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On the second moment and non-vanishing of central values of Hecke $L$-functions of $r$-th order characters

T0 review · 3 major / 8 minor · reviewed 2026-07-30 · grok-4.5

Pith's one-line read A positive share of central values of r-th order Hecke L-functions do not vanish, for every r ≥ 3.

desk verdict Uniform MDS proof that finally gives second-moment asymptotics and positive-proportion non-vanishing for all r≥3, including the first results for r≥5 and for power-free families. read the letter →

arxiv 2607.27131 v1 pith:25Q6TTJH submitted 2026-07-29 math.NT

classification math.NT MSC 11M4111F6611R42
keywords HeckeL-functionsr-thordercharacterssecondmomentnon-vanishingmultipleDirichletseriesmollificationlargesieveKubota
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

The paper proves asymptotic formulas for the first and second twisted moments of Hecke L-functions attached to r-th order residue symbols, over number fields that contain the 2r-th roots of unity. From those formulas it concludes that a positive proportion of the central values L(1/2, χ_a) are nonzero, both when a runs over square-free ideals and when a runs over r-th power-free ideals. The argument works uniformly for every r ≥ 3 and recovers earlier cubic and quartic results while giving the first such asymptotics for r ≥ 5. The method builds multiple Dirichlet series from Gauss sums, continues them meromorphically by functional equations and large-sieve bounds, and then mollifies the moments. A sympathetic reader cares because non-vanishing of central values is a classical, stubborn problem for higher-order characters, and the paper supplies unconditional density statements that previously existed only for r = 2, 3, 4.

What carries the argument

Weyl-group multiple Dirichlet series built from Kubota series of r-th order Gauss sums. After a sieving step that isolates square-free or r-th power-free ideals, functional equations and convexity bounds produce meromorphic continuation far enough left of the critical line that a standard mollifier extracts a positive non-vanishing density.

What would settle it

Improve or disprove the large-sieve bound for the second-moment sum over pairs of r-th order characters; any improvement past the current exponent immediately enlarges the region of continuation and either captures the conjectural secondary main term or raises the proven non-vanishing proportion.

Watch

Extended reading notes

Core claim

For every integer r ≥ 3 and every number field F containing the 2r-th roots of unity, a positive proportion of the central values L(1/2, χ_a) are nonzero as a runs through square-free ideals of bounded norm (at least roughly 1/12 − ε when r = 3 and 1/(4r + 2) − ε when r ≥ 4) and likewise through r-th power-free ideals ordered by norm. These densities follow from explicit asymptotic formulas, with power-saving error terms, for the twisted first and second moments of the same L-functions.

Load-bearing premise

The power-saving error that lets the mollifier work rests on the existing large-sieve inequality for r-th order residue symbols; if that sieve is weaker, the admissible mollifier length shrinks and the positive-proportion claim can fail.

Editorial extensions

If this is right

  • Unconditional positive-density non-vanishing now holds for every order r ≥ 3, not merely for quadratic, cubic and quartic characters.
  • The same moment asymptotics apply verbatim to the r-th power-free family and give sharper error terms and secondary main terms for small r.
  • The method supplies twisted moments ready for further applications such as one-level density or low-lying zero statistics.
  • Function-field analogues of the same statements become available at once and can exploit the Riemann hypothesis to capture secondary terms already for cubic characters.

Reading between the lines

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

  • The bottleneck identified in the cubic large sieve suggests that any future improvement of Heath-Brown-type inequalities for higher-order characters would automatically upgrade both the error terms and the non-vanishing proportions obtained here.
  • Because the construction is uniform in the global field, the same densities should hold over rational function fields once the corresponding Kubota series are inserted, giving a clean comparison between number-field and function-field non-vanishing.
  • The secondary main term visible for small r is expressed in terms of Whittaker–Fourier coefficients of metaplectic theta functions; progress on those coefficients for r ≥ 4 would make the secondary term fully explicit.
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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

3 major / 8 minor

Summary. The paper establishes asymptotic formulas, with power-saving error terms, for the twisted first and second moments of Hecke L-functions attached to r-th order residue symbols (r≥3) over any number field F containing μ_{2r}, for both the square-free and the r-th power-free families (Theorems A, B, D, E and their twisted forms 10.5.2/10.11.2). Via Soundararajan-style mollification it deduces positive-proportion nonvanishing at s=1/2: at least 1/12−ε (r=3) and 1/(4r+2)−ε (r≥4) in the square-free family (Theorem C), and explicit proportions in the r-th power-free family ordered by norm (Theorem F). The method is the multiple Dirichlet series machinery of [Dia04, Dia19, DW21]: a "perfect" MDS is built from Kubota series (§4–5), the square-free/r-th-power-free sieve is implemented by Möbius inversion over series Z(s;h) (§6), convexity in the h-aspect is obtained by composing functional equations (§7), the continuation region follows from the Blomer–Goldmakher–Louvel large sieve (§8, Appendix), residues are computed explicitly (§9), and mollification is carried out in §10. For r=3,4 the results recover (and for r=4 improve) the recent cubic/quartic nonvanishing theorems; for r≥5 the second-moment asymptotic and the nonvanishing proportion are new.

Significance. If correct, this is a substantial advance: the first second-moment asymptotics with power saving for r-th order character families for all r≥5, the first unconditional positive-proportion nonvanishing for all r≥3, and the first results of either kind for the r-th power-free family even at r=3,4. The method is uniform in r and in the field, a genuine conceptual advantage over the ad hoc cubic/quartic arguments. The paper ships several verifiable strengths: fully explicit Euler products for all leading constants (Eqs. (26)–(27), (42)), consistency checks against [CFK+05] at r=2 and against [DdFDS24, CdFD26] at r=3,4 (Remark 9.2.4), and explicit, checkable numerics for the nonvanishing proportions (§10.13, including the bound α_r ≥ 1−ζ(3)/r²). The honest identification of the (MN)^{2/3} large-sieve barrier as the obstruction to secondary terms (Remark 1.1.3), in line with [DFDH26], adds credibility.

major comments (3)
  1. [§7.1.3–7.1.7, proof of Prop. 7.2.2] The h-aspect exponent (r−1)(1−σ) in Prop. 7.2.2 is the single internally derived number on which δ_κ (§8.1.3–8.1.4), the twisted rad(b)-exponent (10.2.1), the mollifier length θ_κ (10.6.1), and hence every quantitative claim in Theorems A–F depend linearly. Its derivation suppresses factors under the notation "≈" across a three-stage functional-equation chain, and the suppressed objects include the coefficients C(φ,η,t;s_3), C'(φ,η,t;s_3) of Props. 5.7.2/5.7.3, whose stated bound ≪|h|^ε at ℜ(s_3)=−ε is not proved independently but deferred to "the results of this section." Please (i) state precisely which factors are dropped at each step of §7.1.3–7.1.7 and prove they are uniformly O(|h|^ε), and (ii) add a sentence confirming that in the worst case Ic with k_v=1 (Table 1) it is the k=1 case of Lemma 4.2.2 — which, unlike k≥2, has no secondary C-term — that limits the local contribution t
  2. [§10.6.1, Eq. (38); §10.12.2] The admissible mollifier length θ_κ = (1−δ̃_κ)/(1+(2r−1)(1−δ̃_κ)) is derived under the hypothesis λ_b ≪ |b|^{−1+ε}, and the value of θ_κ enters the proportions in Theorems C and F directly (§10.13.1: proportion = (C_κ²E_κ/D_κ)ζ_F^S(n_κ)·θ_κ/(θ_κ+1)−ε'). The eventual choice of λ_κ(b) in §10.12.2 is only asserted to "satisfy the same growth estimates" as in [DdFDS24, Sec. 9]. Since the verification for general r involves the multiplicative functions G_κ, H_κ built from the polynomials P^{(κ)}_r, please include the short computation confirming λ_κ(b) ≪ |b|^{−1+ε} (and H_κ(p_v)>0, which is used for the positivity of E_κ).
  3. [§8.2.2, Prop. 8.2.2 (r=3 improvement)] The improvement A_3=1/3 rests on the bound S_ψ(σ)≪_ε Σ |e|^{2−4σ}|L(1/2,ψχ_{ae²})|²/|a|^{1+ε} and its dyadic analysis using [DdFDS24, Prop. 4.2] "or its version for a general field F in Theorem A.3.4." However, Appendix A.3.4 as stated bounds Σ_{q∈F(Q_1,Q_2)} |L(1/2,ψχ_{qh})|² with the family split as q=q_sf q_full, which is not literally the sum Σ_{q_1≍Q_1, q_2≍Q_2}|L(1/2,ψχ_{q_1 q_2² e²})|² with the e^{1/3}-dependent threshold used in the displayed dyadic estimate. Please spell out exactly how Cor. A.3.4 specializes to the inner sum in the proof of Prop. 8.2.2, including the comparison between the |e|^{1/3} and |e|^{1/2} terms under the restriction Q_1/Q_2>|e|^{1/3}.
minor comments (8)
  1. [Abstract / §1.1] The abstract claims results "over global fields," but the body proves the number-field case only, with function-field analogues merely sketched (§1.3). Either soften the abstract or state precisely which statements are proved in the function-field setting.
  2. [§1.3] "In light of the discussion in Theorem 1.1.3" should refer to Remark 1.1.3.
  3. [§2.1 and §10.1.1] The notation â := (rad a)^r/a (for (r+1)-th power-free a) is easy to confuse with the running ideal variable a and with a_0, a_1; similarly b in §10.1.1. Consider a distinct letter and a displayed definition.
  4. [§7.2.2, proof, Case II] The paragraph after Table 2 contains a broken sentence ("...is offset by the negative power of q_v coming from §7.1.6. we have ord_v f_e = l_v so ord_v j = 0..."). Please repair the flow and clarify which subcase of IIb is being discussed.
  5. [§9.0.2] The principal-part formula (A(1/2), (A'(1/2)+B'(1/2))/2) is justified only by "expressing the limit as a double limit in two ways." A two-line computation or a reference (e.g., to [DGH03] or [DW21]) would help.
  6. [§3.2.3–3.2.5] In the definition of γ(ψ_E) (Eq. (6)), note explicitly that the value is independent of the chosen dataset Δ_E (it follows from Lemma 3.2.5 and triviality of ψ_E on S-units), since γ is used in the definition of τ (Eq. (7)) throughout §4–5.
  7. [References] Several key citations are very recent preprints ([DdFDS24], [CdFD26], [DFDH26], [Ham26], [DMP+]). Please update with stable publication data where available, and double-check that [DdFDS24, Prop. 4.2] and [BGL14, Thm. 1.3] are cited with the exact statements used.
  8. [§1.1.5, Theorem C] It would be helpful to state the r=3 proportion of [DdFDS24] numerically next to 1/12−ε so the reader can gauge the cost of not optimizing over Y; currently only a qualitative remark is given.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: standard MDS-to-moments-to-mollified-nonvanishing chain with independent external and prior lemmas.

full rationale

The derivation is the classical analytic-number-theory pipeline: construct Weyl-group multiple Dirichlet series from Kubota series and Gauss sums (building on Dia04 and BB06), obtain functional equations and convexity bounds, sieve to the square-free / r-th-power-free families, continue past the polar line using the external large sieve of Blomer–Goldmakher–Louvel, extract residues for twisted first and second moments, then mollify exactly as in Soundararajan / DdFDS24 / CdFD26. Self-citations (Dia04, Dia19, DW21) supply prior MDS technology whose hypotheses do not include the target non-vanishing proportions for general r≥3; they function as independent lemmas. There is no fitted parameter renamed as a prediction, no uniqueness theorem imported to forbid alternatives, no ansatz smuggled in that already assumes the conclusion, and no self-definitional loop (moments are not defined in terms of non-vanishing, nor vice versa). Internal bookkeeping of the h-aspect convexity exponent is a correctness/fragility question, not circularity. Score 0 is the honest finding.

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

The central nonvanishing claim rests on standard analytic number theory (functional equations, Phragmén–Lindelöf, Mellin inversion, Tauberian extraction of main terms), on two external analytic inputs (large sieve for r-th order characters; meromorphic continuation of Kubota series), and on the standing arithmetic hypothesis that F contains μ_{2r} so that [BB06] applies directly. Mollifier length and test function W are free choices within ranges forced by the error exponents; they are not fitted to data. No new physical or arithmetic entities are postulated.

free parameters (3)
  • mollifier length exponent θ_κ = θ_1 = (1−δ_1)/(1+(2r−1)(1−δ_1)); for r=3, θ_1=1/11
    Chosen as large as the error term in the twisted second-moment asymptotic permits (eq. (38)); controls the nonvanishing proportion θ_κ/(θ_κ+1). Not fitted to data—forced by convexity/large-sieve abscissa.
  • Schwartz test function W
    Smooth compactly supported weight on (1,2) used to smooth the moment sums; leading coefficients involve its Mellin transform c_W. Arbitrary within the stated class; final proportions take W→1_{(1,2)}.
  • mollifier coefficients λ_κ(b) / ξ_κ(b)
    Explicitly constructed from Euler factors G_κ, H_κ in §10.12 following the Soundararajan/DdFDS24 template; not numerically fitted.
assumptions (5)
  • domain assumption F contains the group μ_{2r} of 2r-th roots of unity (so that Brubaker–Bump [BB06, Thm. 1] applies directly to Kubota series).
    Stated in §1.1.1 and Remark 1.4.1; authors note the restriction is for convenience and can in principle be removed with more work.
  • domain assumption Large sieve inequality for r-th order residue symbols [BGL14, Thm. 1.3], used to bound sums of |L(1/2,ψχ_af)|^2 (Prop. 7.2.4 and Appendix).
    Load-bearing for the abscissa of continuation of the sieved MDS and thus for power-saving errors; for r=3 the sharper [DdFDS24, Prop. 4.2] is used.
  • domain assumption Meromorphic continuation, functional equation, and convexity of the completed Kubota series eD_S(s,a,ψ) from [BB06].
    §4.1.4; poles only at 1/2±1/r; used to build the perfect MDS and its convexity bounds.
  • standard math Standard functional equations and convexity bounds for Hecke L-functions of trivial infinity type; Phragmén–Lindelöf; Mellin inversion; Landau’s lemma for Dirichlet series with nonnegative coefficients.
    Used throughout §§5–10 for contour shifts and residue extraction.
  • domain assumption O_S is a PID (S chosen large enough) and the Fisher–Friedberg extension of the r-th power residue symbol is a Hecke character of the stated conductor.
    §1.1.1–§3.1; standard setup from [FHL03, FF04].

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Pith. "Pith review of On the second moment and non-vanishing of central values of Hecke $L$-functions of $r$-th order characters." pith.science (2026). https://pith.science/paper/25Q6TTJH

@misc{pith2026260727131,
  author       = {Pith},
  title        = {Pith review of: On the second moment and non-vanishing of central values of Hecke $L$-functions of $r$-th order characters},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/25Q6TTJH}},
  note         = {Machine review of arXiv:2607.27131}
}
abstract

In this paper, we establish asymptotic formulas for the first and second twisted moments of $r$-th order Hecke $L$-functions over global fields that contain the $2r$-th roots of unity, for $r\ge 3$. We focus primarily on algebraic number fields. As a consequence, we establish a positive proportion of non-vanishing central values for these $L$-functions, specifically for families of both square-free and $r$-th power-free ideals. Our approach is based on the machinery of multiple Dirichlet series.

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