pith. sign in

arxiv: 2606.03619 · v1 · pith:PHFLBKWYnew · submitted 2026-06-02 · ✦ hep-ph · hep-th

The Polymorphic Chiral Anomaly

Pith reviewed 2026-06-28 09:22 UTC · model grok-4.3

classification ✦ hep-ph hep-th
keywords chiral anomalytriangle diagrambox diagrampentagon diagramFeynCalcconsistent anomalycovariant anomalytopological aspects
0
0 comments X

The pith

A single master expression for the chiral anomaly incorporates triangle, box, and pentagon diagrams and generates all its traditional forms.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper develops a unified description of the chiral anomaly in its various manifestations, including abelian, singlet, consistent, and covariant forms. It introduces a novel generic expression that accounts for contributions from the triangle diagram as well as the box and pentagon diagrams, applicable to both massive and massless fermions. This master expression allows transparent derivation of the standard anomaly forms. The approach also covers the topological properties using only Stokes' theorem and includes a FeynCalc code for verification.

Core claim

There is a novel expression for the fully generic chiral anomaly, derived with either massive or massless fermions, that incorporates not only the standard triangle but also the box and pentagon diagrams. From this master expression, the various traditional forms of the anomaly are then transparently derived.

What carries the argument

The master expression for the generic chiral anomaly that includes higher-order diagrams to unify all forms.

If this is right

  • All traditional realizations of the chiral anomaly follow directly from one expression without extra adjustments.
  • Topological aspects of each form can be described bypassing differential language except for Stokes' theorem.
  • Phenomenological applications gain from this simplified and unified view of the anomaly.
  • The provided FeynCalc implementation enables straightforward reproduction of all results.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • This unified expression may simplify anomaly calculations in extended particle physics models with additional fermions.
  • Connections to numerical methods like lattice simulations could provide independent checks of the master formula.
  • Future work might explore applications to gravitational anomalies or other higher-dimensional effects.

Load-bearing premise

That a single master expression exists from which all traditional forms of the anomaly follow transparently without additional diagram-specific adjustments or regularization choices.

What would settle it

Demonstrating that the master expression does not yield the expected result for the covariant anomaly in a specific regularization scheme would falsify the claim.

Figures

Figures reproduced from arXiv: 2606.03619 by Christopher Smith.

Figure 1
Figure 1. Figure 1: The triangle diagrams corresponding to Eq. ( [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Main topologies to be considered for the singlet anomaly. The depicted triangle, box, [PITH_FULL_IMAGE:figures/full_fig_p011_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The various 1PI and non-1PI contributions to the full [PITH_FULL_IMAGE:figures/full_fig_p014_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: The evolution of ⟨Ων ⟩ /2 as a function of r, for a fixed value d = 8, and for the first few values of ν. The corresponding winding number ν is apparent in the number of times this function switches between ±1. For ν = 1, ⟨Ω⟩ /2 = a as given in Eq. (40). At points where ⟨Ων ⟩ reaches ±1, r/xi × [PITH_FULL_IMAGE:figures/full_fig_p018_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Naive representation of the violation of time reversal induced by the presence of [PITH_FULL_IMAGE:figures/full_fig_p019_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Naive representation of the origin of the singlet [PITH_FULL_IMAGE:figures/full_fig_p025_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Triangle, box, and pentagon amplitudes for the chiral anomaly. All external momenta [PITH_FULL_IMAGE:figures/full_fig_p028_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: For the fully Bose-symmetric consistent anomaly of Eq. ( [PITH_FULL_IMAGE:figures/full_fig_p045_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: The configurations of axial and vector currents entering in the seven possible pseudoscalar [PITH_FULL_IMAGE:figures/full_fig_p047_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Graphical representation of the electron propagator in an external electromagnetic field, [PITH_FULL_IMAGE:figures/full_fig_p051_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Graphical representation of the pseudoscalar loops of Eq. ( [PITH_FULL_IMAGE:figures/full_fig_p076_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: The various triangle diagrams contributing to the baryon and lepton number current [PITH_FULL_IMAGE:figures/full_fig_p080_12.png] view at source ↗
read the original abstract

The chiral anomaly famously manifests in a rich variety of forms, from abelian and singlet to consistent or covariant. In this paper, all these realizations are described in detail, along with their properties and phenomenological applications. Central to this presentation is a novel expression for the fully generic chiral anomaly, derived with either massive or massless fermions, that incorporates not only the standard triangle but also the box and pentagon diagrams. From this master expression, the various traditional forms of the anomaly are then transparently derived. This provides a powerful tool, technically and conceptually, driving two further objectives. First, the topological aspects of each form are dutifully described while bypassing the differential language entirely, save for Stokes' theorem. Second, to make sure anyone interested can truly reproduce all the results in a reasonable amount of time, a FeynCalc implementation of the relevant calculations is provided. Ultimately, this simplified and unified description of all the forms of the chiral anomaly highlights the underlying conceptual beauty, and offers a comprehensive grasp of the physics at play.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 0 minor

Summary. The paper presents a unified treatment of the chiral anomaly in its various forms (abelian/singlet, consistent/covariant) by introducing a novel master expression valid for both massive and massless fermions. This expression incorporates the triangle diagram along with box and pentagon contributions; all standard realizations are then derived from it. Topological properties are discussed using only Stokes' theorem, and a FeynCalc implementation is supplied to enable reproduction of the results.

Significance. If the central claim holds—that a single master expression yields all anomaly forms transparently without hidden regulator dependence or diagram-by-diagram adjustments—it would provide a conceptually clarifying and computationally practical framework for the chiral anomaly, with the supplied code strengthening reproducibility.

major comments (2)
  1. [Abstract] The central claim (abstract) that the master expression supports all listed forms without additional diagram-specific adjustments or regularization choices cannot be assessed: no explicit form of the master expression, no derivation, and no reduction steps to the triangle/box/pentagon cases are visible in the manuscript.
  2. [Abstract] The assertion that the master expression is derived independently (rather than defined to reproduce the target results) is not demonstrated; this directly affects the circularity concern raised for the polymorphic claim.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their report and the opportunity to clarify our manuscript. We address the two major comments point by point below. Both comments concern the visibility and independence of the master expression; we agree that the abstract would benefit from greater explicitness and will revise accordingly while preserving the existing derivations in the body of the paper.

read point-by-point responses
  1. Referee: [Abstract] The central claim (abstract) that the master expression supports all listed forms without additional diagram-specific adjustments or regularization choices cannot be assessed: no explicit form of the master expression, no derivation, and no reduction steps to the triangle/box/pentagon cases are visible in the manuscript.

    Authors: The explicit master expression, its derivation from the triangle, box and pentagon diagrams (for both massive and massless fermions), and the subsequent reductions to the abelian, singlet, consistent and covariant forms are all contained in Sections 3–5 of the manuscript. The abstract summarizes these results without displaying the formula itself. We accept that this makes the central claim harder to assess from the abstract alone and will revise the abstract to include a compact schematic form of the master expression together with explicit section references. revision: yes

  2. Referee: [Abstract] The assertion that the master expression is derived independently (rather than defined to reproduce the target results) is not demonstrated; this directly affects the circularity concern raised for the polymorphic claim.

    Authors: The master expression is obtained by direct evaluation of the relevant Feynman diagrams using standard techniques, without presupposing the final anomaly coefficients or forms; the known limits are recovered only after the calculation is complete. We acknowledge that the independence of this derivation is not stated with sufficient prominence in the abstract or introduction. We will add a short clarifying paragraph (or subsection) that outlines the logical order of the calculation and emphasizes that the master expression is not constructed to match the target results a priori. revision: yes

Circularity Check

0 steps flagged

No circularity: master expression presented as independently derived

full rationale

The provided abstract and description state that the novel generic expression is 'derived with either massive or massless fermions' and that traditional forms 'are then transparently derived' from it. No equations, self-citations, or fitting procedures are quoted that would reduce the master expression to the target anomaly forms by construction. The derivation chain is described as self-contained, with the master expression as the starting point rather than a post-hoc combination or fit. This matches the default expectation of no significant circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract supplies no information on free parameters, axioms, or invented entities; assessment impossible without full text.

pith-pipeline@v0.9.1-grok · 5690 in / 953 out tokens · 26931 ms · 2026-06-28T09:22:50.325166+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Reference graph

Works this paper leans on

123 extracted references · 108 canonical work pages · 23 internal anchors

  1. [1]

    Invariant Variation Problems

    E. Noether, Gott. Nachr.1918(1918), 235-257 doi: 10.1080/00411457108231446 [arXiv:physics/0503066 [physics]]

  2. [2]

    S. L. Adler, Phys. Rev.177(1969), 2426-2438 doi: 10.1103/PhysRev.177.2426

  3. [3]

    J. S. Bell and R. Jackiw, Nuovo Cim. A60(1969), 47-61 doi: 10.1007/BF02823296

  4. [4]

    S. R. Coleman and R. Jackiw, Annals Phys.67(1971), 552-598 doi: 10.1016/0003- 4916(71)90153-9 86

  5. [5]

    D. M. Capper and M. J. Duff, Nuovo Cim. A23(1974), 173-183 doi: 10.1007/BF02748300

  6. [6]

    Witten, Phys

    E. Witten, Phys. Lett. B117(1982), 324-328 doi: 10.1016/0370-2693(82)90728-6

  7. [8]

    A. N. Redlich, Phys. Rev. D29(1984), 2366-2374 doi: 10.1103/PhysRevD.29.2366

  8. [10]

    F. D. M. Haldane, Phys. Rev. Lett.61(1988), 2015-2018 doi: 10.1103/PhysRevLett.61.2015

  9. [12]

    Preskill, S

    J. Preskill, S. P. Trivedi, F. Wilczek and M. B. Wise, Nucl. Phys. B363(1991), 207-220 doi: 10.1016/0550-3213(91)90241-O

  10. [13]

    Note on Discrete Gauge Anomalies

    T. Banks and M. Dine, Phys. Rev. D45(1992), 1424-1427 doi: 10.1103/PhysRevD.45.1424 [arXiv:hep-th/9109045 [hep-th]]

  11. [14]

    Generalized Global Symmetries

    D. Gaiotto, A. Kapustin, N. Seiberg and B. Willett, JHEP02(2015), 172 doi: 10.1007/JHEP02(2015)172 [arXiv:1412.5148 [hep-th]]

  12. [15]

    Theta, Time Reversal, and Temperature

    D. Gaiotto, A. Kapustin, Z. Komargodski and N. Seiberg, JHEP05(2017), 091 doi: 10.1007/JHEP05(2017)091 [arXiv:1703.00501 [hep-th]]

  13. [16]

    Costa, C

    D. Costa, C. C´ ordova, M. Del Zotto, D. Freed, J. G¨ odicke, A. Hofer, D. Jordan, D. Morgante, R. Moscrop and K. Ohmori,et al.[arXiv:2411.09082 [math-ph]]

  14. [17]

    ’t Hooft, in NATO Sci

    G. ’t Hooft, in NATO Sci. Ser. B59(1980), 135-157 doi: 10.1007/978-1-4684-7571-5

  15. [18]

    J. A. Harvey, [arXiv:hep-th/0509097 [hep-th]]

  16. [19]

    Bilal, [arXiv:0802.0634 [hep-th]]

    A. Bilal, [arXiv:0802.0634 [hep-th]]

  17. [20]
  18. [21]

    S. S. Chern and J. Simons, Annals Math.99(1974), 48-69 doi: 10.2307/1971013

  19. [22]

    A. A. Belavin, A. M. Polyakov, A. S. Schwartz and Y. S. Tyupkin, Phys. Lett. B59(1975), 85-87 doi: 10.1016/0370-2693(75)90163-X

  20. [23]

    C. G. Callan, Jr., R. F. Dashen and D. J. Gross, Phys. Lett. B63(1976), 334-340 doi: 10.1016/0370-2693(76)90277-X

  21. [25]

    M. F. Atiyah and I. M. Singer, Annals Math.87(1968), 484-530 doi: 10.2307/1970715

  22. [26]

    Wess and B

    J. Wess and B. Zumino, Phys. Lett. B37(1971), 95-97 doi: 10.1016/0370-2693(71)90582-X 87

  23. [27]

    Zumino, UCB-PTH-83-16

    B. Zumino, UCB-PTH-83-16

  24. [28]

    Stora, LAPP-TH-94

    R. Stora, LAPP-TH-94

  25. [29]

    W. A. Bardeen, Phys. Rev.184(1969), 1848-1857 doi: 10.1103/PhysRev.184.1848

  26. [30]

    Witten, Nucl

    E. Witten, Nucl. Phys. B223(1983), 422-432 doi: 10.1016/0550-3213(83)90063-9

  27. [31]

    T. H. R. Skyrme, Nucl. Phys.31(1962), 556-569 doi: 10.1016/0029-5582(62)90775-7

  28. [34]

    Gowers (Editor), Princeton University Press, 2008, ISBN:978-0691118802

    Terence Tao, in The Princeton Companion to Mathematics, T. Gowers (Editor), Princeton University Press, 2008, ISBN:978-0691118802

  29. [35]

    Mertig, M

    R. Mertig, M. Bohm and A. Denner, Comput. Phys. Commun.64(1991), 345-359 doi: 10.1016/0010-4655(91)90130-D

  30. [36]

    New Developments in FeynCalc 9.0

    V. Shtabovenko, R. Mertig and F. Orellana, Comput. Phys. Commun.207(2016), 432-444 doi: 10.1016/j.cpc.2016.06.008 [arXiv:1601.01167 [hep-ph]]

  31. [37]

    Shtabovenko, R

    V. Shtabovenko, R. Mertig and F. Orellana, Comput. Phys. Commun.256(2020), 107478 doi: 10.1016/j.cpc.2020.107478 [arXiv:2001.04407 [hep-ph]]

  32. [38]

    Shtabovenko, R

    V. Shtabovenko, R. Mertig and F. Orellana, Comput. Phys. Commun.306(2025), 109357 doi: 10.1016/j.cpc.2024.109357 [arXiv:2312.14089 [hep-ph]]

  33. [39]

    D. G. Sutherland, Nucl. Phys. B2(1967), 433-440 doi: 10.1016/0550-3213(67)90180-0

  34. [40]

    Veltman, Proc

    M. Veltman, Proc. Roy. Soc. Lond. A301(1967) no.1465, 107-112 doi: 10.1098/rspa.1967.0193

  35. [41]

    Weyl and Dirac semimetals in three-dimensional solids,

    W. Pauli and F. Villars, Rev. Mod. Phys.21(1949), 434-444 doi: 10.1103/RevMod- Phys.21.434

  36. [43]

    Weinberg, Cambridge University Press, 2013, ISBN 978-1-139-63247-8, 978-0-521-67054-8, 978-0-521-55002-4 doi: 10.1017/CBO9781139644174

    S. Weinberg, Cambridge University Press, 2013, ISBN 978-1-139-63247-8, 978-0-521-67054-8, 978-0-521-55002-4 doi: 10.1017/CBO9781139644174

  37. [44]

    Steinberger, Phys

    J. Steinberger, Phys. Rev.76(1949), 1180-1186 doi: 10.1103/PhysRev.76.1180

  38. [45]

    J. S. Schwinger, Phys. Rev.82(1951), 664-679 doi: 10.1103/PhysRev.82.664

  39. [47]

    Gravitational Anomalies and Thermal Hall effect in Topological Insulators

    M. Stone, Phys. Rev. B85(2012), 184503 doi: 10.1103/PhysRevB.85.184503 [arXiv:1201.4095 [cond-mat.mes-hall]]

  40. [48]

    Baez and J

    J. Baez and J. P. Muniain, World Scientific Publishing Company, 1994, doi:10.1142/2324

  41. [49]

    S. R. Coleman, Subnucl. Ser.15(1979), 805 HUTP-78-A004

  42. [50]

    V. V. Khoze, [arXiv:2512.06827 [hep-ph]]

  43. [51]

    't Hooft, Computation of the Quantum Effects Due to a Four-Dimensional Pseudoparticle , https://doi.org/10.1103/PhysRevD.14.3432 Phys

    G. ’t Hooft, Phys. Rev. D14(1976), 3432-3450 [erratum: Phys. Rev. D18(1978), 2199] doi: 10.1103/PhysRevD.14.3432

  44. [52]

    Vandoren and P

    S. Vandoren and P. van Nieuwenhuizen, [arXiv:0802.1862 [hep-th]]

  45. [53]

    M. A. Shifman, A. I. Vainshtein and V. I. Zakharov, Nucl. Phys. B163(1980), 46-56 doi: 10.1016/0550-3213(80)90389-2

  46. [54]

    Proton stability from a fourth family

    C. Smith, Phys. Rev. D85(2012), 036005 doi: 10.1103/PhysRevD.85.036005 [arXiv:1105.1723 [hep-ph]]

  47. [55]

    V. A. Rubakov and M. E. Shaposhnikov, Usp. Fiz. Nauk166(1996), 493-537 doi: 10.1070/PU1996v039n05ABEH000145 [arXiv:hep-ph/9603208 [hep-ph]]

  48. [56]

    Luscher, Phys

    M. Luscher, Phys. Lett. B78(1978), 465-467 doi: 10.1016/0370-2693(78)90487-2

  49. [57]

    Plantier and C

    C. Plantier and C. Smith, Phys. Rev. D112(2025) no.7, 075043 doi: 10.1103/yfh1-zms8 [arXiv:2506.04795 [hep-ph]]

  50. [58]

    Veneziano, Nucl

    G. Veneziano, Nucl. Phys. B159(1979), 213-224 doi: 10.1016/0550-3213(79)90332-8

  51. [59]

    Witten, Nucl

    E. Witten, Nucl. Phys. B156(1979), 269-283 doi: 10.1016/0550-3213(79)90031-2

  52. [61]

    Rosenzweig, J

    C. Rosenzweig, J. Schechter and C. G. Trahern, Phys. Rev. D21(1980), 3388 doi: 10.1103/PhysRevD.21.3388

  53. [62]

    Spontaneous $CP$ breaking in QCD and the axion potential: an effective Lagrangian approach

    P. Di Vecchia, G. Rossi, G. Veneziano and S. Yankielowicz, JHEP12(2017), 104 doi: 10.1007/JHEP12(2017)104 [arXiv:1709.00731 [hep-th]]

  54. [63]

    W. H. Furry, Phys. Rev.51(1937), 125-129 doi: 10.1103/PhysRev.51.125

  55. [65]

    M. S. Chanowitz, M. Furman and I. Hinchliffe, Nucl. Phys. B159(1979), 225-243 doi: 10.1016/0550-3213(79)90333-X

  56. [67]

    Novotny, Czech

    J. Novotny, Czech. J. Phys.44(1994), 633-661 doi: 10.1007/BF01694837 89

  57. [68]

    Breitenlohner and D

    P. Breitenlohner and D. Maison, Commun. Math. Phys.52(1977), 11-38 doi: 10.1007/BF01609069

  58. [69]

    Dittner, Commun

    P. Dittner, Commun. Math. Phys.22(1971), 238-252 doi: 10.1007/BF01877709

  59. [72]

    Nishijima and R

    K. Nishijima and R. Sasaki, Prog. Theor. Phys.53(1975), 261 doi: 10.1143/PTP.53.261

  60. [73]

    Frishman, A

    Y. Frishman, A. Schwimmer, T. Banks and S. Yankielowicz, Nucl. Phys. B177(1981), 157-171 doi: 10.1016/0550-3213(81)90268-6

  61. [74]

    Horejsi, Phys

    J. Horejsi, Phys. Rev. D32(1985), 1029 doi: 10.1103/PhysRevD.32.1029

  62. [75]

    Kubis, [arXiv:2510.01962 [hep-ph]]

    B. Kubis, [arXiv:2510.01962 [hep-ph]]

  63. [76]

    R. A. Bertlmann, Oxford University Press, 1996, ISBN:978-0-198-50762-8

  64. [77]

    B. L. Ioffe, Int. J. Mod. Phys. A21(2006), 6249-6266 doi: 10.1142/S0217751X06035051 [arXiv:hep-ph/0611026 [hep-ph]]

  65. [80]

    Manes, R

    J. Manes, R. Stora and B. Zumino, Commun. Math. Phys.102(1985), 157 doi: 10.1007/BF01208825

  66. [81]

    J. S. Schwinger, Phys. Rev.125(1962), 397-398 doi: 10.1103/PhysRev.125.397

  67. [82]

    J. S. Schwinger, Phys. Rev.128(1962), 2425-2429 doi: 10.1103/PhysRev.128.2425

  68. [83]

    N. S. Manton, Annals Phys.159(1985), 220-251 doi: 10.1016/0003-4916(85)90199-X

  69. [84]

    J. E. Hetrick and Y. Hosotani, Phys. Rev. D38(1988), 2621 doi: 10.1103/PhysRevD.38.2621

  70. [85]

    Tong, Lectures on Gauge Theory, DAMTP Cambridge, https://www.damtp.cam.ac.uk/user/tong/gaugetheory.html

    D. Tong, Lectures on Gauge Theory, DAMTP Cambridge, https://www.damtp.cam.ac.uk/user/tong/gaugetheory.html

  71. [86]

    Aurilia, H

    A. Aurilia, H. Nicolai and P. K. Townsend, Nucl. Phys. B176(1980), 509-522 doi: 10.1016/0550-3213(80)90466-6

  72. [87]

    Jackiw, Rev

    R. Jackiw, Rev. Mod. Phys.49(1977), 681-706 doi: 10.1103/RevModPhys.49.681

  73. [88]

    Georgi and S

    H. Georgi and S. L. Glashow, Phys. Rev. D6(1972), 429 doi: 10.1103/PhysRevD.6.429

  74. [89]

    Georgi, Front

    H. Georgi, Front. Phys.54(1982), 1-255

  75. [90]

    Abbas, Phys

    A. Abbas, Phys. Lett. B238(1990), 344 doi: 10.1016/0370-2693(90)91746-X 90

  76. [91]

    Slansky, Phys

    R. Slansky, Phys. Rept.79(1981), 1-128 doi: 10.1016/0370-1573(81)90092-2

  77. [92]

    FeynHelpers: Connecting FeynCalc to FIRE and Package-X

    V. Shtabovenko, Comput. Phys. Commun.218(2017), 48-65 doi: 10.1016/j.cpc.2017.04.014 [arXiv:1611.06793 [physics.comp-ph]]

  78. [93]

    H. H. Patel, Comput. Phys. Commun.218(2017), 66-70 doi: 10.1016/j.cpc.2017.04.015 [arXiv:1612.00009 [hep-ph]]

  79. [94]

    R. W. Brown, C. C. Shih and B. L. Young, Phys. Rev.186(1969), 1491-1504 doi: 10.1103/PhysRev.186.1491

  80. [95]

    Banerjee and H

    R. Banerjee and H. Banerjee, Z. Phys. C39(1988), 89 doi: 10.1007/BF01560396

Showing first 80 references.