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arxiv: 2602.04772 · v2 · pith:ZXZAZU73new · submitted 2026-02-04 · ✦ hep-ph · astro-ph.CO

Near-Resonant Thermal Leptogenesis

Pith reviewed 2026-05-16 07:00 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.CO
keywords leptogenesisright-handed neutrinosCP asymmetrybaryon asymmetryquasi-degeneratethermal leptogenesisflavour effects
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0 comments X

The pith

Quasi-degenerate right-handed neutrinos produce the baryon asymmetry down to electroweak scales without resonance.

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

This paper examines leptogenesis in the regime where right-handed neutrinos have nearly equal masses but remain non-resonant. Expanding the CP asymmetry parameter near degeneracy and imposing the condition that the mass splitting greatly exceeds the decay widths produces a universal upper bound of 1/200 on the asymmetry, independent of neutrino masses. The result demonstrates that thermal leptogenesis via right-handed neutrino decays can generate the observed matter asymmetry for masses above 100 GeV in both unflavoured and flavoured scenarios. It further shows compatibility with reheating temperatures down to 10 GeV and supplies a framework for including flavour effects during reheating. This approach lowers the required scale of leptogenesis to the electroweak range while avoiding resonance and non-thermal production mechanisms.

Core claim

In the quasi-degenerate but non-resonant regime, the CP asymmetry parameter is expanded near mass degeneracy subject to the condition ΔM > 100Γ_i, which produces the bound ε ≤ 1/200 independent of effective neutrino masses and right-handed neutrino mass. This enables successful baryon asymmetry generation by right-handed neutrino decays for M ≳ 100 GeV independent of washout regime, and during reheating down to T_RH ≃ 10 GeV, with a consistent treatment of flavour effects.

What carries the argument

The CP asymmetry parameter ε expanded near degeneracy under the non-resonance condition ΔM > 100Γ_i, which supplies the universal bound and controls the viable parameter space.

If this is right

  • Successful leptogenesis occurs for right-handed neutrino masses M ≳ 100 GeV independent of washout regime.
  • Baryon asymmetry generation remains possible with reheating temperatures as low as 10 GeV without non-thermal production.
  • Flavour effects can be incorporated consistently into near-resonant leptogenesis during reheating.
  • The leptogenesis scale reaches the electroweak range without invoking resonance.

Where Pith is reading between the lines

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

  • This regime could be probed by collider searches for right-handed neutrinos with small but non-resonant mass splittings.
  • It supplies an alternative path for low-scale seesaw models to accommodate the observed asymmetry without high reheating temperatures.
  • Extensions could test how specific flavour structures modify the 1/200 bound in concrete neutrino mass models.

Load-bearing premise

The factor of 100 in the imposed condition ΔM > 100Γ_i is sufficient to justify the perturbative expansion near degeneracy while still permitting enough asymmetry for successful leptogenesis.

What would settle it

A full calculation of the CP asymmetry for mass splittings satisfying 10Γ_i < ΔM < 100Γ_i that yields values larger than 1/200 would show the derived bound does not hold.

Figures

Figures reproduced from arXiv: 2602.04772 by Angus Spalding.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p010_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p012_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p013_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6 [PITH_FULL_IMAGE:figures/full_fig_p016_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7 [PITH_FULL_IMAGE:figures/full_fig_p017_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8 [PITH_FULL_IMAGE:figures/full_fig_p021_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9 [PITH_FULL_IMAGE:figures/full_fig_p022_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10 [PITH_FULL_IMAGE:figures/full_fig_p024_10.png] view at source ↗
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Figure 11. Figure 11: FIG. 11 [PITH_FULL_IMAGE:figures/full_fig_p025_11.png] view at source ↗
read the original abstract

We study leptogenesis in the quasi-degenerate but non-resonant regime. Expanding the CP asymmetry parameter near degeneracy and imposing the conservative non-resonance condition that the mass splitting must be much greater than the right-handed neutrino decay rates $\Delta M > 100\Gamma_i$, yields the universal upper bound $\epsilon \leq 1/200$, independent of both the effective neutrino masses and the right-handed neutrino mass. We investigate vanilla and flavoured near-resonant leptogenesis and find that successful leptogenesis by right-handed neutrino decays can occur for $M \gtrsim 100~\mathrm{GeV}$ independent of washout regime, extending the viable parameter space of thermal leptogenesis down to the electroweak scale without invoking resonance. We also analyse near-resonant thermal leptogenesis during reheating and show that successful baryon asymmetry generation is compatible with reheating temperatures as low as $T_{RH}\simeq 10\rm GeV$ without relying on non-thermal production. Finally, we present a consistent framework for incorporating flavour effects in near-resonant leptogenesis during reheating. Overall, near-resonant thermal leptogenesis offers a controlled alternative regime to resonant leptogenesis, lowering the leptogenesis scale to the electroweak scale, without reliance on a disputed regulator used in resonant leptogenesis.

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

1 major / 2 minor

Summary. The paper studies thermal leptogenesis in the quasi-degenerate but non-resonant regime. Expanding the CP asymmetry near degeneracy and imposing the condition ΔM > 100Γ_i yields a claimed universal upper bound ε ≤ 1/200 independent of effective neutrino masses and right-handed neutrino mass. It argues that successful leptogenesis remains possible for M ≳ 100 GeV and during reheating with T_RH ≃ 10 GeV, offering a controlled alternative to resonant leptogenesis without disputed regulators.

Significance. If the bound and regime validity hold, the work meaningfully extends the viable parameter space of thermal leptogenesis to the electroweak scale in a perturbative manner. The universal bound and low-scale reheating compatibility could inform model building for baryogenesis, while the flavour analysis during reheating adds a useful technical framework.

major comments (1)
  1. [expansion near degeneracy and imposition of ΔM > 100Γ_i] The derivation of the universal bound ε ≤ 1/200 (abstract) relies on imposing the specific non-resonance cutoff ΔM > 100Γ_i to truncate the near-degeneracy expansion. This factor directly sets the numerical value of the bound, yet the manuscript provides no explicit demonstration that higher-order terms remain negligible at Γ/ΔM ≈ 0.01 or that mass-dependent corrections do not re-enter; altering the cutoff factor would proportionally rescale ε_max, making the choice load-bearing rather than derived.
minor comments (2)
  1. [Abstract] The abstract states independence from effective neutrino masses and M; cross-reference the explicit equation or step in the expansion where this independence is proven.
  2. [near-resonant thermal leptogenesis during reheating] In the reheating section, clarify the precise relation between T_RH, the decay rates Γ_i, and the imposed cutoff to ensure the perturbative regime remains consistent at low temperatures.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for the positive assessment of its potential significance in extending the viable parameter space of thermal leptogenesis. We address the major comment below and agree that the justification of our non-resonance cutoff requires strengthening. We will revise the manuscript accordingly.

read point-by-point responses
  1. Referee: The derivation of the universal bound ε ≤ 1/200 (abstract) relies on imposing the specific non-resonance cutoff ΔM > 100Γ_i to truncate the near-degeneracy expansion. This factor directly sets the numerical value of the bound, yet the manuscript provides no explicit demonstration that higher-order terms remain negligible at Γ/ΔM ≈ 0.01 or that mass-dependent corrections do not re-enter; altering the cutoff factor would proportionally rescale ε_max, making the choice load-bearing rather than derived.

    Authors: We appreciate this observation. The factor of 100 in ΔM > 100Γ_i was chosen as a conservative threshold to ensure the system remains firmly in the non-resonant regime, where the leading term in the near-degeneracy expansion of the CP asymmetry dominates and higher-order contributions in powers of Γ/ΔM are strongly suppressed. At Γ/ΔM = 0.01 the next-to-leading corrections scale as (Γ/ΔM)^2 ≈ 10^{-4} and are negligible for the purposes of deriving the bound. We acknowledge, however, that the original manuscript did not contain an explicit demonstration of this suppression or an assessment of possible mass-dependent corrections. In the revised version we will add a dedicated paragraph (or short appendix) that estimates the truncation error of the expansion, compares the leading-order result to the exact expression in a benchmark case, and confirms that mass-dependent terms remain subdominant throughout the parameter region of interest. This addition will substantiate the cutoff without altering the numerical value of the bound or the main conclusions. revision: yes

Circularity Check

1 steps flagged

Universal bound ε ≤ 1/200 is constructed by imposing ΔM > 100Γ_i on the near-degeneracy expansion

specific steps
  1. fitted input called prediction [Abstract]
    "imposing the conservative non-resonance condition that the mass splitting must be much greater than the right-handed neutrino decay rates ΔM > 100Γ_i, yields the universal upper bound ε ≤ 1/200, independent of both the effective neutrino masses and the right-handed neutrino mass."

    The bound ε ≤ 1/200 is obtained by substituting the imposed cutoff ΔM = 100Γ_i into the expanded expression for the CP asymmetry. Because the asymmetry scales proportionally with Γ/ΔM in the near-degenerate expansion, the specific numerical limit is forced by the arbitrary choice of the factor 100; changing the threshold to 10 or 1000 would proportionally rescale the bound, making the result equivalent to the input condition by construction.

full rationale

The paper expands the CP asymmetry near degeneracy and then imposes the condition ΔM > 100Γ_i to obtain the bound ε ≤ 1/200. This numerical value is the direct output of evaluating the expansion at the chosen cutoff (where the expansion parameter Γ/ΔM = 0.01), so the claimed universal upper bound reduces to the modeling choice of the factor 100 rather than an independent first-principles result. The derivation chain is self-contained in the expansion plus the externally imposed threshold, with no load-bearing self-citations or other circular patterns identified from the provided text.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

The central claim rests on the validity of a perturbative expansion in the mass splitting under an externally chosen non-resonance cutoff and on the standard Boltzmann-equation treatment of leptogenesis.

free parameters (1)
  • non-resonance cutoff factor
    The numerical factor 100 in ΔM > 100Γ_i is chosen by hand to enforce the non-resonant regime.
axioms (2)
  • domain assumption Standard Boltzmann equations govern the evolution of lepton asymmetry in the early universe
    Invoked to translate the CP asymmetry into the final baryon asymmetry.
  • ad hoc to paper The perturbative expansion near degeneracy remains valid when ΔM > 100Γ_i
    This condition is imposed by the paper to derive the bound.

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Forward citations

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