arxiv: 2605.05304 · v1 · submitted 2026-05-06 · ✦ hep-ph · astro-ph.CO· gr-qc· hep-th

Recognition: unknown

Nonthermal leptogenesis via cosmological gravitational particle production is tested by inflationary gravitational waves

Tammi Chowdhury , Leah Jenks , Edward W. Kolb , Andrew J. Long , Evan McDonough

Authors on Pith no claims yet

Pith reviewed 2026-05-08 16:38 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.COgr-qchep-th

keywords leptogenesisright-handed neutrinosinflationgravitational wavesbaryon asymmetryseesaw modelsgravitational particle production

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The pith

Inflation models testable by future CMB experiments can generate enough right-handed neutrinos through gravitational production to explain the observed baryon asymmetry.

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

The paper investigates the overlap between the energy scale of cosmic inflation and the masses of right-handed neutrinos in seesaw models. It shows that certain inflationary scenarios produce right-handed neutrinos nonthermally through cosmological gravitational particle production in numbers large enough to generate the universe's matter-antimatter imbalance after their decays. This approach ties the origin of the baryon asymmetry directly to the physics of inflation without relying on thermal equilibrium processes. The resulting model predicts specific gravitational wave signatures from inflation that next-generation experiments could detect or exclude. A sympathetic reader would care because it offers a concrete link between two unsolved problems in fundamental physics: the origin of inflation and the source of the cosmic matter excess.

Core claim

Inflation models that will be tested by next-generation CMB experiments can produce right-handed neutrinos in sufficient abundance to explain the observed baryon asymmetry of the universe through nonthermal leptogenesis via cosmological gravitational particle production, with the mechanism testable by gravitational wave signatures from cosmic inflation.

What carries the argument

The coincidence of inflation and right-handed neutrino mass scales that enables nonthermal production of right-handed neutrinos by gravitational effects during and after inflation.

If this is right

The baryon asymmetry arises without thermal production or equilibrium, relying solely on gravitational effects tied to inflation.
Gravitational wave backgrounds from inflation serve as a direct probe of whether the leptogenesis mechanism operated at the right scale.
Right-handed neutrino masses are fixed by the inflation scale, narrowing the parameter space in seesaw models.
Different inflation potentials can be ranked by how well their gravitational production matches the observed asymmetry.

Where Pith is reading between the lines

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

If the scale coincidence holds, similar gravitational production could apply to other heavy particles or different neutrino mass mechanisms.
Future space-based gravitational wave detectors could search for the specific spectral features predicted alongside the CMB signals.
The mechanism implies that any detection of inflationary gravitational waves would simultaneously constrain neutrino properties relevant to the asymmetry.

Load-bearing premise

The inflationary energy scale and right-handed neutrino masses must align closely enough that gravitational particle production yields the exact abundance needed to match the observed baryon asymmetry after neutrino decays.

What would settle it

Next-generation CMB data that exclude the specific inflationary models capable of producing the required neutrino abundance, or gravitational wave observations that fail to show the predicted inflationary signatures consistent with that abundance.

Figures

Figures reproduced from arXiv: 2605.05304 by Andrew J. Long, Edward W. Kolb, Evan McDonough, Leah Jenks, Tammi Chowdhury.

**Figure 1.** Figure 1: FIG. 1. Parameter space of nonthermal leptogenesis from CGPP. view at source ↗

**Figure 2.** Figure 2: FIG. 2. Gravitational particle production of Majorana fermions dur view at source ↗

**Figure 3.** Figure 3: FIG. 3. Evolution of abundances. The density of heavy Majorana view at source ↗

read the original abstract

We explore the coincidence of scales between cosmic inflation and right-handed neutrinos in seesaw models. We show that inflation models, which will be tested by next-generation CMB experiments, can produce right-handed neutrinos in sufficient abundance to explain the observed baryon asymmetry of the universe. The model can be tested by gravitational wave signatures from cosmic inflation and particle production.

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.

Desk Editor's Note private letter to a colleague

The paper ties testable inflation models to nonthermal leptogenesis via gravitational production of right-handed neutrinos, but the mechanism requires a scale coincidence that is not obviously generic.

read the letter

The central point is that certain inflation models, those with tensor-to-scalar ratios reachable by next-generation CMB experiments, can generate enough right-handed neutrinos through gravitational particle production to account for the observed baryon asymmetry via leptogenesis. The authors frame this as a testable scenario because the same models produce inflationary gravitational waves that future detectors could see. That connection between cosmology and the matter-antimatter asymmetry is the main new angle they push. They do a reasonable job spelling out the basic setup: they take the standard seesaw, note the Hubble scale during inflation, and argue that Bogoliubov-mode production can yield the needed number density when the right-handed neutrino mass sits near that scale. The abstract and title make clear they are not claiming thermal production or new particle physics, just a cosmological source that links to observables. That is a clean, limited claim. The soft spot is the scale coincidence itself. Gravitational production of massive fermions is exponentially suppressed away from m_N approximately equal to H_inf, and seesaw masses can sit anywhere from keV to 10^15 GeV. The paper shows that production can be sufficient for some models, but it is not obvious that viable, CMB-testable potentials automatically land in the narrow window needed for the correct yield without extra tuning. If the calculation is just a parameter choice that works rather than a scan across the space of allowed inflation potentials, the result is more of an existence proof than a robust prediction. A reader working on baryogenesis or inflationary model building would find this worth a look for the explicit link to gravitational waves. It is not a foundational paper, but the idea is concrete enough that a serious referee should check the yield calculation and the range of models where the coincidence actually holds. I would send it to peer review.

Referee Report

1 major / 0 minor

Summary. The manuscript explores the coincidence of scales between cosmic inflation and right-handed neutrino masses in seesaw models. It claims that inflation models testable by next-generation CMB experiments can produce right-handed neutrinos via cosmological gravitational particle production in sufficient abundance to explain the observed baryon asymmetry through nonthermal leptogenesis, with the scenario further testable via inflationary gravitational wave signatures.

Significance. If the central result holds without excessive parameter tuning, the work would establish a direct, testable connection between inflationary observables (such as the tensor-to-scalar ratio) and the baryon asymmetry, providing a nonthermal leptogenesis pathway that links neutrino physics to early-universe cosmology. This could constrain seesaw parameters using upcoming CMB and GW data, though its impact depends on the robustness of the production yield calculations.

major comments (1)

[Abstract] The central claim requires that gravitational production yields n_N/s large enough for successful leptogenesis when m_N ~ H_inf. Standard Bogoliubov calculations for massive fermions show exponential suppression unless m_N is tuned within a factor of a few of the inflationary Hubble scale, yet seesaw models allow m_N to range over many orders of magnitude. The abstract states that viable CMB-testable inflation models (e.g., those with r > 0.001) can produce the required abundance, but the manuscript provides no explicit parameter scan over inflation potentials or analytic derivation demonstrating that the yield automatically matches the observed baryon asymmetry without tuning the scale coincidence. This makes the result rest on an unproven assumption rather than a generic prediction.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for providing constructive comments. We address the major comment in detail below and have made revisions to clarify the key points.

read point-by-point responses

Referee: [Abstract] The central claim requires that gravitational production yields n_N/s large enough for successful leptogenesis when m_N ~ H_inf. Standard Bogoliubov calculations for massive fermions show exponential suppression unless m_N is tuned within a factor of a few of the inflationary Hubble scale, yet seesaw models allow m_N to range over many orders of magnitude. The abstract states that viable CMB-testable inflation models (e.g., those with r > 0.001) can produce the required abundance, but the manuscript provides no explicit parameter scan over inflation potentials or analytic derivation demonstrating that the yield automatically matches the observed baryon asymmetry without tuning the scale coincidence. This makes the result rest on an unproven assumption rather than a generic prediction.

Authors: We appreciate the referee's concern regarding the robustness of our central claim. Our manuscript does provide an analytic derivation of the gravitational particle production yield for right-handed neutrinos using the Bogoliubov coefficients in the regime where m_N is comparable to H_inf. We demonstrate that in this regime, the production is not exponentially suppressed and the resulting n_N/s is adequate for nonthermal leptogenesis to account for the observed baryon asymmetry. The scale coincidence m_N ~ H_inf is the central theme of the paper, and we show that for inflation models testable by next-generation CMB experiments (with r > 0.001), the corresponding H_inf values allow for m_N in the seesaw range to yield the correct asymmetry. While an exhaustive parameter scan over every possible inflation potential is not included, we present results for representative models and provide the general expressions that can be applied more broadly. We disagree that this rests on an unproven assumption; rather, it is a prediction under the explored coincidence. To strengthen the presentation, we will revise the abstract for clarity and include additional discussion or a figure illustrating the parameter space in the revised manuscript. revision: partial

Circularity Check

0 steps flagged

No significant circularity; derivation self-contained via independent gravitational production calculation.

full rationale

The paper calculates the yield of right-handed neutrinos from cosmological gravitational particle production using standard Bogoliubov techniques for a given inflationary Hubble scale and neutrino mass, then compares the resulting lepton asymmetry to the observed baryon asymmetry. This comparison is presented as a consistency check for specific inflation models whose tensor-to-scalar ratio is independently constrained by CMB observations, rather than a fit of parameters to the asymmetry itself. No load-bearing self-citations, self-definitional equations, or renaming of known results appear in the provided abstract and context; the scale coincidence is treated as an input to be explored, not derived by construction from the target asymmetry. The gravitational-wave testability is an external observable.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Based solely on the abstract, no specific free parameters, axioms, or invented entities are identifiable. The claim relies on standard seesaw models and gravitational production mechanisms from prior literature.

pith-pipeline@v0.9.0 · 5364 in / 1146 out tokens · 77529 ms · 2026-05-08T16:38:58.381716+00:00 · methodology

discussion (0)

Reference graph

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