Prior art: computational cost of unitary evolution → objective collapse / decoherence floor
Thread: T3
Date: 2026-09-14
Question: Has anyone published: a simulated universe cannot afford full unitary entanglement growth, therefore the simulator must discard information, therefore we should expect objective collapse (GRW/CSL/Diósi–Penrose) or an anomalous decoherence floor as an observable signature?
Evidence classes used below: Established / Serious speculation / Anomaly / Anecdote / This scout’s inference.
Verdict
The specific argument has not been found in print. No paper, arXiv preprint, or serious blog post was located that (i) starts from the exponential cost of tracking unitary entanglement, (ii) infers that a simulator must discard unobserved quantum information, and (iii) predicts GRW/CSL/DP-style observer-independent collapse or a universal decoherence floor as the signature.
That is “I did not find it in the places listed,” not “it is new.” Adjacent arguments exist and are easy to confuse with it. They are not it.
Closest published cousins are lazy rendering / fill-in-on-observation (Bostrom; Campbell–Owhadi) and finite information production rate vs MWI (Gisin 2026). Those predict observer-triggered or information-bounded collapse analogues, not GRW/CSL.
The target argument vs what exists
| Claim |
Found? |
| Simulator skips unobserved classical/microscopic detail (compression, foveation) |
Yes — Bostrom 2003 §III; Campbell/Owhadi 2017 |
| MWI is computationally wasteful, so a finite simulator would not run it |
Yes — Owhadi et al. 2017 (explicit) |
| Finite node capacity → collapse as “overload/reboot” |
Yes — Whitworth 2011 (digital-physics VR, not GRW) |
| Finite info-production rate → Nature cannot branch/entangle without bound; MWI falsified; QC/decoherence affected |
Yes — Gisin 2026; not a simulation argument |
| Cost of unitary evolution → GRW/CSL/DP or a universal decoherence floor as sim signature |
Not found |
| Collapse models as evidence against simulation |
Not found |
| Quantum complexity / QC speedup as evidence against (classical) simulation |
Yes — popularization of Ringel–Kovrizhin; Aaronson rebuts |
Bostrom 2003 — exact quotes (Established)
Nick Bostrom, “Are You Living in a Computer Simulation?” Philosophical Quarterly 53(211): 243–255 (2003). HTML: https://simulation-argument.com/simulation/ PDF: https://simulation-argument.com/simulation.pdf
Journal pagination is 243–255; the quotes sit in §III (The Technological Limits of Computation). HTML has no page breaks; they are the late-§III compression paragraphs (commonly cited around pp. 246–247 of the journal).
On full quantum simulation vs lazy fill-in:
“Simulating the entire universe down to the quantum level is obviously infeasible, unless radically new physics is discovered. But in order to get a realistic simulation of human experience, much less is needed — only whatever is required to ensure that the simulated humans, interacting in normal human ways with their simulated environment, don’t notice any irregularities. […] On the surface of Earth, macroscopic objects in inhabited areas may need to be continuously simulated, but microscopic phenomena could likely be filled in ad hoc.”
On observation-triggered detail (the requested quote):
“Moreover, a posthuman simulator would have enough computing power to keep track of the detailed belief-states in all human brains at all times. Therefore, when it saw that a human was about to make an observation of the microscopic world, it could fill in sufficient detail in the simulation in the appropriate domain on an as-needed basis. Should any error occur, the director could easily edit the states of any brains that have become aware of an anomaly before it spoils the simulation. Alternatively, the director could skip back a few seconds and rerun the simulation in a way that avoids the problem.”
This is not the target argument. Bostrom’s shortcut is lazy evaluation + brain-edit/rollback, not a physical collapse law. He does not mention GRW, CSL, DP, or a decoherence floor. Inconsistency is patched by cheating the observers, not by discarding entanglement as a dynamical rule.
Closest published cousins (not the target)
1. Owhadi, Sauvageau, Watkinson 2017 — finite resources → render on observation (Serious speculation)
Houman Owhadi, Joe Sauvageau, David Watkinson, “On testing the simulation theory,” arXiv:1703.00058 [quant-ph] (2017); also Int. J. Quantum Foundations 3 (2017) 78–99. https://arxiv.org/abs/1703.00058 https://users.cms.caltech.edu/~owhadi/index_htm_files/IJQF2017.pdf
Core assumption: finite simulator uses computational-complexity minimization.
“to achieve low computational complexity, such a system would, as in a video game, render content (reality) only at the moment that information becomes available for observation by a player and not at the moment of detection by a machine”
On MWI:
“The many worlds theory is incredibly inefficient from a computational complexity perspective.”
They identify collapse with Von Neumann–Wigner / player rendering, not GRW. Tests are delayed-choice / which-way “moment of rendering” experiments (Tom Campbell lineage). Observer-triggered, not objective.
Tom Campbell, My Big TOE (2003) and later talks: same rendering-on-demand claim, popular/fringe. Not GRW.
2. Whitworth — collapse as finite-capacity overload (Serious speculation / fringe)
Brian Whitworth, “The Physical World as a Virtual Reality,” arXiv:0801.0337 (2008); “The Virtual Reality Conjecture,” arXiv:1110.3307, Prespacetime 2(9) 1404–1433 (2011). https://arxiv.org/abs/1110.3307
From 1110.3307: a photon arrives as a “cloud” of program packets; detector nodes have finite capacity, overload and reboot — that is collapse. Also: “Quantum collapse is the irreversible event that gives time its direction” (1011.5499). Digital-physics VR (universe is processing), not a Bostrom ancestor-sim, and not GRW/CSL parameters.
3. Gisin 2026 — finite bit-creation rate vs exponential entanglement (Serious speculation; not simulation)
Nicolas Gisin, “From Quantum Cryptography to Intuitionism and beyond,” arXiv:2609.07127 [quant-ph], 7 Sep 2026. https://arxiv.org/abs/2609.07127
He posits a maximum (\bar g) new bits per unit time and volume. Classically chaotic quantum systems produce “enormous amount of entanglement.” If Nature cannot produce arbitrarily much new information in finite time, MWI is threatened:
“If my very sketchy proposal turns out productive, then the many-worlds interpretation would be falsified.”
On QC:
“If it requires lengthy time to produce the kind of entanglement needed for efficient quantum computations, then decoherence might be even more damaging than usually thought.”
Closest structural cousin (cost of entanglement → something must prune the wavefunction). It is about this physics, not a simulator, and he does not name GRW/CSL as the mechanism.
Earlier Gisin FIQ papers (e.g. arXiv:1701.08300 “Collapse. What else?”) argue collapse is needed; not simulation.
4. Informal / anecdote only
- LessWrong comment on Eliezer Yudkowsky, “Collapse Postulates” (https://www.lesswrong.com/posts/xsZnufn3cQw7tJeQ3/collapse-postulates): joke that collapse exists because “keeping track of all these wave forms quickly becomes computationally intractable, even on the machine that’s simulating our universe.” This is the target sentence — as a joke, not a paper.
- Reddit r/Vive (2016): wavefunction collapse as foveated rendering. Observer-relative, not GRW. https://www.reddit.com/r/Vive/comments/53243g/
- Medium posts (e.g. Soulthreader 2024–25): collapse as “computational efficiency.” No GRW, no calculation.
5. Named authors checked — not the target
| Author |
What they actually say |
Class |
| Seth Lloyd, quant-ph/0110141 |
Universe is a quantum computer; capacity bounds. Opposite of “can’t afford unitary QM.” |
Established |
| Paola Zizzi, gr-qc/0304032 |
Spacetime as quantum computer. Not collapse-from-cost. |
Serious speculation |
| Beane, Davoudi, Savage, arXiv:1210.1847 / EPJA 50:148 (2014) |
Lattice artifacts in cosmic rays if we are a QCD-like sim. Resource lattice, not collapse. |
Serious speculation |
| Ringel & Kovrizhin, Sci. Adv. 3:e1701758 (2017) |
Sign-problem obstruction to local sign-free QMC. Popular press: “not a simulation.” |
Established paper; overclaimed popularization |
| Scott Aaronson, Shtetl-Optimized 2017-10-03, https://scottaaronson.blog/?p=3482 |
Ringel–Kovrizhin does not falsify simulation: (1) only QMC, (2) BPP≠BQP unproven, (3) simulate on a quantum computer, (4) God can spend exponential time. Simulation remains unfalsifiable. |
Established (blog, expert) |
| Aaronson, https://scottaaronson.blog/?p=3208 (2017-03-22) |
Blame simulation for being unfalsifiable, not falsified. Observable universe ~10^122 qubits; classically simulable in ~2^{10^122} steps. Prefer 2-norm over 1-norm. |
Established (blog) |
| Sabine Hossenfelder, 2021-02-18, http://backreaction.blogspot.com/2021/02/the-simulation-hypothesis-is.html |
Bostrom must assume compression of unobserved regions; “You cannot in general just throw away physical processes on short distances.” Quantum computers don’t currently encode GR. Compression is the hole, not a GRW prediction. |
Serious speculation / critique |
| Melvin Vopson, AIP Advances 13:105308 (2023), doi:10.1063/5.0173278 |
2nd law of infodynamics → information minimization as sim evidence. Not collapse. |
Serious speculation (controversial) |
| David Wolpert, arXiv:2404.16050 (2024–2026) |
CS theory of (self-)simulation; Rice, Kleene, PCT. No collapse. |
Established/serious |
| Neukart et al., arXiv:2212.04921 (2022) |
Nested sims halt on resource exhaustion. Not GRW. |
Serious speculation |
| Ross Rhodes, “A Cybernetic Interpretation of Quantum Mechanics” |
Observation-collapse as computer rendering. Informal/fringe; not GRW. |
Anecdote / fringe |
| Ken Wharton, Antony Valentini, Marcelo Gleiser |
Retrocausality / nonequilibrium / public QM writing. No hit on this argument. |
— |
| Zizzi, Lloyd |
Universe is the computer. |
Opposite direction |
The converse (asked)
Has anyone argued collapse models are evidence against simulation? Not found.
Has anyone argued QC speedup is evidence against simulation? Yes, in popularization, not as a clean theorem.
- Ringel–Kovrizhin 2017 + press (“Quantum Weirdness … We’re Not Living in a Computer Simulation,” ScienceAlert, etc.): some quantum systems cannot be efficiently classically Monte-Carlo’d.
- Aaronson (2017-10-03): four independent fatal gaps; a quantum simulator, or exponential classical time, still works.
- Informal “QC is too expensive for a simulator”: same gap. If Nature implements BQP, a classical host pays exponential cost; a quantum host does not. Aaronson and Lloyd both treat quantum simulation of quantum physics as the natural option.
If anything, objective collapse would make a classical simulation cheaper (This scout’s inference). The unpublished target argument is the interesting one because it would turn that cost into a prediction, not a converse-falsification.
Deutsch-side remark (not simulation): MWI is “economical with postulates although extravagant with universes” (standard MWI slogan; Physics World recap of Deutsch). Computational extravagance of MWI is used by Owhadi against MWI-in-a-sim, not to derive GRW.
2024–2026 / live X
- Wolpert arXiv:2404.16050 — CS theory, no collapse.
- Gisin arXiv:2609.07127 (7 Sep 2026) — closest physics cousin, not sim.
- arXiv:2504.08461 astrophysical constraints on simulation — not collapse.
- No arXiv hit for (
"simulation hypothesis" AND (GRW OR CSL OR "objective collapse")).
- Phrase
"decoherence floor" + simulation/GRW: zero hits.
- X sweep 2025-09-01 → 2026-09-14: no posts tying sim computational cost to GRW/CSL as a necessary fix.
Where I looked (so “not found” is scoped)
- Web search: simulation+collapse+computational cost;
"objective collapse"+simulation; "resource"+"objective collapse"; "information cost"+decoherence; "decoherence floor"; "computationally intractable"+collapse+simulation.
- arXiv via web: quant-ph / gr-qc / physics.hist-ph queries on simulation hypothesis + collapse / GRW / CSL / computational resource.
- Named authors listed in the brief, plus Hossenfelder, Wolpert, Ringel–Kovrizhin, Gisin.
- Bostrom 2003 HTML/PDF; Owhadi 1703.00058 HTML; Aaronson two posts; Hossenfelder 2021 transcript.
- X (xAI search) last 12 months.
- Informal: LessWrong, Reddit, Medium.
Not exhaustively searched: paywalled journals beyond abstracts, Campbell’s full MBT volumes, all FQXi essays, all PhilPapers, non-English literature.
Precision, not novelty
Did not find the specific argument in the corpus above.
Do not conclude it is new — only that it is unpublished in the obvious physics/philosophy/arXiv/blog places, and that the nearest published objects are lazy rendering (Bostrom, Campbell/Owhadi) and finite information vs MWI (Gisin), neither of which is GRW/CSL-as-sim-signature.
If Argus wants a claim of the form “a simulator cannot afford unitary entanglement, therefore expect CSL/DP,” that claim appears, on this sweep, to still be open as a formulation, not as a demonstrated absence from all of print.
View exactly as delivered (raw text)
# Prior art: computational cost of unitary evolution → objective collapse / decoherence floor
**Thread:** T3
**Date:** 2026-09-14
**Question:** Has anyone published: a simulated universe cannot afford full unitary entanglement growth, therefore the simulator must discard information, therefore we should expect *objective* collapse (GRW/CSL/Diósi–Penrose) or an anomalous decoherence floor as an observable signature?
**Evidence classes used below:** Established / Serious speculation / Anomaly / Anecdote / This scout’s inference.
---
## Verdict
**The specific argument has not been found in print.** No paper, arXiv preprint, or serious blog post was located that (i) starts from the exponential cost of tracking unitary entanglement, (ii) infers that a simulator must *discard* unobserved quantum information, and (iii) predicts GRW/CSL/DP-style *observer-independent* collapse or a universal decoherence floor as the signature.
That is **“I did not find it in the places listed,” not “it is new.”** Adjacent arguments exist and are easy to confuse with it. They are not it.
Closest published cousins are **lazy rendering / fill-in-on-observation** (Bostrom; Campbell–Owhadi) and **finite information production rate vs MWI** (Gisin 2026). Those predict *observer-triggered* or *information-bounded* collapse analogues, not GRW/CSL.
---
## The target argument vs what exists
| Claim | Found? |
|---|---|
| Simulator skips unobserved *classical/microscopic* detail (compression, foveation) | Yes — Bostrom 2003 §III; Campbell/Owhadi 2017 |
| MWI is computationally wasteful, so a finite simulator would not run it | Yes — Owhadi et al. 2017 (explicit) |
| Finite node capacity → collapse as “overload/reboot” | Yes — Whitworth 2011 (digital-physics VR, not GRW) |
| Finite info-production rate → Nature cannot branch/entangle without bound; MWI falsified; QC/decoherence affected | Yes — Gisin 2026; **not** a simulation argument |
| Cost of unitary evolution → **GRW/CSL/DP** or a **universal decoherence floor** as sim signature | **Not found** |
| Collapse models as evidence *against* simulation | **Not found** |
| Quantum complexity / QC speedup as evidence *against* (classical) simulation | Yes — popularization of Ringel–Kovrizhin; Aaronson rebuts |
---
## Bostrom 2003 — exact quotes (Established)
Nick Bostrom, “Are You Living in a Computer Simulation?” *Philosophical Quarterly* 53(211): 243–255 (2003). HTML: https://simulation-argument.com/simulation/ PDF: https://simulation-argument.com/simulation.pdf
Journal pagination is 243–255; the quotes sit in **§III (The Technological Limits of Computation)**. HTML has no page breaks; they are the late-§III compression paragraphs (commonly cited around pp. 246–247 of the journal).
On full quantum simulation vs lazy fill-in:
> “Simulating the entire universe down to the quantum level is obviously infeasible, unless radically new physics is discovered. But in order to get a realistic simulation of human experience, much less is needed — only whatever is required to ensure that the simulated humans, interacting in normal human ways with their simulated environment, don’t notice any irregularities. […] On the surface of Earth, macroscopic objects in inhabited areas may need to be continuously simulated, but microscopic phenomena could likely be filled in ad hoc.”
On observation-triggered detail (the requested quote):
> “Moreover, a posthuman simulator would have enough computing power to keep track of the detailed belief-states in all human brains at all times. Therefore, when it saw that a human was about to make an observation of the microscopic world, it could fill in sufficient detail in the simulation in the appropriate domain on an as-needed basis. Should any error occur, the director could easily edit the states of any brains that have become aware of an anomaly before it spoils the simulation. Alternatively, the director could skip back a few seconds and rerun the simulation in a way that avoids the problem.”
**This is not the target argument.** Bostrom’s shortcut is *lazy evaluation + brain-edit/rollback*, not a physical collapse law. He does not mention GRW, CSL, DP, or a decoherence floor. Inconsistency is patched by cheating the observers, not by discarding entanglement as a dynamical rule.
---
## Closest published cousins (not the target)
### 1. Owhadi, Sauvageau, Watkinson 2017 — finite resources → render on observation (Serious speculation)
Houman Owhadi, Joe Sauvageau, David Watkinson, “On testing the simulation theory,” arXiv:1703.00058 [quant-ph] (2017); also *Int. J. Quantum Foundations* 3 (2017) 78–99. https://arxiv.org/abs/1703.00058 https://users.cms.caltech.edu/~owhadi/index_htm_files/IJQF2017.pdf
Core assumption: finite simulator uses computational-complexity minimization.
> “to achieve low computational complexity, such a system would, as in a video game, render content (reality) only at the moment that information becomes available for observation by a player and not at the moment of detection by a machine”
On MWI:
> “The many worlds theory is incredibly inefficient from a computational complexity perspective.”
They identify collapse with **Von Neumann–Wigner / player rendering**, not GRW. Tests are delayed-choice / which-way “moment of rendering” experiments (Tom Campbell lineage). **Observer-triggered, not objective.**
Tom Campbell, *My Big TOE* (2003) and later talks: same rendering-on-demand claim, popular/fringe. Not GRW.
### 2. Whitworth — collapse as finite-capacity overload (Serious speculation / fringe)
Brian Whitworth, “The Physical World as a Virtual Reality,” arXiv:0801.0337 (2008); “The Virtual Reality Conjecture,” arXiv:1110.3307, *Prespacetime* 2(9) 1404–1433 (2011). https://arxiv.org/abs/1110.3307
From 1110.3307: a photon arrives as a “cloud” of program packets; detector nodes have **finite capacity**, **overload and reboot** — that *is* collapse. Also: “Quantum collapse is the irreversible event that gives time its direction” (1011.5499). Digital-physics VR (universe *is* processing), not a Bostrom ancestor-sim, and not GRW/CSL parameters.
### 3. Gisin 2026 — finite bit-creation rate vs exponential entanglement (Serious speculation; **not simulation**)
Nicolas Gisin, “From Quantum Cryptography to Intuitionism and beyond,” arXiv:2609.07127 [quant-ph], 7 Sep 2026. https://arxiv.org/abs/2609.07127
He posits a maximum \(\bar g\) new bits per unit time and volume. Classically chaotic quantum systems produce “enormous amount of entanglement.” If Nature cannot produce arbitrarily much new information in finite time, MWI is threatened:
> “If my very sketchy proposal turns out productive, then the many-worlds interpretation would be falsified.”
On QC:
> “If it requires lengthy time to produce the kind of entanglement needed for efficient quantum computations, then decoherence might be even more damaging than usually thought.”
**Closest structural cousin** (cost of entanglement → something must prune the wavefunction). It is about *this* physics, not a simulator, and he does not name GRW/CSL as the mechanism.
Earlier Gisin FIQ papers (e.g. arXiv:1701.08300 “Collapse. What else?”) argue collapse is needed; not simulation.
### 4. Informal / anecdote only
- LessWrong comment on Eliezer Yudkowsky, “Collapse Postulates” (https://www.lesswrong.com/posts/xsZnufn3cQw7tJeQ3/collapse-postulates): joke that collapse exists because “keeping track of all these wave forms quickly becomes computationally intractable, even on the machine that’s simulating our universe.” **This is the target sentence — as a joke, not a paper.**
- Reddit r/Vive (2016): wavefunction collapse as foveated rendering. Observer-relative, not GRW. https://www.reddit.com/r/Vive/comments/53243g/
- Medium posts (e.g. Soulthreader 2024–25): collapse as “computational efficiency.” No GRW, no calculation.
### 5. Named authors checked — not the target
| Author | What they actually say | Class |
|---|---|---|
| Seth Lloyd, quant-ph/0110141 | Universe *is* a quantum computer; capacity bounds. Opposite of “can’t afford unitary QM.” | Established |
| Paola Zizzi, gr-qc/0304032 | Spacetime as quantum computer. Not collapse-from-cost. | Serious speculation |
| Beane, Davoudi, Savage, arXiv:1210.1847 / *EPJA* 50:148 (2014) | Lattice artifacts in cosmic rays if we are a QCD-like sim. Resource *lattice*, not collapse. | Serious speculation |
| Ringel & Kovrizhin, *Sci. Adv.* 3:e1701758 (2017) | Sign-problem obstruction to local sign-free QMC. Popular press: “not a simulation.” | Established paper; overclaimed popularization |
| Scott Aaronson, Shtetl-Optimized 2017-10-03, https://scottaaronson.blog/?p=3482 | Ringel–Kovrizhin does **not** falsify simulation: (1) only QMC, (2) BPP≠BQP unproven, (3) **simulate on a quantum computer**, (4) God can spend exponential time. Simulation remains unfalsifiable. | Established (blog, expert) |
| Aaronson, https://scottaaronson.blog/?p=3208 (2017-03-22) | Blame simulation for being unfalsifiable, not falsified. Observable universe ~10^122 qubits; classically simulable in ~2^{10^122} steps. Prefer 2-norm over 1-norm. | Established (blog) |
| Sabine Hossenfelder, 2021-02-18, http://backreaction.blogspot.com/2021/02/the-simulation-hypothesis-is.html | Bostrom *must* assume compression of unobserved regions; “You cannot in general just throw away physical processes on short distances.” Quantum computers don’t currently encode GR. Compression is the hole, not a GRW prediction. | Serious speculation / critique |
| Melvin Vopson, *AIP Advances* 13:105308 (2023), doi:10.1063/5.0173278 | 2nd law of infodynamics → information minimization as sim evidence. Not collapse. | Serious speculation (controversial) |
| David Wolpert, arXiv:2404.16050 (2024–2026) | CS theory of (self-)simulation; Rice, Kleene, PCT. No collapse. | Established/serious |
| Neukart et al., arXiv:2212.04921 (2022) | Nested sims halt on resource exhaustion. Not GRW. | Serious speculation |
| Ross Rhodes, “A Cybernetic Interpretation of Quantum Mechanics” | Observation-collapse as computer rendering. Informal/fringe; not GRW. | Anecdote / fringe |
| Ken Wharton, Antony Valentini, Marcelo Gleiser | Retrocausality / nonequilibrium / public QM writing. **No hit** on this argument. | — |
| Zizzi, Lloyd | Universe *is* the computer. | Opposite direction |
---
## The converse (asked)
**Has anyone argued collapse models are evidence *against* simulation?** Not found.
**Has anyone argued QC speedup is evidence against simulation?** Yes, in popularization, not as a clean theorem.
- Ringel–Kovrizhin 2017 + press (“Quantum Weirdness … We’re Not Living in a Computer Simulation,” ScienceAlert, etc.): some quantum systems cannot be efficiently classically Monte-Carlo’d.
- Aaronson (2017-10-03): four independent fatal gaps; a **quantum** simulator, or exponential classical time, still works.
- Informal “QC is too expensive for a simulator”: same gap. If Nature implements BQP, a *classical* host pays exponential cost; a *quantum* host does not. Aaronson and Lloyd both treat quantum simulation of quantum physics as the natural option.
If anything, **objective collapse would make a classical simulation cheaper** (This scout’s inference). The unpublished target argument is the interesting one because it would turn that cost into a *prediction*, not a converse-falsification.
Deutsch-side remark (not simulation): MWI is “economical with postulates although extravagant with universes” (standard MWI slogan; Physics World recap of Deutsch). Computational *extravagance* of MWI is used by Owhadi against MWI-in-a-sim, not to derive GRW.
---
## 2024–2026 / live X
- Wolpert arXiv:2404.16050 — CS theory, no collapse.
- Gisin arXiv:2609.07127 (7 Sep 2026) — closest *physics* cousin, not sim.
- arXiv:2504.08461 astrophysical constraints on simulation — not collapse.
- No arXiv hit for (`"simulation hypothesis"` AND (GRW OR CSL OR `"objective collapse"`)).
- Phrase `"decoherence floor"` + simulation/GRW: **zero hits**.
- X sweep 2025-09-01 → 2026-09-14: **no posts** tying sim computational cost to GRW/CSL as a necessary fix.
---
## Where I looked (so “not found” is scoped)
- Web search: simulation+collapse+computational cost; `"objective collapse"`+simulation; `"resource"`+`"objective collapse"`; `"information cost"`+decoherence; `"decoherence floor"`; `"computationally intractable"`+collapse+simulation.
- arXiv via web: quant-ph / gr-qc / physics.hist-ph queries on simulation hypothesis + collapse / GRW / CSL / computational resource.
- Named authors listed in the brief, plus Hossenfelder, Wolpert, Ringel–Kovrizhin, Gisin.
- Bostrom 2003 HTML/PDF; Owhadi 1703.00058 HTML; Aaronson two posts; Hossenfelder 2021 transcript.
- X (xAI search) last 12 months.
- Informal: LessWrong, Reddit, Medium.
**Not exhaustively searched:** paywalled journals beyond abstracts, Campbell’s full *MBT* volumes, all FQXi essays, all PhilPapers, non-English literature.
---
## Precision, not novelty
**Did not find** the specific argument in the corpus above.
**Do not conclude it is new** — only that it is unpublished in the obvious physics/philosophy/arXiv/blog places, and that the nearest published objects are *lazy rendering* (Bostrom, Campbell/Owhadi) and *finite information vs MWI* (Gisin), neither of which is GRW/CSL-as-sim-signature.
If Argus wants a claim of the form “a simulator cannot afford unitary entanglement, therefore expect CSL/DP,” that claim appears, on this sweep, to still be open as a *formulation*, not as a demonstrated absence from all of print.
Argus