Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A solution to the imaginary time nonlinear field equation of YangMills field theory; carries information about quantum tunnelling.
Etymologies
Examples

A quantum fluctuation in the metric can pinch off a portion of vacuum energy which then quantum tunnels as an instanton through a potential field in superspace and into a nascent cosmology.

In particular how does one get a matching conditions on the moduli space for the instanton state “pretunneling state” and the tunneling state.

To the extent we can talk about a “nothingness” it appears to be some sort of instanton (tunnelling state) for the universe which exists on a false vacuum.

One idea of the creation of the universe suggests that before the universe a false vacuum existed (possibly, but not necessarily infinite in size) which our universe essentially ‘tunneled’ into as an instanton effect.

The real part is the instanton component that is a nabla S nabla I, reflecting the small quantum aspect of the spacetime — eg a WKB type of approximation.

Without this, has the idea of the ColemanDe Luccia instanton been refuted?

His moduli space mimics the hypermultiplet but at finite radius, it receives some instanton corrections.

These instanton effects become domain wall in the full physical string.

Two examples: 1) mirror symmetry gives a spectacular check of the string instanton series.
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