Page states what unitarity requires of the radiation
node
Don Page pointed out that if evaporation is unitary, the entanglement entropy of the emitted radiation must rise while the hole is large, turn over at roughly the halfway point, and return to zero when the hole is gone. Hawking's calculation produces a curve that only rises. The Page curve turned a philosophical disagreement into a quantitative target: any proposed resolution has to reproduce a specific shape, and for twenty-six years none did from within gravity itself.
A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.
Read in · 1
Evidence · 1
Timeline
No dated observations are stored for this object. Atlas shows what was observed and when — it does not infer a history.
Connections · 2
- The black hole information paradoxassesses
- Black hole entropyconcerns
Assembled narrative · 1
An assembled narrative is available for this object.
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=EVT_PAGE_CURVE_1993