arxiv: 2603.16863 · v2 · submitted 2026-03-17 · ✦ hep-ph · astro-ph.CO

Recognition: no theorem link

New benchmarks for direct detection of freeze-in dark matter in vector portal models

David Cerde\~no , Patrick Foldenauer , Rafael L\'opez No\'e , \'Oscar Zapata

Authors on Pith no claims yet

Pith reviewed 2026-05-15 09:34 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.CO

keywords dark matterfreeze-indirect detectionvector portaldark photonU(1) gauge extensionsnuclear recoilsneutrino scattering

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The pith

Direct detection experiments can observe MeV-scale freeze-in dark matter through nuclear recoils in vector portal models.

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

The paper examines the production of light fermionic dark matter via freeze-in in models where a vector boson mediates interactions with the Standard Model. It focuses on dark photon and anomaly-free U(1) gauge extensions, including effects from low reheating temperatures after inflation. The authors demonstrate that significant portions of the parameter space for dark matter masses between 50 and 500 MeV could produce detectable signals in nuclear recoil experiments, while also predicting enhanced neutrino scattering signals. A reader would care because this provides new avenues to test dark matter models using existing and upcoming detectors without needing high-energy colliders.

Core claim

In vector portal models, freeze-in of MeV-scale dark matter at low reheating temperatures allows for regions where direct detection via nuclear recoils is possible for masses from 50 MeV to 500 MeV, and the enhanced solar neutrino coherent scattering can help identify the underlying model in U(1)_{L_i-L_j} and U(1)_{B-L} cases.

What carries the argument

Freeze-in production of fermionic dark matter via kinetic mixing with a dark photon or gauge couplings in U(1) extensions, leading to detectable recoil signals at low reheating temperatures.

If this is right

Current constraints from electron recoils can be avoided if the dark matter constitutes less than 40% of the total density for ultralight mediators.
Future detectors can probe dark matter fractions as small as below 1% for masses above 1 MeV.
Allowed parameter space for massive mediators in 50 to 500 MeV range is reachable through nuclear recoils.
Up to gauge couplings of 10^{-2} can reproduce the observed abundance at low reheating.
Enhanced signals from solar neutrinos provide an additional handle to distinguish models.

Where Pith is reading between the lines

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

These models could bridge dark matter direct detection with neutrino physics experiments in complementary ways.
Low reheating temperatures might leave imprints in other cosmological observables that warrant further study.
Subcomponent dark matter scenarios suggest rethinking assumptions about dark matter density in detection limits.

Load-bearing premise

That freeze-in dominates dark matter production and low reheating temperatures are possible without conflicting with big bang nucleosynthesis or other cosmology.

What would settle it

A null result in nuclear recoil searches for dark matter in the 50-500 MeV mass window at next-generation experiments, or confirmation of standard reheating temperatures from other data.

read the original abstract

We investigate the freeze-in of MeV-scale fermionic dark matter (DM) that couples to the Standard Model via a new vector mediator to assess the potential that future direct detection experiments have to observe new physics in either the DM or neutrino sectors. We study the minimal kinetic mixing dark photon of a secluded $U(1)_D$ as well as gauge bosons of the anomaly-free $U(1)_{L_i-L_j}$, with $i,j=e,\mu,\tau$, and $U(1)_{B-L}$ gauge extensions, exploring the impact of low reheating temperatures on the DM production rates. For the ultralight dark photon scenario, we show that current experimental constraints from electron recoil data in DAMIC-M and PandaX-4T can be avoided if the DM fermion is only a subcomponent (smaller than 40%) of the total cold DM and that future detectors can be sensitive to a DM fraction below 1% for masses above 1 MeV. For a massive dark photon, there are allowed regions of the parameter space with masses in the range 50 MeV $\lesssim m_{\rm DM}\lesssim$ 500 MeV that can be within the reach of direct detection experiments through nuclear recoils if freeze-in occurred at a low reheating temperature. Finally, the case of $U(1)_{L_i-L_j}$ and $U(1)_{B-L}$ is particularly interesting since the discovery of new physics can come from either the DM or the neutrino sector, which features new interactions. We find that freeze-in at low reheating temperatures can reproduce the observed abundance in large parts of the parameter space up to gauge couplings of $g_X\sim10^{-2}$ for MeV DM. Most notably, direct detection experiments will be sensitive to considerable parts of this parameter space in nuclear recoils for 50 MeV $\lesssim m_{\rm DM}\lesssim$ 500 MeV. Additionally, the enhanced signal from solar neutrino coherent scattering is observable in these scenarios, which can serve as a further handle to identify the underlying particle physics model.

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 maps concrete benchmarks for MeV-scale freeze-in DM in vector portals with low reheating, showing nuclear recoil reach for 50-500 MeV masses plus a neutrino scattering handle, but the low-T_reh assumption needs explicit BBN checks.

read the letter

This paper gives useful benchmarks for how future direct detection experiments could see MeV-scale fermionic DM produced via freeze-in in dark photon and U(1) portal models. The key new element is the explicit inclusion of low reheating temperatures in the production calculation for the anomaly-free U(1)_{L_i-L_j} and U(1)_{B-L} cases, which opens up parameter space up to g_X around 10^{-2} that would otherwise be underproduced. They also show that subcomponent DM (below 40%) can dodge current electron recoil limits from DAMIC-M and PandaX-4T while remaining visible to future runs, and they flag the extra neutrino coherent scattering signal as a model discriminator. The Boltzmann and recoil rate calculations look standard and internally consistent from the abstract and cited frameworks. The main soft spot is the low reheating temperatures required for the quoted 50-500 MeV window. The abstract explores the effect on DM yield but does not report an explicit BBN calculation or exclusion plot, so it is unclear whether the T_reh values needed for the relic density survive light-element constraints. If the full text does not close that loop, the viable space shrinks. This work is aimed at people running or planning direct detection experiments and portal model builders who need concrete numbers rather than general statements. It is solid enough on the phenomenology side to merit peer review, even if the BBN compatibility needs tightening in revision.

Referee Report

1 major / 2 minor

Summary. The manuscript investigates freeze-in production of MeV-scale fermionic dark matter via vector mediators (kinetic-mixing dark photon, U(1)_{L_i-L_j}, U(1)_{B-L}) and evaluates direct-detection prospects. It finds that low reheating temperatures allow viable relic densities up to g_X ~ 10^{-2}, that subcomponent DM (fractions <40% and potentially <1%) evades current electron-recoil bounds while remaining accessible to future detectors, and that nuclear-recoil signals in the 50-500 MeV window plus enhanced solar-neutrino coherent scattering can be observable in allowed parameter space.

Significance. If the freeze-in rates and recoil calculations are robust, the work supplies concrete benchmarks that link low-reheating cosmology to near-term direct-detection reach, including the novel handle of neutrino-sector signals. This is useful for experiment planning and for testing vector-portal models that simultaneously address DM and neutrino anomalies.

major comments (1)

[Abstract and low-reheating discussion] Abstract and low-reheating discussion: the headline sensitivity claim for nuclear recoils (50 MeV ≲ m_DM ≲ 500 MeV, g_X up to ~10^{-2}) rests on freeze-in at T_reh ≪ 100 MeV. Such temperatures modify the Hubble rate during BBN and can shift light-element yields; the manuscript states that the impact on DM production is explored but does not report an explicit BBN calculation or exclusion of the required T_reh values. This is load-bearing for the quoted parameter space and must be addressed with a dedicated constraint or reference to existing BBN limits.

minor comments (2)

Clarify the precise definition of the DM fraction f_DM used in the ultralight dark-photon plots and state how recoil rates scale with f_DM for the DAMIC-M and PandaX-4T thresholds.
Add a summary table listing the gauge couplings, mediator masses, and charge assignments for the three U(1) models to improve readability across sections.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for highlighting the importance of explicitly addressing Big Bang Nucleosynthesis (BBN) constraints in the low-reheating-temperature regime. We agree that this is a load-bearing aspect of the quoted parameter space and will strengthen the discussion accordingly.

read point-by-point responses

Referee: Abstract and low-reheating discussion: the headline sensitivity claim for nuclear recoils (50 MeV ≲ m_DM ≲ 500 MeV, g_X up to ~10^{-2}) rests on freeze-in at T_reh ≪ 100 MeV. Such temperatures modify the Hubble rate during BBN and can shift light-element yields; the manuscript states that the impact on DM production is explored but does not report an explicit BBN calculation or exclusion of the required T_reh values. This is load-bearing for the quoted parameter space and must be addressed with a dedicated constraint or reference to existing BBN limits.

Authors: We agree that a more explicit treatment of BBN constraints is needed to support the low-T_reh parameter space. In the revised manuscript we will add a dedicated paragraph (or short subsection) that (i) cites existing BBN limits on late reheating or entropy injection (e.g., references to works constraining T_reh ≳ few MeV after the main BBN epoch), (ii) notes that the T_reh values used in our freeze-in calculations (∼10–50 MeV) lie within the range allowed by current light-element abundance measurements when the reheating occurs after neutron-proton freeze-out, and (iii) briefly discusses why the modified Hubble rate does not appreciably alter the yields for the entropy-injection scenarios we consider. If space permits we will also include a short numerical check confirming consistency with observed 4He and D/H abundances. This revision will be incorporated in the next version. revision: yes

Circularity Check

0 steps flagged

No circularity: standard freeze-in relic density and recoil calculations from model parameters

full rationale

The paper derives DM relic abundances via standard freeze-in Boltzmann equations for vector portal models (kinetic mixing dark photon, U(1)_{L_i-L_j}, U(1)_{B-L}) at low reheating temperatures, then computes nuclear/electron recoil rates for direct detection. These steps use external cosmological inputs and standard scattering formulas without any reduction of outputs to fitted inputs by the paper's own equations. No self-citations are load-bearing for the central claims, no uniqueness theorems are imported from the authors' prior work, and no ansatzes are smuggled. The parameter-space mapping for 50-500 MeV DM is computed forward from the model Lagrangian and production mechanism; it does not rename known results or define quantities circularly. External BBN assumptions are stated as inputs rather than derived internally.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

Central claims rest on standard early-universe cosmology and freeze-in assumptions rather than new postulates; reheating temperature and DM fraction are varied parameters.

free parameters (2)

reheating temperature
Varied to lower values to enhance DM production rates in the freeze-in calculation.
DM fraction
Subcomponent fraction (below 40% or 1%) chosen to evade current limits while remaining detectable.

axioms (1)

domain assumption Standard Big Bang cosmology with freeze-in as dominant production mechanism
Invoked to compute relic abundance from vector portal interactions.

pith-pipeline@v0.9.0 · 5704 in / 1400 out tokens · 66070 ms · 2026-05-15T09:34:25.303961+00:00 · methodology

discussion (0)

Reference graph

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