REVIEW
Weyl multiplets of N=2 conformal supergravity in five Dimensions
High Energy Physics - Theory · Submitted 12 Apr 2001 · 41 references
Pith's verdict: A careful, self-contained construction of the 5D Weyl multiplets; the real soft spot is the asserted match with (3.14), not the dualization in 5.3.
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Referee report
The paper
The paper claims
Five-dimensional conformal supergravity exists in two versions, and the authors construct both.
The reading
What carries the argument
Three pieces of machinery carry the argument. The first is the gauging of $F^2(4)$ with conventional curvature constraints, which converts $P$-gauge transformations into general coordinate transformations, solves for the dependent fields $omega_mu{}^{ab}$, $f_mu{}^a$ and $phi_mu{}^i$, and reduces the gauge fields to an irreducible set. The second is the current multiplet of the on-shell vector multiplet, a $32+32$ set of currents including the energy-momentum tensor, the supercurrent, an $SU(2)$ current, and the trace parts $theta^mu{}_mu$ and $gamma cdot J$ that would normally be improved away; the dilaton makes those trace parts physical rather than obstructions, and the coupling $int (frac{1}{2} h_{mu nu}theta^{mu nu} + dots + phi, theta^mu{}_mu)$ defines the linearized Dilaton multiplet. The third is the rewriting of the vector multiplet's equation of motion $H_a = 0$ as a Bianchi identity $D_{[a}hat H_{bcd]} = frac{3}{4}hat F_{[ab}hat F_{cd]}$ with $-frac{1}{6}varepsilon_{abcde}hat H^{edc} = 8sigma^2 T_{ab} - sigma hat F_{ab} - frac{i}{4}barpsi gamma_{ab}psi$, which is what allows the antisymmetric tensor of the Standard multiplet to be traded for a two-form gauge field and thereby produces the Dilaton multiplet.
Extended reading notes
Core claim
The central claim is that five-dimensional $N=2$ conformal supergravity admits two distinct Weyl multiplets, each with $32$ bosonic and $32$ fermionic components, sharing the same gauge fields of $F^2(4)$ but differing in the matter fields that complete them. The Dilaton multiplet is derived first, at the linearized level, by the current-multiplet method: the authors compute the full $32+32$ current multiplet of the on-shell five-dimensional vector multiplet, note that its energy-momentum tensor is neither traceless nor improvable by local gauge-invariant terms, and observe that a dilaton in the gravity multiplet can absorb the trace. Coupling each current to a field then yields the linearized transformation rules. The full non-linear rules for both multiplets come from gauging $F^2(4)$ with the conventional constraints $R_{mu nu}{}^a(P)=0$, $e^{nu b}hat R_{mu nu}{}^{ab}(M)=0$ and $gamma^mu hat R_{mu nu}{}^i(Q)=0$, which leave $21$ bosonic and $24$ fermionic independent gauge components to be completed by matter. Finally, the authors show that the two multiplets are related by an explicit non-linear field redefinition: $T_{ab}$, $chi^i$ and $D$ of the Standard multiplet are expressed in terms of the Dilaton multiplet's $sigma$, $A_mu$, $B_{mu nu}$ and $psi^i$.
Load-bearing premise
The bridge between the two multiplets depends on reading the vector multiplet's equation of motion $H_a=0$ as the Bianchi identity of a two-form gauge field, which requires the specific combination $8sigma^2 T_{ab} - sigma F_{ab} - frac{i}{4}barpsi gamma_{ab}psi$ to be expressible as the curl of a three-form.
Editorial extensions
If this is right
- A superconformal tensor calculus for $N=2$, $D=5$ becomes available: matter multiplets can be coupled to either Weyl multiplet and the resulting Poincaré supergravities read off, giving an independent route to the general five-dimensional matter couplings previously obtained by other means.
- The two-multiplet structure found in six dimensions for $(1,0)$ conformal supergravity is confirmed to recur in five dimensions, with the antisymmetric tensor $T_{ab}$ of the Standard multiplet dual to the vector and two-form of the Dilaton multiplet.
- The modified (soft) supersymmetry algebra is given explicitly, with field-dependent parameters including a $T$-dependent Lorentz rotation, a $T$-dependent $SU(2)$ rotation, and in the Dilaton version an extra $U(1)$ and vector gauge transformation; any matter multiplet coupled to these Weyl multiplets must close on this algebra.
- The $40+40$ supercurrent multiplet of Howe and Lindström is shown to be reducible, splitting into the $32+32$ current multiplet used here plus an $8+8$ multiplet whose currents match an off-shell vector multiplet.
- Because the Standard Weyl multiplet has no zero-mass-dimension scalar, it cannot serve as a compensating multiplet for scale invariance; only the Dilaton version can, which explains why the current-multiplet construction lands on the Dilaton version directly.
Reading between the lines
- If the two multiplets are genuinely equivalent on the fields they share, then the choice between them is a choice of gauge fixing rather than of theory, which would let calculations switch representations mid-stream, for instance using the two-form $B_{mu nu}$ when a dualized field strength is convenient and $T_{ab}$ when it is not.
- The paper's own note that non-local improvement terms were not analysed leaves open whether the Standard multiplet can be reached from a current multiplet directly; a non-local improvement of the vector current multiplet would be the natural place to look, by analogy with the ten-dimensional case the authors cite.
- The parallel drawn with four dimensions in the concluding table suggests a Dilaton multiplet in $D=4$ containing two vectors; checking whether the same equation-of-motion-to-Bianchi-identity trick works there would test whether this mechanism is dimensional or accidental.
- The soft algebra's field-dependent parameters, in particular the $T$-dependent Lorentz and $SU(2)$ rotations, constrain what a consistent matter multiplet can look like; a matter multiplet whose supersymmetry variation fails to reproduce those parameters would be ruled out without any further calculation.
Original abstract
We construct the Weyl multiplets of N=2 conformal supergravity in five dimensions. We show that there exist two different versions of the Weyl multiplet, which contain the same gauge fields but differ in the matter field content: the Standard Weyl multiplet and the Dilaton Weyl multiplet. At the linearized level we obtain the transformation rules for the Dilaton Weyl multiplet by coupling it to the multiplet of currents corresponding to an on-shell vector multiplet. We construct the full non-linear transformation rules for both multiplets by gauging the D=5 superconformal algebra F^2(4). We show that the Dilaton Weyl multiplet can also be obtained by solving the equations of motion for an improved vector multiplet coupled to the Standard Weyl multiplet.
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 construct the Weyl multiplets of N=2 conformal supergravity in five dimensions. We show that there exist two different versions of the Weyl multiplet, which contain the same gauge fields but differ in the matter field content: the Standard Weyl multiplet and the Dilaton Weyl multiplet. At the linearized level we obtain the transformation rules for the Dilaton Weyl multiplet by coupling it to the multiplet of currents corresponding to an on-shell vector multiplet. We construct the full non-linear transformation rules for both multiplets by gauging the D=5 superconformal algebra F^2(4). We show that the Dilaton Weyl multiplet can also be obtained by solving the equations of motion for an improved vector multiplet coupled to the Standard Weyl multiplet.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We construct the Weyl multiplets of N=2 conformal supergravity in five dimensions. | contribution 1.00 | 0.96 | 0.40 | asserted 1.00 |
| s1 | We show that there exist two different versions of the Weyl multiplet, which contain the same gauge fields but differ in the matter field content: the Standard Weyl multiplet and the Dilaton Weyl multiplet. | result 0.87 | 0.92 | 0.43 | asserted 1.00 |
| s2 | At the linearized level we obtain the transformation rules for the Dilaton Weyl multiplet by coupling it to the multiplet of currents corresponding to an on-shell vector multiplet. | method 0.70 | 0.95 | 0.06 | asserted 1.00 |
| s3 | We construct the full non-linear transformation rules for both multiplets by gauging the D=5 superconformal algebra F^2(4). | method 0.51 | 0.96 | 0.24 | asserted 1.00 |
| s4 | We show that the Dilaton Weyl multiplet can also be obtained by solving the equations of motion for an improved vector multiplet coupled to the Standard Weyl multiplet. | result 0.86 | 0.92 | 0.16 | asserted 1.00 |
What was examined, and what was not
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References
How the literature uses it
43 arXiv papers cite this in 96 sentences
Papers citing it · 62 sentences without a confident label
Uses its method or tool 5 papers
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To avoid these issues, we instead make use of supersymmetry, and in particular the result of [ref] , which worked out the supersymmetric completion of the $A∧ R∧R$ term in $𝒩=2$ supergravity coupled to an arbitrary number of vector multiplets using the superconformal tensor calculus methods developed in [ref] .
Black holes in five-dimensional gauged supergravity with higher derivatives · Introduction · 0.82
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To construct the 4d dilaton Weyl multiplet, we will follow the same procedure used in in five dimensions [ref] : we couple an $N=2$ vector multiplet to the standard Weyl multiplet and use the equations of motion to eliminate the auxiliary fields.
$N=2$ dilaton Weyl multiplet in 4D supergravity · The standard Weyl multiplet and its (un)conventional constraints · 0.93
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Upon setting the gauginos as well as the $M$ and $Y_ij$ scalar to zero, the only non-trivial supersymmetry variation is [ref]
Supersymmetrizing 5d instanton operators · Supersymmetric Yang monopoles in five-dim. gauge theories · 0.81
Compares with it 4 papers
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For signature $(1,4)$ the resulting reality properties of symplectic Majorana spinor bilinears and supersymmetry variations agree with [ref] and [ref] .
Five-dimensional vector multiplets in arbitrary signature · Supersymmetry variations · 0.99
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Note that this is a feature which is absent in the constructions of half-maximally supersymmetric dilaton Weyl multiplets [ref] .
Torus reduction of maximal conformal supergravity · Gauge fixing the R-symmetry group · 0.96
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In four and five dimensions [ref] the Weyl 1 multiplet can be used as an independent multiplet to construct a pure Poincaré action, not leading to inconsistencies and having proper kinetic terms for the matter fields.
Off-shell N=(1,0), D=6 supergravity from superconformal methods · Conclusions · 0.94
Cites it as background 19 papers
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The dilaton Weyl multiplet was known for the minimal conformal supergravity in five and six dimensions since long [ref] and was recently discovered in $N=2$ conformal supergravity four dimensions [ref] .
Curvature squared action in four dimensional $N=2$ supergravity using the dilaton Weyl multiplet · Introduction · 0.91
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Most of the results presented in this and the next section can be found in [ref] .
Off-shell D=5, N=2 Riemann Squared Supergravity · Conformal Multiplets · 0.97
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The dilaton Weyl multiplets have also been constructed for various dimensions and supersymmetries such as for $N=1$ conformal supergravity in five dimensions in [ref] , $(1,0)$ conformal supergravity in six dimensions [ref] , $N=2$ conformal supergravity in five dimensions [ref] as well as $N=4$ conformal supergravity in four dimensions [ref] .
$SU(2)\times SU(2)$ dilaton Weyl multiplets for maximal conformal supergravity in four, five, and six dimensions · Introduction · 0.81
Discussion
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