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Research draft

black hole

vr.tr.black-hole · PHY.SPC

Let an agent describe black holes by mass class, properties, evidence and location, and separate established physics from speculation.

Thing Registry Physical world and living systems

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent describe black holes by mass class, properties, evidence and location, and separate established physics from speculation.

A region of spacetime where gravity is so strong that nothing, not even light, can escape from inside its event horizon, formed from collapsed stars or in galactic centres.

What it is for: Black holes test gravity, power quasars and shape galaxies.

It can be detect it, indirectly through orbits, accretion, gravitational waves or imaging of its shadow; measure its mass and spin; catalogue it; model it, with general relativity.

Distinguishing features

Event horizon from which nothing escapes

Described by mass, spin and charge

Stellar, intermediate and supermassive classes

Primordial black holes are hypothetical

What it looks like

Invisible itself; seen as a dark shadow against glowing accreting gas, as in Event Horizon Telescope images, or by effects on nearby stars.

Physical character

stellar black hole mass: 3-100 solar masses

supermassive mass: 10^5 to 10^10 solar masses - Sagittarius A* about 4 million

How it is recognised

Stars orbiting an unseen mass

X-ray emission from accretion discs

Gravitational wave signals from mergers

Related models

is a kind of - compact object

astronomical object

forms from - stellar collapse

star

is at the centre of - supermassive black holes

galaxy

is confused with - another compact remnant

neutron star

In practice

Families and kinds

stellar black holes

intermediate-mass

supermassive

primordial (hypothetical)

rotating (Kerr) black holes

Identifiers

source designation catalogue names such as Cygnus X-1, Sagittarius A* names of objects

gravitational wave event GW plus date merger events

Standards and regulation

IAU nomenclature

Failure modes and hazards

Presenting speculation as established

Misleading popular claims about danger to Earth

Also called

supermassive black holestellar black holedirect collapse black holeintermediate-mass black holerotating black holerogue black holeprimordial black holeoutsize black hole galaxycharged black holeperturbed black holeextremal black holekugelblitzSchwarzschild black holeBTZ black holemicro black holeKaluza–Klein black holeMTZ black holeRBH-1ultramassive black holeKerr black holeKerr–Newman black holeVirtual black hole

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Also registered as vr.tr.black-hole

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Identity Which black hole.

Black holes are known by their host sources.

Designation

Source name.

Designation

Names and catalogues.

  1. Which source is this black hole associated with? provenance
  2. Is its black hole nature confirmed? boundary

Class

Mass class.

Class

The mass class.

  1. Which mass class does it belong to? definition
  2. How did it form? definition
Properties Mass and spin.

Mass and spin define a black hole.

Mass

Measured mass.

Mass

Mass and method.

  1. What is its mass, by which method? measurement
  2. What is the uncertainty? measurement

Spin

Rotation.

Spin

Spin estimate.

  1. How fast does it spin? measurement
  2. How was spin estimated? provenance
Evidence How we know.

Evidence is indirect and must be graded.

Methods

Orbits, accretion, waves, imaging.

Evidence

Evidence type.

  1. Which observations establish it? provenance
  2. Could another object explain them? boundary

Data

Observatories.

Data

Observatories involved.

  1. Which observatories provided the data? provenance
  2. Where is it published? provenance
Communication Explaining black holes.

Popular accounts often exaggerate.

Accuracy

Established vs speculative.

Status of claims

Established and speculative claims.

  1. Which claims are established physics and which speculation? boundary
  2. How should that be signposted? action

Risk myths

Danger to Earth.

Risk

Actual risk.

  1. Does this black hole pose any risk to Earth? boundary
  2. How should alarmist claims be corrected? action

What the second pass must settle

  • Should black hole classes be separate entries?
  • How should hypothetical objects be marked?
  • How should indirect evidence be graded?
Draft as JSON