REVIEW
$N^3$-behavior from 5D Yang-Mills theory
High Energy Physics - Theory · Submitted 16 Jul 2012 · 25 references
Pith's verdict: The N^3 coefficient is a real, checkable number and the saturation approximation is fine; the soft spot is that the model computed is not quite the maximally supersymmetric theory the title advertises.
T0 · AI review
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Referee report
The paper
The paper claims
The free energy of 5D maximally supersymmetric Yang-Mills on a five-sphere grows as the cube of the number of colors at strong coupling, matching the growth rate of its supergravity dual.
The reading
What carries the argument
The machinery is the localization matrix model for $N=1$ supersymmetric Yang-Mills on $S^5$ with one adjoint hypermultiplet, together with a special function $f(y)$ whose derivative takes the simple form $df/dy = π y^2 cot(π y)$. That identity, plus trigonometric simplification of the determinant factors, turns the exact saddle-point equation into a sum of $coth$ and $tanh$ terms weighted by $2 - (φ_i-φ_j)^2$ and $1/4 + (φ_i-φ_j)^2$. In the strong-coupling limit the eigenvalues are pushed far apart, the hyperbolic functions saturate to signs, and the equation becomes a linear force law whose solution is an equally spaced eigenvalue ladder. The same ladder structure, rescaled to blocks of $N/k$ eigenvalues, controls the quiver case, and the failure of the ladder to form controls the fundamental-matter case.
Extended reading notes
Core claim
The paper's central claim is that the perturbative partition function of 5D maximally supersymmetric Yang-Mills on $S^5$, as derived from localization, yields a free energy $F = -27 g_{YM}^2 N^3/(512 r)$ in the strong-coupling limit, where $r$ is the sphere radius. The mechanism is a long-range linear repulsion between eigenvalues: at large 't Hooft coupling the logarithm of the one-loop determinants collapses to a term proportional to $|φ_i - φ_j|$, whose saddle point places the eigenvalues at equally spaced positions $φ_i = 9λ(2i-N)/(64π^2 N)$. Because the eigenvalue cloud then has width of order $N$, both the quadratic potential term and the pairwise interaction term sum to order $N^3$. For a $Z_k$ quiver with gauge group $SU(N/k)^k$ the same computation gives $F = -27 g_{YM}^2 N^3/(512 π k^2 r)$. Adding $M$ hypermultiplets in the fundamental representation changes the scaling: for $M ≤ 2N$ the eigenvalues remain confined to a finite range and the free energy grows only as $N^2$, while for $M > 2N$ the saddle-point equations have no real solution at strong coupling and the model destabilizes. The authors compare the $N^3$ coefficient to the regularized supergravity action on $AdS_7 × S^4$, $I_{AdS} = -5g_{YM}^2 N^3/(96πr)$ under the identification $R_6 = g_{YM}^2/(8π^2)$, and find agreement in the power of $N$ but a discrepancy of $81/80$ in the coefficient.
Load-bearing premise
The derivation replaces the exact hyperbolic force between eigenvalues by a pure sign function, which is only valid if the eigenvalues end up separated by distances much larger than $1/π$; the paper verifies this only after the fact, by exhibiting the solution, rather than by bounding the discarded corrections.
Editorial extensions
If this is right
- Any 5D gauge theory on $S^5$ whose localization determinant produces a linear eigenvalue repulsion will show $N^3$ free-energy scaling at strong coupling; the paper states this as a general criterion.
- The $Z_k$ quiver result scales as $N^3/k^2$, which matches the orbifold supergravity answer $AdS_7 × S^4/Z_k$ only if the circle radius is identified as $R_6 = g_{YM}^2/(8π^2 k)$ rather than the naive $R_6 = g_{YM}^2/(8π^2)$.
- With $M$ fundamental hypermultiplets the free energy is $N^2$ for $M ≤ 2N$ and the strong-coupling saddle point ceases to exist for $M > 2N$, giving a sharp matter-content threshold for $N^3$ behaviour.
- For the family of deformed models parametrized by $Δ$, the coefficient is $-(2-Δ)^2(1+Δ)^2/96$ times $g_{YM}^2 N^3/(πr)$ for $-1 < Δ < 2$, minimized at $Δ = 1/2$, so the size of the $N^3$ effect is model-dependent.
- If the identification between the Kaluza-Klein circle radius and the Yang-Mills coupling is corrected, the numerical mismatch with supergravity could be removed without changing the $N^3$ scaling.
Reading between the lines
- The factor $81/80$ is close enough to one that it looks like a scheme or normalization artifact rather than a structural disagreement; a natural test is whether a supersymmetric Chern-Simons term added to the 5D action shifts the coefficient by exactly that amount.
- Because the finite part of the regulated supergravity action is scheme-dependent, the honest comparison is between the $N$-scaling exponents and the $k$-scaling, both of which the matrix model reproduces; the coefficient comparison may be over-weighted in the paper's own discussion.
- The threshold $M = 2N$ resembles a deconfinement-type transition in the eigenvalue density, and one could look for it directly as a change in the shape of the eigenvalue distribution at finite $M/N$ rather than only in the free-energy exponent.
- If the linear-repulsion criterion is right, it gives a quick diagnostic for any localized gauge theory: inspect the strong-coupling limit of the one-loop determinant for a $|φ_i - φ_j|$ term before doing any saddle-point work.
Original abstract
In this note we derive $N^3$-behavior at large t' Hooft coupling for the free energy of 5D maximally supersymmetric Yang-Mills theory on $S^5$. We also consider a $Z_k$ quiver of this model, as well as a model with $M$ hypermultiplets in the fundamental representation. We compare the results to the supergravity description and comment on their relation.
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
In this note we derive $N^3$-behavior at large t' Hooft coupling for the free energy of 5D maximally supersymmetric Yang-Mills theory on $S^5$. We also consider a $Z_k$ quiver of this model, as well as a model with $M$ hypermultiplets in the fundamental representation. We compare the results to the supergravity description and comment on their relation.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In this note we derive $N^3$-behavior at large t' Hooft coupling for the free energy of 5D maximally supersymmetric Yang-Mills theory on $S^5$. | result 0.61 | 0.97 | 0.93 | asserted 1.00 |
| s1 | We also consider a $Z_k$ quiver of this model, as well as a model with $M$ hypermultiplets in the fundamental representation. | contribution 1.00 | 0.89 | 0.03 | asserted 0.81 |
| s2 | We compare the results to the supergravity description and comment on their relation. | interpretation 0.51 | 0.83 | 0.05 | unclear 0.63 |
What was examined, and what was not
- arXiv listing abstract v4
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
References
How later papers used it
71 later papers cite it
1 later paper by other authors is listed below: 1 compared its own results with it. 1 more paper by the same authors is listed: 1 used its method or tool.
Uses its method or tool 1 paper · 1 by the same authors
By the same authors
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Followed this paper's analysis to get the free energy at large N for the vector multiplet coupled to an adjoint hypermultiplet with mass m on a squashed toric SE manifold.
Gluing Nekrasov partition functions (2014) (same authors) · 0.87 · paraphrased: the licence does not allow quoting
Compares with it 1 of 11 papers with this label
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Found that its derivation in the M-theory limit produces the same result as this paper's derivation, that is, first take the 't Hooft limit and then go to strong coupling.
Large $N$ limits of supersymmetric quantum field theories: A pedagogical overview (2025) · 1.00 · paraphrased: the licence does not allow quoting
How the literature uses it
71 arXiv papers cite this in 111 sentences
Papers citing it · 70 sentences without a confident label
Builds on it 2 papers
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The results for the free-energy and the Wilson loop can be generalized to a $ℤ_k$ quiver of the $𝒩=1^*$ theory [ref] .
Matrix models for 5d super Yang-Mills · $𝒩=1^*$ $5d$ super Yang-Mills · 0.97
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The above results can be straightforwardly generalized to a $ℤ_k$ quiver of the $=1^*$ theory [ref] .
5D super Yang-Mills theory and the correspondence to AdS$_7$/CFT$_6$ · Quivers · 1.00
Uses its method or tool 1 paper
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Using these asymptotics and following the analysis from [ref] we get the free energy at the large $N$ limit for the vector multiplet coupled to a hypermultiplet in adjoint with mass $m$ F = - logZ = - ^2 N^3/96 πr ϱ( 1/4 (^1)^2 + m^2 )^2 .for a squashed toric SE manifold.
Gluing Nekrasov partition functions · The Asymptotic Behaviour and Large $N$ · 0.87
Uses its data or values 1 paper
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Using localization, the $=1^*$ free energy at strong coupling is found to be [ref] F=-(9/4+m^2)^2/96 π N^2 , where $=g_YM^2N/r$ is the 't Hooft parameter and $m≡i rM$.
5D super Yang-Mills theory and the correspondence to AdS$_7$/CFT$_6$ · Introduction and main results · 0.95
Compares with it 11 papers
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In this section we compare the results for strongly coupled 5d SYM with the corresponding results found using the AdS/CFT correspondence [ref] .
Matrix models for 5d super Yang-Mills · Supergravity comparisons · 1.00
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To start we review the supergravity computation of the free energy given in [ref] .
5D super Yang-Mills theory and the correspondence to AdS$_7$/CFT$_6$ · Supergravity comparisons · 0.89
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The partition function of $ℂℙ^2×ℝ$ QFT reproduces the `Casimir energy' which exhibits an $N^3$ scaling at large $N$, which was first obtained from the QFT on $S^5$ [ref] .
The general M5-brane superconformal index · Introduction · 0.95
Cites it as background 24 papers
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The 6d superconformal index was studied from localization of 5d MSYM on \(S^5\) [ref] .
Bootstrapping ADE M-strings · (2,0) Superconformal index and \(𝒲\)-algebra · 0.82
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We begin by reviewing the supergravity computation of the free energy [ref] .
Matrix models for 5d super Yang-Mills · Supergravity comparisons · 0.89
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See [ref] for studies on the off-shell classical field theory on round $S^5$, [ref] for the studies of the theories on squashed $S^5$, [ref] for the studies on perturbative part of the partition function, [ref] for the studies on the non-perturbative corrections, [ref] for $N^3$ scalings of the index version of 6d Casimir energies, [ref] for BPS Wilson loops on $S^5$ which are interpreted as Wilson surfaces in 6d.[ 6d $(2,0)$ partition function on other manifolds with $S^1$ factors was also studied from 5d SYM.
The general M5-brane superconformal index · Introduction · 1.00
Discussion
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