{ "model": { "rank": 2626, "code": "thing-q133327", "model_id": "vr.tr.spacetime", "name": "spacetime", "purpose": "Let an agent explain spacetime in special and general relativity, describe curvature, solutions and observable consequences, present speculative topics with clear labelling, and support learning.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.STA", "industry": "", "version": "", "url": "/models/thing/q133327/", "tier": 2, "score": 101, "payload": { "layer": "wikidata", "aliases": [ "Solutions of the Einstein field equations", "monochromatic electromagnetic plane wave", "spacetime frame", "non-relativistic spacetime", "stationary spacetime", "traversable acausal retrograde domains in spacetime", "Malament–Hogarth spacetime", "relativistic disk", "Kerr–Newman–de–Sitter metric", "static spacetime", "Reissner–Nordström–de Sitter metric" ], "aliasCount": 11, "merged": 11, "knownIn": 101, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q133327", "url": "https://www.wikidata.org/wiki/Q133327", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T01:28:50Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 2, "engine": "claude" }, "metaModel": { "id": "THING-Q133327", "registryId": "vr.tr.spacetime", "name": "spacetime", "version": "0.2.0-wave.2", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.STA" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q133327/", "model": { "registry_id": "vr.tr.spacetime", "name": "spacetime", "purpose": "Let an agent explain spacetime in special and general relativity, describe curvature, solutions and observable consequences, present speculative topics with clear labelling, and support learning.", "definition": "The unified four-dimensional continuum of space and time in which events are located, introduced in special relativity and, in general relativity, curved by mass and energy so that gravity is described as spacetime geometry through solutions of the Einstein field equations, including stationary spacetimes, black holes and cosmological models; spacetime is contrasted with non-relativistic space plus absolute time and is studied in physics and philosophy, including speculative topics such as time travel domains.", "what_it_is_for": "The unified continuum of space and time.", "affordances": [ "explain relativistic spacetime", "describe curvature and solutions", "label speculative topics", "support learning" ], "distinguishing_features": [ "Four dimensions", "Lorentz structure", "Curvature", "Field equation solutions" ], "appearance": "Not physical as an object; the arena of events.", "visual_identification": [ "Four-dimensional continuum", "Curved by mass and energy", "Newtonian space and time are separate absolutes" ], "physical_properties": [], "families_and_kinds": [ "Minkowski spacetime of special relativity", "curved spacetimes of general relativity", "stationary and black hole solutions", "cosmological spacetimes", "speculative and exotic spacetimes" ], "related_models": [ { "relation": "is a kind of", "target": "spacetime curvature", "why": "category" }, { "relation": "is related to", "target": "curvature", "why": "geometric curvature" }, { "relation": "is related to", "target": "space", "why": "space as a component" }, { "relation": "is related to", "target": "plasma", "why": "astrophysical contexts" } ], "identifiers": [], "standards_and_regulation": [ "Conventions of relativity and differential geometry", "Scientific standards of evidence for speculative claims" ], "failure_modes_and_hazards": [ "Presenting speculative spacetimes as established", "Confusing coordinate and physical effects", "Popular misconceptions about relativity" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "understand", "name": "Understand", "description": "What spacetime is.", "rationale": "Physics.", "layers": [ { "id": "special", "name": "Special", "description": "Special relativity.", "findings": [ { "id": "special-finding", "name": "Special", "description": "Special relativity.", "questions": [ { "text": "How does special relativity unify space and time into Minkowski spacetime, and what are intervals, light cones and frames?", "kind": "definition" }, { "text": "How does this differ from non-relativistic space and time?", "kind": "definition" } ] } ] }, { "id": "general", "name": "General", "description": "General relativity.", "findings": [ { "id": "general-finding", "name": "General", "description": "General relativity.", "questions": [ { "text": "How does mass and energy curve spacetime, and what do the Einstein field equations describe?", "kind": "definition" }, { "text": "Which entry fits general relativity?", "kind": "action" } ] } ] } ] }, { "id": "solutions", "name": "Solutions", "description": "Solutions and phenomena.", "rationale": "Theory.", "layers": [ { "id": "solutions", "name": "Solutions", "description": "Solutions of the field equations.", "findings": [ { "id": "solutions-finding", "name": "Solutions", "description": "Solutions.", "questions": [ { "text": "What are the Schwarzschild, Kerr, cosmological and plane wave solutions, and what do stationary spacetimes mean?", "kind": "provenance" }, { "text": "Which entry fits a specific solution?", "kind": "action" } ] } ] }, { "id": "observations", "name": "Observations", "description": "Observed consequences.", "findings": [ { "id": "observations-finding", "name": "Observations", "description": "Observations.", "questions": [ { "text": "What observations confirm spacetime curvature, from light bending and time dilation to gravitational waves?", "kind": "provenance" }, { "text": "Which entry fits gravitational waves?", "kind": "action" } ] } ] } ] }, { "id": "speculative", "name": "Speculative", "description": "Speculative topics.", "rationale": "Attribution.", "layers": [ { "id": "exotic", "name": "Exotic", "description": "Exotic spacetimes.", "findings": [ { "id": "exotic-finding", "name": "Exotic", "description": "Exotic.", "questions": [ { "text": "What are wormholes, closed timelike curves and proposed time travel domains, and how do physicists assess them?", "kind": "provenance" }, { "text": "Are speculative ideas clearly labelled as unconfirmed?", "kind": "boundary" } ] } ] }, { "id": "philosophy", "name": "Philosophy", "description": "Philosophy of spacetime.", "findings": [ { "id": "philosophy-finding", "name": "Philosophy", "description": "Philosophy.", "questions": [ { "text": "How do philosophers treat the reality of spacetime, substantivalism and the nature of time, with positions attributed?", "kind": "provenance" }, { "text": "Which entry fits philosophy of physics?", "kind": "action" } ] } ] } ] }, { "id": "learn", "name": "Learn", "description": "History and teaching.", "rationale": "Education.", "layers": [ { "id": "history", "name": "History", "description": "History.", "findings": [ { "id": "history-finding", "name": "History", "description": "History.", "questions": [ { "text": "How did the concept of spacetime develop from Minkowski and Einstein onward?", "kind": "provenance" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] }, { "id": "teach", "name": "Teach", "description": "Teaching.", "findings": [ { "id": "teach-finding", "name": "Teach", "description": "Teaching.", "questions": [ { "text": "How can spacetime be taught with diagrams and analogies while avoiding misconceptions?", "kind": "action" }, { "text": "Which misconceptions arise?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Should each solution be a separate entry?", "How should physics resources be linked?", "How should speculative topics be labelled?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "abstract concept", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a spacetime, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent explain spacetime in special and general relativity, describe curvature, solutions and observable consequences, present speculative topics with clear labelling, and support learning.", "characteristics": { "substance": "abstract", "origin": "conceptual", "agency": "inert" }, "whatYouCanDoWithIt": [ "observed and measured" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: Solutions of the Einstein field equations, monochromatic electromagnetic plane wave, spacetime frame, non-relativistic spacetime, stationary spacetime, traversable acausal retrograde domains in spacetime, Malament–Hogarth spacetime, relativistic disk, Kerr–Newman–de–Sitter metric, static spacetime, Reissner–Nordström–de Sitter metric.", "11 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 101 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a spacetime, and on what evidence are they told apart?" ], "whatItIsMadeOf": "an abstraction with no physical instance", "physicalCharacter": [ "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state" ], "howItIsRecognised": [ "Nothing to see. What is recognised is an instance of it, and which instances count is exactly what is argued about." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "Solutions of the Einstein field equations", "monochromatic electromagnetic plane wave", "spacetime frame", "non-relativistic spacetime", "stationary spacetime", "traversable acausal retrograde domains in spacetime", "Malament–Hogarth spacetime", "relativistic disk", "Kerr–Newman–de–Sitter metric", "static spacetime", "Reissner–Nordström–de Sitter metric" ] } ], "standing": "Described in 101 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 11 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one spacetime from another, and a spacetime from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a spacetime sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a spacetime from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a spacetime passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a spacetime between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a spacetime, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a spacetime is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "definitions-in-contest", "name": "Definitions and who holds them", "description": "What spacetime is taken to mean, and by whom.", "rationale": "When a field disagrees about a concept, the disagreement is the content. A model that picks one definition silently destroys the information.", "layers": [ { "id": "competing-definitions", "name": "Competing definitions", "description": "The main readings and the traditions behind them.", "findings": [ { "id": "definition-map", "name": "Definitions and their holders", "description": "Each definition with the school or body that holds it.", "questions": [ { "id": "definition-map-q01", "text": "Which definitions of spacetime are in use, and which tradition or body holds each?", "kind": "definition" }, { "id": "definition-map-q02", "text": "What turns on the difference between them in practice?", "kind": "boundary" } ] } ] }, { "id": "operationalisation", "name": "Operationalisation", "description": "How it is measured or applied when it has to be.", "findings": [ { "id": "operational-record", "name": "Measures and proxies", "description": "Instruments and indicators used to stand in for it.", "questions": [ { "id": "operational-record-q01", "text": "How is spacetime operationalised or measured in practice, and by what instrument?", "kind": "measurement" }, { "id": "operational-record-q02", "text": "What does that operationalisation leave out, and when does that matter?", "kind": "boundary" } ] } ] } ] }, { "id": "instances-and-use", "name": "Instances, use and consequence", "description": "What counts as an instance of spacetime and what follows from calling something that.", "rationale": "Applying a concept is an act with consequences, so a model must say what the label licenses and what it does not.", "layers": [ { "id": "instances", "name": "What counts as an instance", "description": "Clear cases, borderline cases and non-cases.", "findings": [ { "id": "instance-tests", "name": "Tests for an instance", "description": "What would settle whether something falls under it.", "questions": [ { "id": "instance-tests-q01", "text": "What would settle whether something is an instance of spacetime?", "kind": "boundary" }, { "id": "instance-tests-q02", "text": "Which borderline cases are argued about, and on what grounds?", "kind": "definition" } ] } ] }, { "id": "consequence", "name": "Consequence of application", "description": "Rights, duties or decisions that follow from the label.", "findings": [ { "id": "consequence-record", "name": "What the label licenses", "description": "What an agent may do once something is classified this way.", "questions": [ { "id": "consequence-record-q01", "text": "What follows practically once something is treated as spacetime?", "kind": "action" }, { "id": "consequence-record-q02", "text": "What must an agent not infer from the label alone?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a spacetime came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a spacetime and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a spacetime is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a spacetime, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a spacetime, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a spacetime is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 5, "layers": 10, "findings": 12, "questions": 32 } } } }