REVIEW
Enveloping algebra valued gauge transformations for non-abelian gauge groups on non-commutative spaces
High Energy Physics - Theory · Submitted 30 Jun 2000 · 18 references
Pith's verdict: The first-order non-abelian Seiberg-Witten construction is explicit and correct; the abstract's finite-field-content claim is only established to first order in theta, with the all-orders step delegated to a paper listed as in preparation.
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Referee report
The paper
The paper claims
Noncommutative gauge theory can be rewritten with only the ordinary number of gauge fields, because every higher algebraic component is fixed by the Seiberg-Witten map.
The reading
What carries the argument
The load-bearing device is a single star product on one big algebra whose generators are the noncommutative coordinates together with the Lie algebra generators, so that $[abstract:s0]$ the space and the internal symmetry are treated on the same footing. Gauge fields enter as covariant coordinates $[abstract:s0]$, whose transformation law forces the connection to be enveloping-algebra-valued. The Seiberg-Witten map is then the mechanism that ties every higher power of the generators to the Lie-algebra data, and the crucial structural assumption is the grading: the term of order $[abstract:s0]$ in the noncommutativity parameter is taken to be a polynomial of degree $n$ in the generators, which is what makes the two expansions line up order by order. Because higher generator powers correspond to higher powers of the structure constants, this is simultaneously an expansion in the gauge coupling. The paper also shows that for the canonical structure the derivatives need not be introduced separately, since $[abstract:s0]$ commutes with all coordinates and can be set to zero, and that an integral with the cyclic and Stokes properties exists, which is what allows a gauge-invariant action.
Extended reading notes
Core claim
The paper's central claim is that an enveloping-algebra-valued gauge parameter $[abstract:s0]$ and an enveloping-algebra-valued connection on a canonically noncommutative space can both be restricted so that their components are determined by a Lie-algebra-valued parameter $[abstract:s0]$ and a Lie-algebra-valued gauge field through the Seiberg-Witten map. Concretely, writing the expansion in powers of the noncommutativity parameter $[abstract:s0]$, the terms of order $[abstract:s0]$ are assumed to be polynomials of degree $n$ in the group generators, and the paper shows that this grading is consistent: the variation of the connection closes on the same restricted form, and the composition of two restricted transformations reproduces the commutator of the underlying Lie-algebra transformations. To first order the solution is written out explicitly, with the parameter and connection corrections expressed through the ordinary field strength and its derivatives, and the resulting field strength transforms covariantly under the restricted transformation. The authors then state that the same counting holds to all orders, so that a gauge-invariant action can be built from a finite number of components $[abstract:s1]$.
Load-bearing premise
The step from the explicit first-order calculation to a claim about all orders rests on an assumed bookkeeping rule, stated in Section 3 rather than proved there: the correction at order $[abstract:s0]$ in the noncommutativity parameter is taken to be a polynomial of degree $n$ in the group generators, and the all-orders statement is then delegated to a paper listed as in preparation.
Editorial extensions
If this is right
- A noncommutative gauge theory can be written with exactly as many independent gauge fields and transformation parameters as the corresponding commutative Lie-algebra gauge theory.
- A gauge-invariant action can be built from the covariant field strength $[abstract:s0]$ using a trace over the group generators and an integral with the cyclic property, and it reduces to the usual action as the noncommutativity parameter goes to zero.
- The restricted transformations close: the commutator of two restricted transformations is again a restricted transformation, so the finite-parameter truncation is consistent rather than a first-order accident.
- The construction extends from the canonical case to Lie-type and quantum-plane noncommutativity with coordinate-dependent $[abstract:s0]$, with the same first-order formulas written in terms of the appropriate $[abstract:s0]$.
Reading between the lines
- If the grading holds at every order, noncommutative corrections to a nonabelian gauge theory cannot introduce new propagating degrees of freedom; all novelty would have to sit in the derivative structure of the star product, not in extra fields.
- The grading assumption is directly testable at second order: compute the order-$[abstract:s0]$ terms for a simple group such as $[abstract:s0]$ and check whether the corrections are indeed degree-two polynomials in the generators, or whether terms of other degrees appear.
- Because the generator degree tracks powers of the coupling, the map as constructed is a simultaneous expansion in the noncommutativity parameter and in the gauge coupling; the regime where it is trustworthy is therefore narrower than a purely geometric expansion would suggest.
- The same bookkeeping should apply if the internal space is replaced by another noncommutative algebra, so the argument is really a statement about how two star products combine, not about the canonical structure specifically.
Original abstract
An enveloping algebra valued gauge field is constructed, its components are functions of the Lie algebra valued gauge field and can be constructed with the Seiberg-Witten map. This allows the formulation of a dynamics for a finite number of gauge field components on non-commutative spaces.
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
An enveloping algebra valued gauge field is constructed, its components are functions of the Lie algebra valued gauge field and can be constructed with the Seiberg-Witten map. This allows the formulation of a dynamics for a finite number of gauge field components on non-commutative spaces.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | An enveloping algebra valued gauge field is constructed, its components are functions of the Lie algebra valued gauge field and can be constructed with the Seiberg-Witten map. | contribution 0.89 | 0.68 | 0.28 | asserted 1.00 |
| s1 | This allows the formulation of a dynamics for a finite number of gauge field components on non-commutative spaces. | interpretation 0.72 | 0.65 | 0.44 | asserted 0.82 |
What was examined, and what was not
- arXiv listing abstract v1
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- P abstract
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References
How later papers used it
50 later papers cite it
2 later papers by other authors are listed below: 2 used its method or tool.
Uses its method or tool 2 of 9 papers with this label
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Used the enveloping algebra to realize the nonabelian group as in this paper and chose a minimal expression of gauge expansion.
Probing $e^{+}e^{-}$ annihilation in noncommutative electroweak model (2008) · 0.93 · paraphrased: the licence does not allow quoting
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Followed the Seiberg-Witten method and this paper's enveloping algebra approach to formulate a noncommutative U(1) gauge theory coupled to fermionic matter.
A twisted look on kappa-Minkowski: U(1) gauge theory (2011) · 1.00 · paraphrased: the licence does not allow quoting
How the literature uses it
46 arXiv papers cite this in 65 sentences
Papers citing it · 41 sentences without a confident label
Builds on it 2 papers
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This idea was further developed in [ref] where it was shown that any commutative (but possibly nonabelian) gauge algebra can be extended to a noncommutative version by a generalization of the Seiberg-Witten map.
Quantum Space-Time and Noncommutative Gauge Field Theories · The Seiberg-Witten map · 0.93
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[ref] for non-supersymmetric gauge theories: now the noncommutative vector superfields will be valued in the enveloping algebra of the Lie algebra of the ordinary gauge group.
The Seiberg-Witten map and supersymmetry · Summary and Conclusions · 0.82
Uses its method or tool 9 papers
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To construct the NC extension of the standard model (SM) [ref] , which uses the same gauge group and particle content, or for that matter any other gauge theory, be it abelian or non-abelian, one expands the NC gauge fields in non linear power series of $Θ$ [ref] : λ_α(x,Θ) = α(x) + Θ^μν λ^(1)_μν(x;α) + Θ^μν Θ^ησ λ^(2)_μνησ(x;α) + ⋯ A_ρ(x,Θ) = A_ρ(x) + Θ^μν A^(1)_μνρ(x) + Θ^μν Θ^ησ A^(2)_μνησρ(x) + ⋯.
TeV Scale Implications of Non Commutative Space time in Laboratory Frame with Polarized Beams · Non Commutative Standard Model · 0.87
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However the Seiberg-Witten map [ref] can be used to express all fields in terms of the classical one, ending up with a finite number of fields.], and is consistent with the $⋆$-gauge transformations only if the gauge parameter satisfies the charge conjugation condition [ref] : C ϵ^_θC = ϵ^T_-θ The NC Majorana condition ([ref]) is consistent also with $⋆$-supersymmetry transformations if the supersymmetry parameter is Majorana, and the bosonic fields satisfy the charge conjugation conditions C ^_θC = ^T_-θ, C V^_θC = V^T_-θ
Noncommutative supergravity in D=3 and D=4 · Local $⋆$-supersymmetry · 0.80
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Within the enveloping-algebra framework of Refs. [ref] , one introduces at least a noncommutative field for each ordinary field.
SO(10) GUTs with large tensor representations on Noncommutative Space-time · Introducing the noncommutative fields of the noncommutative SO(10) GUT. · 0.91
Compares with it 1 paper
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Note that the action [ref] has the same form as the expanded action for the NC gauge field in the case of $θ$-constant deformation [ref] .
Gauge Theory on Twisted $\kappa$-Minkowski: Old Problems and Possible Solutions · Discussion · 0.99
Cites it as background 10 papers
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The SW map [ref] was initially developed for $U(N)$ gauge fields and Moyal-Groenewold $⋆$-products (constant noncommutativity), then applied to gauge fields of arbitrary gauge groups and extended to matter fields in [ref] .
Noncommutative gravity at second order via Seiberg-Witten map · Introduction · 0.91
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A dozen years ago, it was put forward a formalism –the enveloping-algebra formalism– which can be used to construct noncommutative gauge theories that are deformations of ordinary theories with simple gauge groups in arbitrary unitary representations [ref] .
Computing the \theta-exact Seiberg-Witten map for arbitrary gauge groups · Introduction · 0.94
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In the concept of noncommutive spacetime, there are three kinds of structure [ref] considered: (1) canonical structure, (2) Lie algebra structure, and (3) quantum space structure.
Probing $e^{+}e^{-}$ annihilation in noncommutative electroweak model · Introduction · 0.91
Discussion
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