Science › Creation theories
False vacuum: energy trapped in empty space
1977· Idea
Well supportedStrong evidence or math, but not fully tested.
A state of a field that looks settled but is not its lowest-energy state, so calm, empty space there still holds trapped energy.
See it on the Science map →How it works
Every field has an energy landscape of hills and valleys, and settles into a valley. If it rests in a high valley instead of the lowest one, that is a false vacuum: space that is empty and calm, yet carries a fixed amount of energy in every cubic meter. As the young universe cooled, fields had to pick valleys, and one could get stuck in a high one. Sidney Coleman's 1977 analysis made the idea precise.
Why it matters
It gave inflation its engine, and it raises the unsettling possibility that our own empty space is not the final, lowest state.
Think of it like
Like a lake in a high mountain basin: perfectly still, yet holding energy that would rush downhill if the rim ever gave way.
How we know
The concept is standard quantum field theory. Metastable states are common in nature: diamond is a higher-energy form of carbon than graphite, yet lasts essentially forever. Whether the early universe sat in a false vacuum is unproven.
Still a mystery
Whether the early universe was ever truly stuck in one, and whether today's vacuum, with its small dark energy, is itself a false vacuum waiting to decay.
Connections (3)
▸False vacuum: energy trapped in empty space powers Cosmic inflationWell supported
The relationship
False-vacuum energy stays the same in every cubic meter as space grows, so it never dilutes. General relativity says such energy has negative pressure, which makes gravity repel. The result is a steady expansion rate: space doubles, then doubles again, in equal tiny intervals. As long as the false vacuum lasts, the growth continues exponentially.
How the link was found
Alan Guth, 1979–80. Erast Gliner had suggested in 1965 that vacuum-like matter repels; Katsuhiko Sato in Japan and Demosthenes Kazanas proposed exponential growth from vacuum energy in 1980–81.
Is it proven?
Vacuum energy's push is observed today: dark energy, found in 1998, accelerates expansion the same way, though, in typical models, over 10¹⁰⁰ times more weakly. That inflation itself ran on this is inferred, not observed.
Open questions and mysteries
Modern models mimic a false vacuum with a slowly rolling field rather than a truly stuck one. Which, if either, powered our universe's inflation is unknown.
▸False vacuum: energy trapped in empty space can end in Vacuum decay and bubbles of new spaceWell supported
The relationship
A false vacuum is protected by an energy barrier, but not perfectly. Quantum tunneling lets a tiny region slip through to the lower state. Small bubbles collapse back, because their wall costs energy; a bubble above a critical size gains more from its interior than its wall costs, and grows without limit. The decay rate depends exponentially on the barrier's height and width.
How the link was found
Igor Kobzarev, Lev Okun and Mikhail Voloshin in Moscow studied such bubbles in 1974. Sidney Coleman at Harvard gave the standard rate calculation in 1977, with Curtis Callan; Coleman and Frank De Luccia added gravity in 1980.
Is it proven?
The method uses the same tunneling physics that explains radioactive decay, and lab analogs show the predicted bubbles. No decay of a cosmic false vacuum has been observed.
Open questions and mysteries
Because the rate is exponentially sensitive, small uncertainties in inputs change predicted lifetimes by enormous factors. How gravity and expansion alter tunneling is still debated.
▸Alan Guth built "old inflation" on False vacuum: energy trapped in empty spaceWell supported
The relationship
In Guth's model, a grand unified field cooled but stayed stuck in its false vacuum, supercooling like water below freezing. That trapped energy drove inflation. It was meant to end when bubbles of true vacuum formed and merged, releasing heat. But bubbles formed randomly and the space between kept inflating, so they never joined, leaving a hopelessly lumpy universe.
How the link was found
Guth described the plan, and its flaw, in his 1981 paper. Guth and Erick Weinberg, and separately Hawking, Ian Moss and John Stewart, confirmed in 1982–83 that the bubbles never merge. It became known as 'old inflation'.
Is it proven?
The bubble calculations are standard. The microwave background is smooth to 1 part in 100,000, which a universe of colliding bubbles could not produce, so old inflation is ruled out.
Open questions and mysteries
The stuck false vacuum survives in eternal-inflation and string-landscape pictures, where one bubble becomes a whole universe. Whether our universe began that way is open.