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UV completions of scalar-tensor EFTs

T0 review · 1 major / 3 minor · reviewed 2026-08-06 · deepseek-v4-flash

Pith's one-line read The paper argues that shift-symmetric scalar Gauss-Bonnet gravity has no UV completion among weakly coupled one-loop models with massive spin-0, 1/2, and 1 matter, whereas dynamical Chern-Simons gravity is UV-completable, uniquely via a…

desk verdict Careful one-loop matching paper that scopes a no-go: shift-symmetric SGB is not generated by these simple UV completions, while DCS is via the PQ model; the 'unique' wording is the only real blemish. read the letter →

arxiv 2507.11426 v1 pith:XWJ22VP7 submitted 2025-07-15 hep-th hep-ph

classification hep-thhep-ph
keywords scalar-tensorEFTscalarGauss-BonnetgravitydynamicalChern-Simonsone-loopmatchingon-shellamplitudesspinor-helicityformalismshiftsymmetryPeccei-Quinn
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper asks which ultraviolet (UV) completions can produce low-energy scalar-tensor theories of gravity in which a massless scalar couples to the Gauss-Bonnet invariant (SGB) or to the Chern-Simons invariant (DCS). Working with one-loop matching between a UV theory of massive spin-0, spin-1/2, and spin-1 particles and the low-energy effective field theory, it derives explicit formulas for the SGB and DCS Wilson coefficients in terms of UV masses and couplings. The central qualitative result is an asymmetry: a shift-symmetric SGB theory cannot be obtained from any of these UV setups, because shift-symmetry-breaking operators such as $\phi R^3$ and $\phi^2 R_{\rm GB}^2$ are generated along with $C_{\phi GB}$; the shift-symmetric DCS theory, by contrast, has a unique UV completion, a fermion plus complex scalar with a Peccei-Quinn symmetry. The results matter because SGB and DCS are widely studied gravity extensions that predict black-hole scalar hair and gravitational-wave signatures, and knowing which ones have sensible UV completions tells theorists which effective theories to take seriously.

What carries the argument

The load-bearing machinery is the on-shell matching of one-loop four-point amplitudes in the spinor-helicity formalism. For each heavy species the paper builds tree-level three- and four-point amplitudes from minimal gravitational couplings and cubic scalar couplings, computes the $s$-channel discontinuity of the one-loop amplitude as a two-body phase-space integral over an intermediate heavy pair, and reconstructs the full amplitude in a basis of scalar integrals (tadpole, bubble, triangle, box). Expanding in the ratio of external energy to heavy mass and comparing with the EFT amplitude fixes the Wilson coefficients, with the decisive convention that rational terms growing as the heavy mass goes to zero are forbidden; this is what makes the coefficients predictive. The same calculation applied to the two-graviton-two-scalar amplitude fixes the dimension-six coefficients $C_{\phi^2 GB}$ and $C_{\phi^2 CS}$.

What would settle it

Repeat the one-loop matching with an independent off-shell method, or with a non-minimal gravitational coupling such as an anomalous quadrupole term for the vector; if a minimal-coupling model within this class is found with $C_{\phi GB}\neq 0$ and all shift-symmetry-violating coefficients vanishing without tuned contact terms, the central claim is false.

Watch

Extended reading notes

Core claim

At one loop, integrating out massive spin-0, spin-1/2, and spin-1 particles that are minimally coupled to gravity and coupled to a massless scalar gives the dimension-five Wilson coefficients in Eq. (4.15): $$C_{\phi GB} = -\frac{y_0}{1440\$pi^{2}$ m_\Phi} - \frac{7 y_s}{2880\$pi^{2}$ m_\Psi} - \frac{11 y_d - 2 y_m}{240\$pi^{2}$ M_*}, \qquad C_{\phi CS} = -\frac{y_p}{192\$pi^{2}$ m_\Psi} - \frac{y_a}{24\$pi^{2}$ M_*},$$ up to $O(M_*^{-1})$ corrections. The qualitative discovery is the asymmetry summarized in Sec. 4.3: for every UV setup considered, either the SGB coupling $C_{\phi GB}$ is absent or it is accompanied by shift-symmetry-breaking operators such as $\phi R^3$ and $\phi^2 R_{\rm GB}^2$. Consequently, within this class of models the shift-symmetric scalar Gauss-Bonnet theory is not UV-completable, while the dynamical Chern-Simons coupling has a unique shift-symmetric completion: the scalar is the Goldstone boson of a spontaneously broken $U(1)_{\rm PQ}$ acting chirally on a heavy fermion.

Load-bearing premise

The conclusions rest on the assumptions that heavy particles couple to gravity only through the standard minimal coupling and that unphysical rational pieces of the one-loop amplitudes are fixed by demanding a smooth limit as the heavy mass goes to zero; if either assumption is relaxed, the predicted operator pattern, including the SGB no-go, can change.

Editorial extensions

If this is right

  • A shift-symmetric scalar Gauss-Bonnet theory cannot be embedded as a low-energy limit of any of the considered weakly coupled UV completions without also generating shift-symmetry-violating operators like $\phi R^3$ and $\phi^2 R_{\rm GB}^2$.
  • The dynamical Chern-Simons coupling can be generated shift-symmetrically, and the only predictive option found in this class is a heavy fermion with a complex scalar endowed with a Peccei-Quinn symmetry, whose anomaly matches the DCS coupling.
  • For heavy vector matter the SGB and DCS coefficients are suppressed by the UV cutoff $M_*$ and are of the same order as uncontrolled rational terms, so spin-1 completions are not predictive for these couplings; the authors expect this to persist for higher spins.
  • In the predictive spin-0 and spin-1/2 completions, lower-dimensional operators such as $\phi^3$ and $\phi^4$ are generically generated, so phenomenological studies should include the full tower of operators rather than only the shift-symmetric terms.
  • The matching reproduces the known $R^3$ Wilson coefficients as a cross-check, supporting the reliability of the on-shell method for the new coefficients.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • An implication the authors leave implicit is that any parity-even shift-symmetric gravitational scalar coupling faces the same obstacle: without a parity-odd partner enforcing the symmetry, loop effects from minimal matter will always produce shift-breaking companions.
  • If the smooth-$m\to 0$ rational-term convention were wrong, the spin-0 and spin-1/2 SGB coefficients could be shifted by scheme-dependent rational terms, so an independent off-shell effective-action computation of the same coefficients would settle the robustness of the matching.
  • A direct extension would be to repeat the matching with non-minimal gravitational couplings for the heavy fields; the paper notes this could generate $\widetilde{C}_{R^3}$ and change the operator pattern, so the SGB no-go may weaken in that larger class.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

1 major / 3 minor

Summary. The paper performs a one-loop matching between a UV theory containing massive spin-0, spin-1/2, and spin-1 particles minimally coupled to gravity, and a low-energy scalar-tensor EFT of a massless scalar and the graviton. Using on-shell amplitude methods and unitarity cuts, the authors derive Wilson coefficients for the scalar Gauss-Bonnet (SGB), dynamical Chern-Simons (DCS), and related operators in terms of UV masses and couplings. The central results are Eqs. (4.15) and (4.16) for the dimension-5 and dimension-6 coefficients, Eq. (4.17) for the R3 coefficients, and the qualitative conclusion in Sec. 4.3 that shift-symmetric SGB is not generated within the considered class, while DCS can be generated shift-symmetrically only via a U(1)_PQ model with a heavy fermion.

Significance. If the results hold, this is a valuable contribution to scalar-tensor EFTs, mapping out which weakly coupled UV completions can produce SGB and DCS interactions. The paper is unusually transparent: the rational-term ambiguity is isolated in δR, the R3 coefficients reproduce Refs. [45,46], the DCS coefficient is consistent with anomaly matching in Ref. [41], and the spin-1 non-predictivity and minimal-coupling assumptions are explicitly disclosed. These features, together with the explicit formulas for the Wilson coefficients, give the central claims a high degree of credibility and make the paper useful for follow-up work on scalar-tensor phenomenology and UV-completion constraints.

major comments (1)
  1. [Sec. 4.3, after Eq. (4.22)] The contact-term assignment for the U(1)_PQ model is misstated. The text sets cΨ = M∗/mΨ, but consistency with Eq. (4.16) requires cΨ = y_p^2 M∗/mΨ: substituting cΨ = M∗/mΨ into C_phi2GB for ys = 0 gives 7(1 - y_p^2)/(2880π^2 mΨ^2), which vanishes only for y_p^2 = 1. Since y_p is a free Yukawa coupling and is not set to unity anywhere in the model, the claimed cancellation of the shift-symmetry-violating coefficient is not demonstrated for general y_p. The qualitative conclusion is recoverable once the factor y_p^2 is restored, so this is a correctable error, but it affects a load-bearing step of the DCS shift-symmetry argument.
minor comments (3)
  1. [Sec. 4.3, positivity remark] The statement that C'_4 > 0 is 'easily shown to be satisfied' in the entire parameter space is not immediate for the spin-1 contribution in Eq. (4.19), where the log(μ^2/m_V^2) term is negative for μ < m_V; the authors should justify the sign or qualify the claim to the stated matching scale.
  2. [Sec. 4.3] The expression 'cΨ = M∗/m' has a typo (missing subscript on the mass); the corrected relation is cΨ = y_p^2 M∗/mΨ as noted in the major comment.
  3. [Sec. 4.1] The sentence 'we are not allowed to introduce rational terms scaling with inverse powers of mΦ' could usefully include a footnote clarifying that the physical C_phiGB ~ 1/m term arises from the cut integrals and is not part of the rational-term ambiguity, which affects only terms with non-negative powers of m.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the Wilson coefficients are obtained by genuine one-loop matching to independent EFT amplitudes, and the no-go is explicitly scoped to the stated UV model class.

full rationale

The central results, Eqs. (4.15) and (4.16), are derived by computing one-loop UV amplitudes via unitarity cuts, expanding in E/m, and matching the resulting pole and contact terms to the independent EFT amplitude formulas in Eqs. (2.11)–(2.13). The coefficients C_phiGB and C_phiCS are read off from the coefficients of the (1/s + 1/t + 1/u) terms in the matched amplitude, e.g. from Eq. (4.8) to Eq. (4.9); they are not tuned to reproduce a desired SGB or DCS result. The rational-term fixing is an explicitly stated physical requirement: 'we are not allowed to introduce rational terms scaling with inverse powers of m_Phi', and the paper acknowledges that dimension-four and lower coefficients are consequently ambiguous. That is a premise about the UV theory having a smooth massless limit, not a fit to the target coefficients. The R3 result is cross-checked against Refs. [45,46], where [45] is an independent calculation and [46] supplies the matching method; the agreement provides external support for the method. The DCS consistency check uses an independent anomaly equation from Ref. [41], whose authors do not overlap with the present paper. The 'unique' PQ claim is explicitly restricted to the considered model class ('within our setup' in the abstract; 'within the considered class of models' in Sec. 5), and the paper itself flags that non-minimal gravitational couplings could change the pattern after Eq. (4.17). No load-bearing step reduces by construction to its own input, and no central claim depends on an unverified self-citation.

Assumptions & free parameters 3 free parameters · 5 assumptions · 0 invented entities

The paper performs a matching calculation, not a fit: UV masses and couplings are inputs, and the EFT coefficients are derived functions of them. There are no data-fitted free parameters. The main extra assumptions are the minimal gravitational coupling of heavy matter (Eq. 3.1), the rational-term fixing via smooth m -> 0 limit (Sec. 4.1), and the standard EFT basis and regularization choices. No new particles or forces are introduced; the UV fields Phi, Psi, and V are standard massive fields, and the PQ complex-scalar and fermion model is taken from Refs. [41,42].

free parameters (3)
  • Heavy matter masses m_Phi, m_Psi, m_V = input spectrum (not fitted)
    Set the EFT cutoff and appear as 1/m in the matched Wilson coefficients (Eqs. 4.15 to 4.19); the paper does not predict them.
  • Cubic scalar-matter couplings y0, ys, yp, yd, ya, ym = input couplings (not fitted)
    These UV couplings determine the sign and size of C_phiGB and C_phiCS (Eq. 4.15) and the higher-dimension coefficients; no data are used to fix them.
  • UV contact-term coefficients c_Phi, c_Psi, ec_Psi, c_V, ec_V, chat_V = arbitrary (not determined)
    Enter the 4-point UV amplitudes (Eqs. 3.6, B.3, B.6); c_Phi controls C_phi2GB = (y0^2 - c_Phi)/(1440 pi^2 m_Phi^2), so the SGB shift-symmetry-breaking conclusion is generic rather than unconditional.
assumptions (5)
  • domain assumption Heavy matter is minimally coupled to gravity; only the scalar-matter cubic couplings in Eq. (3.2) are considered.
    This defines the model class and is the condition under which the SGB no-go and DCS uniqueness hold; non-minimal gravitational couplings such as anomalous quadrupole terms would alter the generated operator pattern, as the authors acknowledge after Eq. (4.17).
  • ad hoc to paper The one-loop rational-term ambiguity is fixed by requiring a smooth m -> 0 limit, so rational terms cannot scale as inverse powers of m.
    Used in Sec. 4.1 around Eq. (4.7) to extract coefficients that scale as 1/m; without this assumption the Wilson coefficients of dimension-four and lower operators are ambiguous and spin-1 contributions are nonpredictive.
  • domain assumption The UV theory is weakly coupled and the heavy masses m satisfy m << M* <= M_Pl, so one-loop matching and E/m expansions are valid.
    Assumed in Section 3 and used to expand amplitudes in powers of E/m throughout Section 4; it also underlies the statement that spin-1 contributions are suppressed by 1/M*.
  • standard math The EFT operator basis in Section 2 is complete up to dimension 8 after discarding total derivatives and field-redefinition-removable terms such as phi R, R^2, and phi^2 R.
    Basis choice explained below Eq. (2.2); matching to this basis defines the extracted Wilson coefficients.
  • standard math Dimensional regularization with d = 4 - 2 epsilon and tadpole adjustment c1 removes non-local UV divergences.
    Used in Appendix A.2 and Sec. 4.1; standard in on-shell matching and needed to reconstruct the full one-loop amplitudes from discontinuities.

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Cite this review

Pith. "Pith review of UV completions of scalar-tensor EFTs." pith.science (2026). https://pith.science/paper/XWJ22VP7

@misc{pith2026250711426,
  author       = {Pith},
  title        = {Pith review of: UV completions of scalar-tensor EFTs},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/XWJ22VP7}},
  note         = {Machine review of arXiv:2507.11426}
}
abstract

We study models that give rise to scalar-tensor effective field theories (EFTs) at low energies. Our framework involves massive particles of spin $S=0, 1/2, 1$ coupled to gravity and to a real massless scalar in the UV. Integrating out the massive states leads to a scalar-tensor EFT describing the massless graviton and scalar degrees of freedom. Using the on-shell amplitude methods and the spinor-helicity formalism, we match the two frameworks at one loop, so as to express the EFT Wilson coefficients in terms of the UV masses and coupling. We explore the space of the operators generated in the EFT, including the ones related to the scalar Gauss-Bonnet (SGB) and dynamical Chern-Simons (DCS) gravity theories. We demonstrate that, within our setup, the SGB interactions are always generated with shift-symmetry breaking operators. This is in contrast to the DCS case, where there is a unique choice that preserves the shift symmetry in the IR, corresponding to a theory of spin 1/2 fermions and a complex scalar with a Peccei-Quinn global symmetry.

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Reviewed August 6, 2026 · model on record in the stance chip above.