**Physical Description**

An instanton is a classical solution to equations of motion with a finite, non-zero action, either in quantum mechanics or in quantum field theory. More precisely, it is a solution to the equations of motion of the classical field theory on a Euclidean spacetime. In such a theory, solutions to the equations of motion may be thought of as critical points of the action. The critical points of the action may be local maxima of the action, local minima, or saddle points. Instantons are important in quantum field theory because (a) they appear in the path integral as the leading quantum corrections to the classical behavior of a system, and (b) they can be used to study the tunneling behavior in various systems such as a Yang–Mills theory.

Read more about this topic: Instanton

### Other articles related to "description, physical, physical description":

... to 0x01B are used since DOS 3.0) Sector Offset BPB Offset Length (bytes)

**Description**0x00B 0x00 2 Bytes per logical sector in powers of two the most common value is 512 ... the logical sector size is often identical to a disk's

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**physical**sectors up to 1024 bytes/sector ...

**Physical Description**

... The main

**physical description**of The Hidden is from Martín Viciana, a biographer admittedly unfavorable to The Hidden ... mention the story that The Hidden was as a secret Jew in his account, as his

**description**contrasts with the normal stereotype of a Sephardic Jew ... Nalle believes that this

**description**was an intentionally unflattering one, in contrast with a prophesied savior that The Hidden had successfully presented himself as ...

### Famous quotes containing the words description and/or physical:

“As they are not seen on their way down the streams, it is thought by fishermen that they never return, but waste away and die, clinging to rocks and stumps of trees for an indefinite period; a tragic feature in the scenery of the river bottoms worthy to be remembered with Shakespeare’s *description* of the sea-floor.”

—Henry David Thoreau (1817–1862)

“I hope I may claim in the present work to have made it probable that the laws of arithmetic are analytic judgments and consequently a priori. Arithmetic thus becomes simply a development of logic, and every proposition of arithmetic a law of logic, albeit a derivative one. To apply arithmetic in the *physical* sciences is to bring logic to bear on observed facts; calculation becomes deduction.”

—Gottlob Frege (1848–1925)