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arxiv: 2512.09971 · v8 · submitted 2025-12-10 · ✦ hep-ph · astro-ph.HE

Finding the 3 neutrino masses using a one-phase ν emission model for SN 1987A

Robert Ehrlich This is my paper

Pith reviewed 2026-05-16 23:45 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.HE
keywords neutrino massesSN 1987AMont Blanc neutrinosone-phase emission modelKATRINsterile neutrinosneutrino arrival times
0
0 comments X

The pith

SN 1987A neutrino data can yield specific values for the three neutrino masses.

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

The paper establishes that the neutrino arrival times recorded from supernova SN 1987A, when interpreted through a one-phase emission model, allow extraction of concrete values for each of the three neutrino masses rather than upper limits alone. Differences in arrival times and energies are attributed to the mass-dependent propagation speeds of the neutrinos from a common brief emission period. Three common assumptions are rejected: that the early Mont Blanc events are unrelated to the supernova, that masses above 1 eV are ruled out by effective-mass limits, and that the observed time spread prevents any mass determination. The fit is further supported by the recent KATRIN finding of no sterile-neutrino signal. A sympathetic reader would care because this turns an existing data set into the first direct measurement of the three masses, addressing a long-standing gap in the Standard Model.

Core claim

By adopting a one-phase neutrino emission model for SN 1987A and retaining the Mont Blanc events as part of the signal, the recorded arrival times and energies of the neutrinos can be fitted to yield definite values for the three individual masses, with the apparent spread in arrival times arising from the different flight times of the massive neutrinos rather than from a prolonged emission phase.

What carries the argument

One-phase neutrino emission model, which assumes neutrinos of all three masses are emitted nearly simultaneously so that observed arrival-time differences are produced by their mass-dependent velocities.

If this is right

  • Specific numerical values for the three neutrino masses follow directly from fitting the SN 1987A arrival times.
  • The absence of a sterile-neutrino signal in KATRIN is required for consistency with the three-mass solution.
  • IceCube observations of future supernovae can test the same mass values through predicted arrival-time patterns.
  • Effective-mass upper limits from other experiments remain compatible once the three distinct masses are allowed.

Where Pith is reading between the lines

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

  • Future supernova neutrino detections could supply rapid, independent mass determinations without new accelerators.
  • The same timing method might be applied to other historical neutrino bursts if emission-phase assumptions can be justified.
  • Cosmological sum-of-masses constraints would have to accommodate the specific values obtained here rather than generic upper bounds.

Load-bearing premise

The spread in neutrino emission times from SN 1987A is small enough that a one-phase model applies and the Mont Blanc events belong to the same supernova.

What would settle it

A positive sterile-neutrino signal in KATRIN data or a clear mismatch between the fitted masses and independent bounds from cosmology or tritium beta decay would falsify the claim.

Figures

Figures reproduced from arXiv: 2512.09971 by Robert Ehrlich.

Figure 1
Figure 1. Figure 1: FIG. 1: Best fit of 37 data points ( [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: The probability from the least squares fit to three [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: 3+3 neutrino mass squared diagram postulated by the [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: Computed temporal electron antineutrino luminos [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
read the original abstract

Neutrino masses remain a significant unsolved problem in physics and their nonzero value proves the Standard Model is incomplete. Currently, the values of the three masses only have upper limits from cosmology and experiments like KATRIN. This paper shows that the SN 1987A neutrino data can remarkably yield values for the three neutrino masses, and not merely upper limits. Although this seemingly preposterous idea was suggested a dozen years ago by the author, here it is demonstrated in a much more convincing manner with many new elements, including a stronger statistical treatment, and a thorough explanation of why the method used to find the three masses from supernova SN 1987A neutrino data really works. The key to finding the three neutrino masses is realizing why three normally accepted assumptions are unjustified, The three rejected assumptions are:(a) the 5-hr early LSD (Mont Blanc) neutrinos are unrelated to SN 1987A, (b) any neutrino masses $m_k>1 eV/c^2$ cannot be reconciled with upper limits on the ``effective mass" from KATRIN and other data, and (c) the spread in neutrino emission times from SN 1987A data is too great for the method to work. A particularly crucial piece of evidence supporting the claim made in the paper's title involves a recent negative KATRIN result finding an absence of sterile neutrinos. This absence of a sterile neutrino signal leads to two tests of the claim based on existing data: one for KATRIN and one for IceCube.

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

4 major / 2 minor

Summary. The paper claims that the three neutrino masses can be extracted from the SN 1987A neutrino arrival-time data by adopting a one-phase emission model, including the 5-hour-early Mont Blanc (LSD) events, and explicitly rejecting three standard assumptions: (a) that the Mont Blanc events are unrelated to SN 1987A, (b) that m_k > 1 eV/c² are incompatible with KATRIN effective-mass limits, and (c) that the emission-time spread is too large for the method to succeed. The masses and an emission start time t0 are obtained by fitting the observed ~10 s arrival spread under the instantaneous-emission hypothesis, with a recent KATRIN sterile-neutrino null result cited as supporting evidence.

Significance. If the central claim were to hold after rigorous validation, the result would be significant because it would convert an existing dataset into the first determination of the three individual neutrino masses rather than upper limits, with direct consequences for the Standard Model and cosmology. The manuscript's emphasis on a stronger statistical treatment and explicit justification for the method is a positive step, but the absence of independent cross-checks or falsifiable predictions limits the immediate impact.

major comments (4)
  1. [model section] The one-phase emission assumption is load-bearing for the mass extraction (abstract and model section). Standard core-collapse simulations predict multi-second emission phases (prompt, accretion, cooling) whose duration would dominate the observed arrival spread and prevent unique mass determination; the manuscript does not provide a quantitative demonstration that the intrinsic emission duration is negligible compared with the ~10 s time-of-flight delays.
  2. [data analysis] The reported masses are obtained by adjusting t0 and the three m_k until the model reproduces the arrival-time spread of the ~20–30 events (including Mont Blanc). This procedure is circular by construction: the masses are not an independent prediction but the output of the fit itself, and no full error propagation or sensitivity analysis to ±1–2 s shifts in individual event times is described.
  3. [assumptions section] Inclusion of the Mont Blanc events 5 hours before the main burst is a key modeling choice (assumptions section). The justification for associating these events with SN 1987A despite the extreme time offset must be compared quantitatively with the standard literature that treats them as unrelated; without such comparison the central claim rests on an ad-hoc data selection.
  4. [discussion] The KATRIN sterile-neutrino null result is invoked as supporting evidence (abstract and discussion). This result constrains a fourth mass eigenstate and does not directly validate the active-neutrino timing fit or the one-phase emission hypothesis; the logical link between the two must be made explicit.
minor comments (2)
  1. Notation for the three masses m_k and the effective mass should be defined consistently to avoid confusion with existing KATRIN and cosmological limits.
  2. [references] Additional references to recent supernova neutrino emission simulations (e.g., multi-phase models) would help readers assess the one-phase assumption.

Simulated Author's Rebuttal

4 responses · 0 unresolved

We thank the referee for the careful and detailed review of our manuscript. We address each major comment point by point below, providing clarifications and committing to revisions where the comments identify areas needing strengthening. Our responses focus on the substance of the concerns while maintaining the data-driven approach of the original analysis.

read point-by-point responses

  1. Referee: The one-phase emission assumption is load-bearing for the mass extraction (abstract and model section). Standard core-collapse simulations predict multi-second emission phases (prompt, accretion, cooling) whose duration would dominate the observed arrival spread and prevent unique mass determination; the manuscript does not provide a quantitative demonstration that the intrinsic emission duration is negligible compared with the ~10 s time-of-flight delays.

    Authors: We agree that a quantitative demonstration is needed to justify the one-phase model against standard multi-phase predictions. The observed ~10 s spread in the selected events is used to constrain the emission duration via fit residuals, and we will add an explicit comparison in the revised model section showing that the best-fit emission window is consistent with being shorter than the dominant simulation timescales for the included data subset. This will include estimates of emission duration from the data and direct numerical comparison to literature simulation results. revision: yes

  2. Referee: The reported masses are obtained by adjusting t0 and the three m_k until the model reproduces the arrival-time spread of the ~20–30 events (including Mont Blanc). This procedure is circular by construction: the masses are not an independent prediction but the output of the fit itself, and no full error propagation or sensitivity analysis to ±1–2 s shifts in individual event times is described.

    Authors: The fitting procedure determines the unique set of m_k and t0 that collapses the observed arrival times to a single emission epoch; it is a parameter estimation, not a circular tautology, because the masses are the output that satisfies the physical constraint of common t0 across events of different energies. We acknowledge the need for full error propagation and sensitivity analysis, and will add both in the revised data analysis section, including Monte Carlo variations of event times by ±1–2 s and propagation of timing uncertainties into the mass values. revision: yes

  3. Referee: Inclusion of the Mont Blanc events 5 hours before the main burst is a key modeling choice (assumptions section). The justification for associating these events with SN 1987A despite the extreme time offset must be compared quantitatively with the standard literature that treats them as unrelated; without such comparison the central claim rests on an ad-hoc data selection.

    Authors: We will expand the assumptions section to include a direct quantitative comparison with the standard literature (e.g., statistical arguments for unrelated events and timing improbability under zero-mass assumptions). The comparison will show how the one-phase model with nonzero masses resolves the 5-hour offset as a time-of-flight effect, with explicit probability calculations contrasting our inclusion against the null hypothesis of unrelated signals. revision: yes

  4. Referee: The KATRIN sterile-neutrino null result is invoked as supporting evidence (abstract and discussion). This result constrains a fourth mass eigenstate and does not directly validate the active-neutrino timing fit or the one-phase emission hypothesis; the logical link between the two must be made explicit.

    Authors: We will revise the discussion to make the logical link explicit: the KATRIN null result for a sterile neutrino confirms the three-active-neutrino framework underlying our mass extraction (no additional states to complicate the timing fit), thereby providing indirect support for the validity of applying the three-mass model to the SN 1987A data. This connection will be stated clearly with reference to the assumed number of eigenstates. revision: yes

Circularity Check

1 steps flagged

Masses obtained by fitting emission times and mass parameters to match observed arrival-time spread

specific steps
  1. fitted input called prediction [Abstract]
    "This paper shows that the SN 1987A neutrino data can remarkably yield values for the three neutrino masses, and not merely upper limits... The key to finding the three neutrino masses is realizing why three normally accepted assumptions are unjustified... (c) the spread in neutrino emission times from SN 1987A data is too great for the method to work."

    The masses are extracted by tuning emission-time parameters and the three m_k values so that mass-dependent time-of-flight delays reproduce the observed arrival-time distribution under the one-phase assumption. This makes the reported masses the fitted parameters by construction, not an independent prediction from the data.

full rationale

The paper's central claim is that SN 1987A data yields specific three-neutrino mass values via a one-phase emission model. This reduces to adjusting emission-time offsets and the three masses until the model reproduces the ~10 s arrival spread (including Mont Blanc events), which the paper itself describes as the method that 'really works' after rejecting the assumption that emission-time spread is too large. No independent first-principles derivation or external constraint fixes the masses; the output is the input fit. Self-citation to the author's prior suggestion reinforces the loop but is secondary to the fitting step.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The claim rests on two ad-hoc modeling choices (single-phase emission and inclusion of Mont Blanc events) plus fitted mass and timing parameters; no new physical entities are introduced.

free parameters (2)
  • three neutrino masses
    Fitted parameters chosen so that differential arrival times match the one-phase emission model.
  • emission start time t0
    Adjusted to align the assumed single burst with the observed detection times.
axioms (2)
  • ad hoc to paper All neutrinos from SN 1987A were emitted in a single short phase
    Invoked to convert observed time spread directly into mass differences.
  • ad hoc to paper The 5-hour-early LSD (Mont Blanc) events belong to SN 1987A
    Explicitly rejects the standard assumption that these events are unrelated.

pith-pipeline@v0.9.0 · 5577 in / 1566 out tokens · 51928 ms · 2026-05-16T23:45:36.479815+00:00 · methodology

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Reference graph

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