Quintessence is a dynamic, time-evolving, and spatially dependent form of energy with negative pressure sufficient to drive the accelerating expansion, ... Whereas the cosmological constant is a very specific form of energy vacuum energy quintessence en
Quotes about cosmological (5 Quotes)
Never before had China seen a religion so rich in imagery, so beautiful and captivating in ritualism and so bold in cosmological and metaphysical speculations. Like a poor beggar suddenly halting before a magnificent storehouse of precious stones of dazzling brilliancy and splendor, China was overwhelmed, baffled and overjoyed. She begged and borrowed freely from this munificent giver. The first borrowings were chiefly from the religious life of India, in which China's indebtedness to India can never be fully told.
If these earliest stars were very massive and formed in the standard cosmological mode, they should have left a signature in the fluctuations of the CIB. That's the signal we sought to measure with these observations.
The cosmological constant was a vacuum energy (the energy of empty space) that kept gravity from pulling the universe in on itself, ... A problem with the cosmological constant is that it is constant, with the same energy density, pressure, and equation of state over time. Dark energy, however, had to be negligible in the universe's earliest stages otherwise the galaxies and all their stars would never have formed.
There were hints, in those days, that the neutrino might have a rest mass as large as ten eV, a value of cosmological significance.