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Hartle-Hawking initial state

استات ِ آغازین ِ هارتل-هاؤکینگ

estât-e âqâzin-e Hartle-Hawking

Fr.: état initial de Hartle-Hawking

A proposal regarding the initial state of the → Universe
prior to the → Planck era. This
→ no boundary hypothesis assumes an imaginary time in that epoch.
In other words, there was no real time before the → Big Bang,
and the Universe did not have a beginning. Moreover, this model treats the Universe like
a quantum particle, in an attempt to encompass → quantum mechanics
and → general relativity;
and attributes a → wave function to the Universe.
The wave function has a large value for our own Universe, but small, non-zero values
for an infinite number of other possible, parallel Universes.

Hartle, J., Hawking, S., 1983, "Wave function of the Universe," Physical Review D 28;
→ initial; → state.