Compare · Before the Universe

Tryon Vacuum Fluctuation vs Vilenkin's Tunneling from Nothing

Quantum Tunneling Origin· within family

	Tryon Vacuum Fluctuation Historical	Vilenkin's Tunneling from Nothing Speculative
Proposed	1973	1982
Key figures	Edward Tryon	Alexander Vilenkin
In one sentence	Tryon's 1973 Nature paper proposed the universe is a quantum fluctuation with zero net energy, the historical precursor to all "universe from nothing" proposals.	Vilenkin proposed in 1982 that the universe quantum-tunneled into existence from a state with no space, no time, no fields, literal nothing.
Predictions	Total energy of universe ~ 0 Universes can spontaneously fluctuate from vacuum	[[Inflation]] begins naturally with high probability after tunneling Universe is initially small, closed, and de Sitter-like No contracting phase before the Bang
Where it breaks	Tryon's proposal still presupposes a quantum vacuum and laws, not truly nothing Vilenkin (1982) provides the rigorous framework Tryon lacked	Krauss: still requires quantum laws, so not really nothing Hawking & Bousso (1995): catastrophic particle production Penrose: ignores Weyl curvature hypothesis
Key unresolved problem	The pre-existing vacuum problem: Tryon's proposal still starts from a quantum vacuum that already comes with physical laws and geometry, so it explains the universe but not where those prior ingredients came from.	The laws-from-nothing problem: the quantum tunneling that creates the universe still needs quantum laws and a space of possible states to work in, so the proposal has not truly started from nothing.
Reader vote	0% · 0 votes	100% · 2 votes

Tryon Vacuum Fluctuation

1973 · Historical

Vilenkin's Tunneling from Nothing

1982 · Speculative

Proposed

1973

1982

Key figures

Edward Tryon

Alexander Vilenkin

In one sentence

Tryon's 1973 Nature paper proposed the universe is a quantum fluctuation with zero net energy, the historical precursor to all "universe from nothing" proposals.

Vilenkin proposed in 1982 that the universe quantum-tunneled into existence from a state with no space, no time, no fields, literal nothing.

Predictions

Total energy of universe ~ 0
Universes can spontaneously fluctuate from vacuum

[[Inflation]] begins naturally with high probability after tunneling
Universe is initially small, closed, and de Sitter-like
No contracting phase before the Bang

Where it breaks

Tryon's proposal still presupposes a quantum vacuum and laws, not truly nothing
Vilenkin (1982) provides the rigorous framework Tryon lacked

Krauss: still requires quantum laws, so not really nothing
Hawking & Bousso (1995): catastrophic particle production
Penrose: ignores Weyl curvature hypothesis

Key unresolved problem

The pre-existing vacuum problem: Tryon's proposal still starts from a quantum vacuum that already comes with physical laws and geometry, so it explains the universe but not where those prior ingredients came from.

The laws-from-nothing problem: the quantum tunneling that creates the universe still needs quantum laws and a space of possible states to work in, so the proposal has not truly started from nothing.

Reader vote

0% · 0 votes

100% · 2 votes