{"id":"56753e58-4c53-4b20-bb63-100cee79fbef","arxiv_id":"2607.12485","paper_version":1,"verdict":"CONDITIONAL","confidence":"LOW","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":3,"one_line_summary":"Superradiant boson clouds around spinning asteroid-mass PBHs produce MeV neutrinos that Borexino, KamLAND and Super-K can use to bound f_PBH down to ~10^{-7}.","lead":"Rotating asteroid-mass primordial black holes with boson clouds can emit steady MeV neutrinos via superradiance. Existing antineutrino detectors may then rule out large fractions of that dark-matter window more tightly than microlensing.","discovery_kind":"new_application","skeptic_critique":{"model":"grok-4.5","headline":"Abstract-only review cannot verify the flux-to-f_PBH conversion that underpins the strongest claim; cloud lifetime and monochromatic MeV emission assumptions remain unchecked.","rationale":"The Reader correctly flags the long-lived, steady monochromatic MeV flux assumption as the weakest link and assigns CONDITIONAL / LOW confidence precisely because the full text is unavailable. My stress-test reaches the same conclusion: the numerical bound that constitutes the paper’s strongest claim cannot be audited from the abstract alone. No stronger or different load-bearing flaw is visible; there is no evidence of internal inconsistency, only of missing intermediate steps. Therefore the Reader’s verdict and confidence level remain appropriate; no adjustment is warranted. The concrete test above is the minimal calculation that would settle whether the advertised f_PBH reach is real once the paper becomes accessible.","tokens_in":2140,"tokens_out":662,"duration_ms":5436,"concrete_test":"Once the full paper is available, recompute the differential neutrino flux dΦ/dE for the benchmark point (M_PBH = 2e22 g, â=0.9, α_g=0.25, g_νφ=10^{-4}) using the paper’s stated cloud occupation number, decay rate, and Galactic density profile; fold with Super-Kamiokande / KamLAND / Borexino effective exposures and energy windows. If the resulting 90 % CL f_PBH limit is weaker than ~10^{-5} (or the spectrum is no longer monochromatic in the few-MeV band), the headline claim does not hold.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The strongest claim (f_PBH ~ 10^{-7} near 2e22 g for â=0.9, α_g=0.25, g_νφ=10^{-4}, competitive with microlensing) rests entirely on converting experimental MeV antineutrino flux limits into a PBH abundance bound. That conversion requires: (i) long-lived superradiant scalar clouds around spinning asteroid-mass PBHs, (ii) an approximately steady, nearly monochromatic few-MeV neutrino emission rate set by the Yukawa coupling and gravitational fine-structure constant, and (iii) correct Galactic + extragalactic flux folding. The abstract states these ingredients but supplies no derivation, lifetime estimate, spectrum, or experimental acceptance calculation. Without the full text, it is impossible to confirm that the clouds survive long enough, that the emission remains monochromatic and MeV-scale across the quoted mass window, or that the numerical prefactors yield the advertised 10^{-7} bound rather than a far weaker limit. This is the single load-bearing point: if any of those intermediate steps fails, the claimed competitiveness with microlensing evaporates. No internal contradiction appears in the abstract itself; the concern is purely that the central numerical claim is unverifiable from the available material.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.5","summary":"The manuscript studies rotating asteroid-mass primordial black holes (PBHs) that host superradiantly produced scalar boson clouds. These clouds are assumed to emit an approximately steady, nearly monochromatic neutrino flux in the few-MeV range via a Yukawa coupling g_νφ. The authors compute Galactic and extragalactic fluxes and confront them with existing low-energy antineutrino limits from Borexino, KamLAND, and Super-Kamiokande. For benchmark parameters â = 0.9, α_g = 0.25 and g_νφ = 10^{-4}, they report a bound reaching f_PBH ∼ 10^{-7} near M_PBH ∼ 2 × 10^{22} g, claimed to be competitive with or stronger than microlensing constraints in the same window, and complementary to Hawking-evaporation neutrino bounds on lighter PBHs.","tokens_in":2447,"tokens_out":958,"duration_ms":16100,"significance":"If the flux calculation, cloud-lifetime assumptions, and experimental conversion hold, the work would supply a genuinely complementary probe of the still-open asteroid-mass PBH dark-matter window using existing MeV antineutrino data. Mapping a new channel (superradiant boson clouds → monochromatic neutrinos) onto Borexino/KamLAND/Super-Kamiokande limits is a useful addition to the PBH literature and could meaningfully tighten f_PBH in a mass range where microlensing is weakest. The result is parameter-dependent (spin, α_g, Yukawa), so its ultimate impact hinges on how robustly those inputs are motivated and scanned.","major_comments":[{"comment":"The abstract’s headline bound f_PBH ∼ 10^{-7} rests entirely on converting experimental MeV antineutrino flux limits into a PBH abundance. That conversion requires (i) long-lived superradiant scalar clouds around spinning asteroid-mass PBHs, (ii) an approximately steady, nearly monochromatic few-MeV emission rate controlled by g_νφ and α_g, and (iii) correct Galactic plus extragalactic flux folding with experimental acceptances. Only the abstract is available for this review, so none of these intermediate steps—cloud lifetime estimates, spectrum, monochromaticity across the quoted mass window, or the numerical prefactors that produce 10^{-7}—can be checked. Until the full derivation is examined, the competitiveness with microlensing cannot be confirmed.","section":null},{"comment":"The strongest quoted limit is given for a single optimistic point (â = 0.9, α_g = 0.25, g_νφ = 10^{-4}). The manuscript must show how the bound degrades when these free parameters are varied over theoretically motivated ranges, and must justify why α_g = 0.25 and g_νφ = 10^{-4} are representative rather than fine-tuned. Without that scan, the claim that neutrino searches “strongly constrain a significant part of the asteroid-mass window” remains unquantified.","section":null},{"comment":"The assertion that the neutrino constraints “can be significantly stronger than existing microlensing limits in the same mass range” requires an explicit, apples-to-apples comparison under identical spin and mass assumptions. The abstract states the conclusion but supplies no table or figure of the comparison; this must be demonstrated in the body of the paper before the claim can be accepted.","section":null}],"minor_comments":[{"comment":"The abstract uses both “\\~{a}” and “â” for the dimensionless PBH spin; notation should be standardized.","section":null},{"comment":"The phrase “extend to somewhat larger masses” is vague; a concrete mass range would help the reader.","section":null},{"comment":"It would be useful to state briefly whether vector or other boson spins are considered or deliberately deferred, since the abstract specifies “for scalar bosons.”","section":null}],"recommendation":"uncertain","confidential_remarks":"Only the abstract was supplied for this review (full text marked unavailable). A proper technical assessment of the load-bearing flux-to-f_PBH conversion is therefore impossible. I recommend the editor obtain the complete manuscript before a definitive decision; my present recommendation is “uncertain” solely for that reason. If the full text later confirms long-lived monochromatic MeV emission and the quoted numerical prefactors, the result would be of clear interest to the journal."},"author_rebuttal":null,"desk_editor":{"model":"grok-4.5","letter":"The one thing to know is that this is an abstract-only claim of a new constraint map: MeV neutrinos from superradiant scalar clouds around spinning asteroid-mass PBHs, folded against Borexino/KamLAND/Super-K, can push f_PBH down to ~10^{-7} near 2e22 g for â=0.9, α_g=0.25, g_νφ=10^{-4}, stronger than microlensing in that slice. That combination is the novelty; both pieces (PBH superradiance and neutrino limits on PBHs) already exist separately.\n\nWhat they do well on paper is state the free parameters cleanly and anchor the result to real experimental flux limits rather than inventing a new detector. The abstract is internally consistent: Galactic plus extragalactic fluxes, monochromatic few-MeV emission, comparison to existing antineutrino bounds, and an explicit distinction from Hawking-evaporation neutrino limits on lighter PBHs. If the calculation holds, it is a useful complementary probe of one of the last windows where PBHs could still be all of DM.\n\nThe soft spot is exactly the one the stress-test flags, and it is load-bearing rather than minor. Everything interesting sits on the conversion of those experimental limits into f_PBH. That requires long-lived clouds, a steady nearly monochromatic MeV rate set by the Yukawa and α_g, and correct flux folding. None of that is checkable from the abstract. No lifetime estimate, spectrum, acceptance, or prefactor is given. If any intermediate step fails, the advertised competitiveness with microlensing disappears. Free parameters are labeled as such, so there is no circularity red flag, but without the full text we cannot score soundness above “conditional.”\n\nThis is for people who already work on PBH constraints or light-boson superradiance and want a new handle on the asteroid-mass window. It is not a general-audience cosmology paper. I would send it to a serious referee once the full manuscript is available; the idea is sharp enough to deserve that time even if the numbers get revised. For now I would not cite it or bring it to reading group until we can see the flux calculation. Treat the numerical claim as provisional.","headline":"Abstract-only: potentially useful neutrino bound on asteroid-mass PBHs, but the load-bearing flux-to-f_PBH conversion is unverifiable from what we have.","tokens_in":3092,"tokens_out":572,"would_cite":false,"duration_ms":4466,"reading_group":"no","serious_thinker":"unclear","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.5","headline":"Existing MeV antineutrino limits can exclude a large share of asteroid-mass primordial black holes as dark matter if spinning PBHs host neutrino-emitting boson clouds.","keywords":["primordial black holes","dark matter","superradiance","neutrino flux","asteroid-mass window","Borexino","KamLAND","Super-Kamiokande"],"falsifier":"A tighter upper limit (or a positive detection) on the Galactic MeV antineutrino flux that falls below (or matches) the flux predicted for f_PBH = 1 at the paper’s benchmark point â = 0.9, α_g = 0.25, g_νφ = 10^{-4} would falsify or confirm the corresponding exclusion.","tokens_in":3017,"feed_emoji":"🕳️","tokens_out":997,"duration_ms":20826,"temperature":0.7,"pith_summary":"The paper argues that rotating primordial black holes in the asteroid-mass window can grow long-lived clouds of light bosons by superradiance, and that those clouds can radiate a nearly steady, monochromatic flux of few-MeV neutrinos through a Yukawa coupling. By computing both the Galactic and extragalactic contributions to this flux and confronting them with published Borexino, KamLAND and Super-Kamiokande antineutrino bounds, the authors show that scalar-boson scenarios already rule out a substantial fraction of the parameter space in which PBHs could still constitute all of the dark matter. For rapidly spinning holes the exclusion can reach dark-matter fractions as low as about 10^{-7} near 2×10^{22} g, exceeding current microlensing limits in the same mass range. The result supplies a neutrino-based probe that is complementary to earlier constraints that rely on Hawking evaporation from lighter PBHs.","feed_headline":"Neutrino limits push asteroid-mass PBH dark matter to 10^{-7}","feed_subtitle":"Borexino, KamLAND and Super-K constrain boson clouds around spinning primordial black holes more tightly than microlensing.","key_machinery":"The long-lived superradiant boson cloud that forms around a spinning PBH and subsequently decays into neutrinos via a Yukawa interaction, yielding a steady, nearly monochromatic MeV flux controlled by the gravitational fine-structure constant α_g and the coupling g_νφ.","core_discovery":"Rotating asteroid-mass primordial black holes surrounded by superradiant scalar boson clouds produce a nearly monochromatic MeV neutrino flux whose Galactic plus extragalactic intensity, when compared with existing Borexino, KamLAND and Super-Kamiokande limits, excludes a large part of the remaining PBH dark-matter window, reaching f_PBH ∼ 10^{-7} for high spin and moderate couplings.","pith_inferences":["Improved low-energy neutrino observatories could push the exclusion well below f_PBH ∼ 10^{-7} or cover a wider range of spins and couplings.","If the boson is a vector rather than a scalar, cloud occupation and neutrino emission rates would change, altering the reach of the same experimental limits.","A directional search for a monochromatic MeV excess toward the Galactic Center would test the same cloud-emission mechanism without assuming a full dark-matter fraction.","Additional couplings of the same boson could open simultaneous photon or gravitational-wave channels that would cross-check the neutrino bounds."],"forward_implications":["A large fraction of the asteroid-mass window is already excluded as all of dark matter for scalar bosons under the stated assumptions.","The neutrino bounds extend to somewhat higher PBH masses than the classic 10^{17}–10^{23} g range.","For â = 0.9 and α_g = 0.25 the strongest bound reaches f_PBH ∼ 10^{-7} near 2 × 10^{22} g when g_νφ = 10^{-4}.","These limits can be stronger than existing microlensing constraints in the same mass interval.","The method provides a complementary neutrino probe distinct from Hawking-evaporation searches that target lighter PBHs."],"fun_headline_variants":["Neutrino flux bounds spinning PBHs to f_PBH ~ 10^{-7}","Borexino KamLAND Super-K limit asteroid-mass PBH dark matter","Superradiant boson clouds yield MeV neutrinos constraining PBHs","Galactic and extragalactic neutrino limits on rotating PBH DM","Scalar clouds around high-spin PBHs exclude large DM fraction"],"cache_read_input_tokens":2304,"weakest_assumption_plain":"Spinning asteroid-mass primordial black holes form long-lived superradiant boson clouds that emit a steady, nearly monochromatic MeV neutrino flux at a rate fixed by the assumed Yukawa coupling and gravitational fine-structure constant.","fun_headline_variants_meta":{"raw":{"variants":["Neutrino flux bounds spinning PBHs to f_PBH ~ 10^{-7}","Borexino KamLAND Super-K limit asteroid-mass PBH dark matter","Superradiant boson clouds yield MeV neutrinos constraining PBHs","Galactic and extragalactic neutrino limits on rotating PBH DM","Scalar clouds around high-spin PBHs exclude large DM fraction"]},"model":"grok-4.5","effort":"low","cost_usd":0.004826,"raw_usage":{"total_tokens":1455,"prompt_tokens":880,"num_sources_used":0,"completion_tokens":101,"cost_in_usd_ticks":48260000,"prompt_tokens_details":{"text_tokens":880,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":474,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":880,"tokens_out":101,"duration_ms":5352,"temperature":1.0,"reasoning_tokens":474,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-07-15T05:43:43.366123+00:00","model_set":{"reader":"grok-4.5"},"falsifier":"A tighter upper limit (or a positive detection) on the Galactic MeV antineutrino flux that falls below (or matches) the flux predicted for f_PBH = 1 at the paper’s benchmark point â = 0.9, α_g = 0.25, g_νφ = 10^{-4} would falsify or confirm the corresponding exclusion.","supporting_citations":[],"review_version":1}