Scalar Field
Quintessence is a scalar field whose equation of state wq, defined as the ratio of its pressure pq and its density q, is given by the potential energy and a kinetic term:
- .
Hence, Quintessence is dynamic, and generally has a density and equation of state that varies with time. By contrast, a Cosmological Constant is static, with a fixed energy density and wq = −1.
Read more about this topic: Quintessence (physics)
Famous quotes containing the word field:
“What though the field be lost?
All is not lost; the unconquerable Will,
And study of revenge, immortal hate,
And courage never to submit or yield:
And what is else not to be overcome?”
—John Milton (1608–1674)