{"id":"98039f67-61af-4cfe-8469-eb5a32fc5c35","arxiv_id":"2606.08614","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":7.0,"correctness_risk":"unknown","formal_verification":"none","parameter_count":0,"one_line_summary":"Experimental acoustic cloning of rigid scatterers in a 2D waveguide is achieved via multidimensional deconvolution to acquire scattering Green's functions followed by real-time holographic reconstruction.","lead":"The paper experimentally demonstrates cloning of acoustic scattering objects by illuminating them with broadband speakers, retrieving scattering Green's functions via multidimensional deconvolution from reverberative data, and then holographically reconstructing a digital twin that scatters waves identically in real time. This approach could enable accurate digital models for acoustic design and faster iteration on metamaterials without repeated physical builds.","discovery_kind":"new_method","skeptic_critique":{"model":"grok-4.3","headline":"Multidimensional deconvolution from closed-aperture reverberant data may not uniquely or artifact-free recover the full scattering Green's functions needed for exact cloning","rationale":"The reader's weakest_assumption directly identifies the step whose failure would falsify the strongest_claim. Because the manuscript supplies no independent validation (numerical ground-truth comparison or cross-validation on unseen incidences), the concern remains load-bearing and the UNVERDICTED verdict is unchanged.","tokens_in":1598,"tokens_out":339,"duration_ms":13833,"concrete_test":"For one of the rigid scatterers, recompute the MDD Green's functions after (a) adding 5% synthetic noise to the recorded data and (b) removing 10% of the receiver channels; then drive the hologram with a new broadband incident field not used in acquisition and measure the mismatch between predicted and directly recorded scattered pressure at an interior point. If the relative error exceeds ~5% in either case, the 'exactly like' claim does not hold under realistic conditions.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim requires that the retrieved scattering Green's functions, when inserted into the real-time holographic feedback loop, produce an outgoing field identical to the physical object for arbitrary incident wavefields. In a 2D waveguide with a finite closed receiver aperture, the MDD operator is formally under-determined for evanescent components and higher-order multiple scattering; any regularization or aperture truncation introduces errors that propagate directly into the hologram. The abstract and experimental description give no quantitative metric (e.g., relative L2 error on scattered pressure for out-of-training incidences) showing that these errors remain negligible.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.3","summary":"The paper claims a two-step experimental method for acoustic cloning of scattering objects in a 2D waveguide: (1) illuminate a physical scatterer with broadband sources inside a closed receiver aperture and retrieve its scattering Green's functions via multidimensional deconvolution of the reverberant recordings; (2) insert those Green's functions into a real-time holographic feedback loop that reproduces the object's scattering response for arbitrary incident fields, including all orders of multiple scattering. The method is demonstrated on several rigid scatterers, with applications suggested for digital twins and metamaterial testing.","tokens_in":1715,"tokens_out":415,"duration_ms":12637,"significance":"If the central claim holds with the stated accuracy, the work would supply a practical route to experimentally validated, real-time digital scattering models that can be modified on the fly, offering a bridge between physical measurements and numerical wave simulations without requiring full-wave inversion or parameter fitting.","major_comments":[{"comment":"Abstract and method description: the assertion that the hologram 'scatters any wavefield in real-time exactly like the original object' is load-bearing for the cloning claim, yet the provided information supplies no quantitative support (e.g., L2-norm error on scattered pressure, phase mismatch, or comparison against direct measurements for out-of-training incidences).","section":"Abstract"},{"comment":"Multidimensional deconvolution step: in a finite closed-aperture geometry the MDD operator is formally under-determined for evanescent components and higher-order multiples; without explicit regularization details, aperture-truncation analysis, or error propagation estimates, it is unclear whether the retrieved Green's functions are sufficiently artifact-free to support the exact-cloning assertion.","section":"Method (MDD retrieval)"}],"minor_comments":[{"comment":"The phrase 'bring it back to life' is colloquial; replace with a more precise description of the holographic reconstruction.","section":"Abstract"}],"recommendation":"major_revision","confidential_remarks":null},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for the constructive feedback on our manuscript. We address each major comment below and will incorporate revisions to provide the requested quantitative support and methodological details.","responses":[{"response":"We agree that the cloning claim requires quantitative backing. The manuscript presents a proof-of-concept demonstration, but we will revise the abstract and add a new subsection in the results with L2-norm errors on scattered pressure, phase mismatch metrics, and direct comparisons for out-of-training incidences to substantiate the real-time holographic reconstruction accuracy.","revision_made":"yes","referee_comment":"[Abstract] Abstract and method description: the assertion that the hologram 'scatters any wavefield in real-time exactly like the original object' is load-bearing for the cloning claim, yet the provided information supplies no quantitative support (e.g., L2-norm error on scattered pressure, phase mismatch, or comparison against direct measurements for out-of-training incidences)."},{"response":"The referee correctly notes the formal under-determination in finite apertures. We will expand the methods section to include the specific regularization scheme employed, aperture-truncation analysis, and error propagation estimates, showing that artifacts remain below the threshold needed for the observed cloning fidelity in our 2D waveguide experiments.","revision_made":"yes","referee_comment":"[Method (MDD retrieval)] Multidimensional deconvolution step: in a finite closed-aperture geometry the MDD operator is formally under-determined for evanescent components and higher-order multiples; without explicit regularization details, aperture-truncation analysis, or error propagation estimates, it is unclear whether the retrieved Green's functions are sufficiently artifact-free to support the exact-cloning assertion."}],"tokens_in":1277,"tokens_out":366,"duration_ms":15296,"standing_objections":[]},"desk_editor":{"model":"grok-4.3","letter":"The core result is an experimental two-step cloning method: illuminate a rigid scatterer with broadband sources inside a closed receiver array in a 2D waveguide, recover its scattering Green's functions by multidimensional deconvolution, then feed those into a real-time holographic loop that reproduces the outgoing field. They demonstrate this on several scatterers and note that the feedback captures all interaction orders with low latency.\n\nThe work is new in combining the deconvolution step with the holographic reconstruction for this purpose, and the setup is straightforward enough that the demonstration stands on its own without obvious circularity. The closed-aperture geometry is a practical choice for the waveguide, and the claim that the hologram matches the physical object for the tested cases looks credible from the description.\n\nThe soft spot is the strength of the \"exactly like\" assertion. The stress-test concern about under-determined evanescent components and higher-order scattering in finite-aperture MDD is reasonable; if the paper only shows qualitative matches or in-training incidences without L2 error metrics or out-of-sample wavefield comparisons, the exactness claim rests on unshown controls. That is the main place where more data would strengthen the result.\n\nThis is aimed at researchers in acoustics and metamaterials who need digital scattering models. It is concrete enough to be worth referee time even if revisions are needed on the error analysis.","headline":"The paper shows a working experimental pipeline for acoustic cloning in 2D via MDD plus holographic feedback, but the exact-match claim needs quantitative error checks on arbitrary incidences.","tokens_in":2188,"tokens_out":349,"would_cite":false,"duration_ms":12193,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.3","headline":"Acoustic scattering objects are cloned by retrieving their Green's functions and driving real-time holograms that match the original response.","keywords":["acoustic cloning","scattering Green's functions","multidimensional deconvolution","acoustic holography","digital twin","wave scattering","real-time simulation"],"falsifier":"Measure the scattered pressure field produced by the hologram and by the physical object for the same broadband incident wave; the fields must agree within measurement noise across the receiver array.","tokens_in":2521,"feed_emoji":"🔊","tokens_out":585,"duration_ms":13037,"temperature":0.7,"pith_summary":"The paper shows a two-step experimental method to produce acoustic clones of physical scatterers. Broadband sound sources illuminate the object inside a closed array of receivers, and multidimensional deconvolution extracts the full set of scattering responses. These responses then drive a numerical hologram that interacts with any incoming wave exactly as the real object would. The result is a digital twin that reproduces all multiple-scattering effects at low latency. This enables fully realistic virtual scatterers without needing the physical object present.","feed_headline":"Acoustic scatterers cloned as real-time holograms","feed_subtitle":"Method extracts scattering responses from closed-aperture data then reconstructs objects that match original wave behavior exactly","key_machinery":"Scattering Green's functions retrieved by multidimensional deconvolution, which fully encode the object's wave response and are used to drive the acoustic hologram.","core_discovery":"Scattering objects are cloned by first using multidimensional deconvolution on reverberative data collected within a closed receiver aperture to obtain the object's scattering Green's functions, then using those functions to holographically reconstruct the scatterer so that it scatters any wavefield in real time identically to the original.","pith_inferences":["The same data-driven cloning approach could be tested in three-dimensional open domains where the closed-aperture assumption no longer holds.","Real-time modification of the cloned object's properties would allow rapid acoustic design iterations without physical changes.","The method might extend to other wave types if the deconvolution and hologram steps are adapted to the governing equations."],"forward_implications":["The hologram reproduces every order of multiple scattering between the wavefield and the object in real time.","Digital scattering models become fully realistic and interactive without physical prototypes.","Metamaterial designs can be tested by modifying the numerical hologram instead of fabricating new physical samples.","Any incident wavefield, including those not used in the original measurement, produces identical scattering."],"fun_headline_variants":["Real-time holograms clone acoustic scatterers","Acoustic cloning via deconvolution and holography","Holographic clones from closed-aperture reverberative data","Green's functions holographically clone scatterers"],"cache_read_input_tokens":2112,"weakest_assumption_plain":"Multidimensional deconvolution recovers the object's complete scattering Green's functions from the closed-aperture data without missing information or large artifacts caused by the experimental geometry.","fun_headline_variants_meta":{"raw":{"variants":["Real-time holograms clone acoustic scatterers","Acoustic cloning via deconvolution and holography","Holographic clones from closed-aperture reverberative data","Green's functions holographically clone scatterers"]},"model":"grok-4.3","cost_usd":0.009441,"raw_usage":{"total_tokens":4165,"prompt_tokens":562,"num_sources_used":0,"completion_tokens":52,"cost_in_usd_ticks":94412000,"prompt_tokens_details":{"text_tokens":562,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":3551,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":562,"tokens_out":52,"duration_ms":20700,"temperature":1.0,"reasoning_tokens":3551,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-06-27T17:33:20.951017+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"Measure the scattered pressure field produced by the hologram and by the physical object for the same broadband incident wave; the fields must agree within measurement noise across the receiver array.","supporting_citations":[],"review_version":1}