Stephen Hawking
person · earth
British theoretical physicist who supplied both the strongest classical result about black hole horizons and the quantum calculation that undermined it. In 1971 he proved that the total horizon area cannot decrease in classical general relativity. In 1974 he showed that once quantum fields are included the horizon radiates thermally, so a black hole has a temperature, does lose mass, and the area theorem holds only classically. In 1976 he drew the conclusion that made the subject a foundational problem rather than an astrophysical one: if the radiation is genuinely thermal, information about what formed the hole is destroyed, which quantum mechanics forbids. He defended that position for decades, wagered on it publicly against John Preskill, and conceded the bet in 2004 - a concession many physicists regarded as premature, since the mechanism he offered was not generally accepted. Not a place.
A person is not a place. Drawing it on a map would assert something about the world that no stored fact supports.
Read in · 1
Timeline
No dated observations are stored for this object. Atlas shows what was observed and when — it does not infer a history.
Connections · 0
Assembled narrative · 1
Assembled from 12 blocks · 2 evidence · 7 related
- Story
- British theoretical physicist who supplied both the strongest classical result about black hole horizons and the quantum calculation that undermined it. In 1971 he proved that the total horizon area cannot decrease in classical general relativity. In 1974 he showed that once quantum fields are included the horizon radiates thermally, so a black hole has a temperature, does lose mass, and the area theorem holds only classically. In 1976 he drew the conclusion that made the subject a foundational problem rather than an astrophysical one: if the radiation is genuinely thermal, information about what formed the hole is destroyed, which quantum mechanics forbids. He defended that position for decades, wagered on it publicly against John Preskill, and conceded the bet in 2004 - a concession many physicists regarded as premature, since the mechanism he offered was not generally accepted. Not a place.
- Knowledge
- Stephen Hawking
- Connections
- Hawking radiation
- Hawking shows that black holes radiate
- Hawking argues that information is destroyed
- Hawking concedes the information bet
- Evidence
- Derives thermal emission from a black hole horizon at a temperature inversely proportional to mass. V55 VERIFICATION BASIS: not consulted in session; no research tool was available. Volume and page are from recall of a canonical citation and must be checked. The fuller treatment appeared in Communications in Mathematical Physics in 1975 and is deliberately not cited by volume here.
- Argues that black hole evaporation destroys information and therefore conflicts with the unitarity of quantum mechanics. V55 VERIFICATION BASIS: not consulted in session; no research tool was available. Volume and page are from recall and must be checked.
Observed changes · 0
No public Signals are attached to this object. Signals show what changed and when it was observed — never a direction or a rank.
Actions
/atlas?object=PERSON_STEPHEN_HAWKING&experience=PERSON_STEPHEN_HAWKING