can be shown that the Bethe equations ([ref]) up to $O(g^8)$ can be expressed by the leading $O(g^8)$ expressions of the $Y^o_Q$ functions and with the solution of a linear problem coming from ([ref]).
The Bajnok-Janik formula and wrapping corrections · The Bajnok-Janik formula · 0.93
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Following the same strategy as employed in [ref] , we employ the exact Bethe equations in their hybrid form ([ref]).
Twisting the Mirror TBA · Quantization of momentum and exact Bethe equation · 0.98
Compares with it 5 papers
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In this manner, we obtain an analytic result for the Konishi anomalous dimension at five loops in planar $𝒩=4$ SYM theory and observe perfect agreement with the prediction based on integrability in AdS/CFT [ref] .
Five-loop Konishi in N=4 SYM · Introduction · 0.97
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Our computations check the complete (both horizontal and vertical parts of the) $Y$-system, and go beyond the five-loop calculations presented in [ref] , which checked at the single wrapping order only the vertical part.
TBA, NLO Luscher correction, and double wrapping in twisted AdS/CFT · Conclusion · 0.83
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The task is much more complicated than in the case of the Konishi operator [ref] because in ([ref]) the correction $δr_0$ appears explicitly, together with $𝒴_1|vw$.
Exceptional Operators in N=4 super Yang-Mills · Cancellation of the most $ϕ$-divergent terms · 0.91
Cites it as support 1 paper
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Even more impressively, it lead to correct predictions for the dimension of the Konishi operator both at large [ref] and at small [ref] 't Hooft coupling.
First-principles derivation of the AdS/CFT Y-systems · Introduction · 0.96
Cites it as background 3 papers
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These equations were proposed in [ref] , following the discovery of the Y-system [ref] , and passed a number of important checks [ref] .
Solving the AdS/CFT Y-system · Equivalence of FiNLIE to the TBA equations · 0.97
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On the other hand, the Thermodynamic Bethe Ansatz based on the mirror theory [ref] was advanced as a tool to capture the exact string spectrum in both the 't Hooft coupling constant $λ$ and the size $L$ of the system [ref] .
On Yangian and Long Representations of the Centrally Extended su(2|2) Superalgebra · Introduction · 0.83
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In the result of such investigations the set of TBA equations and the Y-system were formulated [ref] .
Twist-2 at five loops: Wrapping corrections without wrapping computations · Introduction · 0.84
What it cites · 29 sentences without a confident label
Uses the method or tool of 4 papers
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We exploit here the exact Bethe equations in a different representation which is derived from the hybrid TBA equation for $Y_1$ discussed in [ref] . ] admit the following representation π(2n_k+1) = L p_k +i∑_j=1^N logS_(2)^1_*1_*(u_j,u_k) +Im U ExactBAEIm - 2∑_M=1^∞log(1+Y_M )⋆( Im K^Σ_M1_* - s⋆Im K_vwx^M-1,1_* ) + 2 log(1+Y_1|vw)⋆(Im s̃-i s ⋆̂ K^y1_*) - 2log1-Y_-1-Y_+s⋆Im K^11_*_vwx -ilog(1- 1/Y_-)(1- 1/Y_+) K^y1_* .
Exploring the mirror TBA · Correction to the asymptotic Bethe equations · 0.89
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In what follows it is convenient to use the simplified TBA equations derived in [ref] .
Thermodynamic Bethe Ansatz for the AdS_5 x S^5 Mirror Model · Linearizing the TBA system · 0.99
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In what follows it is convenient to use the simplified TBA equations derived in [ref] .
Simplified TBA equations of the AdS_5 x S^5 mirror model · Linearizing the TBA system · 0.99
Uses data or values from 1 paper
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According to [ref] , the quantity $Φ^(8)$ was found to be Φ^(8)(u_k)=∑_M=1^∞∫_-∞^∞du Y_M^o(u)× ×1/π[ -u-u_k/(M+1)^2+(u-u_k)^2-u-u_k/(M-1)^2+(u-u_k)^2+u_k/-1+M^2+u^2-u_k^2] .
Five loop Konishi from AdS/CFT · Correction to the asymptotic Bethe equations · 0.87
Compares with 2 papers
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Then, using this result for $Y_1|vw$ we evaluate numerically the correction to the exact Bethe equations and find that it agrees with $Φ^(8)$ of [ref] with a sufficiently high precision.
Five loop Konishi from AdS/CFT · Introduction · 0.97
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The right hand side involves the derivative of the transfer matrix, and looks similar to the known result for the $O(4)$ model [ref] .
Finite Volume Spectrum of 2D Field Theories from Hirota Dynamics · Correction to the asymptotic Bethe equations · 0.87
Cites as background 4 papers
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Recently there has been interesting progress on its precise formulation and in deriving some consequences of the corresponding spectral equations [ref] - [ref] .
String hypothesis for the AdS_5 x S^5 mirror · Introduction · 0.98
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Recently there has been interesting progress on its precise formulation and in deriving some consequences of the corresponding spectral equations [ref] - [ref] .
Exploring the mirror TBA · Introduction · 0.98
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The mirror Thermodynamic Bethe Ansatz (TBA) is generalization of the relativistic TBA [ref] and offers a tool to determine the spectrum of the $$ superstring [ref] .
On String S-matrix, Bound States and TBA · Introduction · 0.96
Discussion
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