The phrase "a closed universe" is correct and usable in written English.
It can be used in contexts discussing cosmology, philosophy, or theoretical frameworks where the universe is considered to have a finite boundary or is self-contained.
Example: "In a closed universe, the total energy remains constant, and the fate of the cosmos is often debated among scientists."
Alternatives: "a finite universe" or "a self-contained universe".
This is because most cosmologists reckon that the Big Bang could not have generated nearly enough ordinary matter--dark or light--to create a closed universe.
That has troubled some Brucknerian commentators, who want to imagine that every Bruckner symphony ought to be a closed universe of musical and expressive experience.
Second, and more importantly, it may illuminate the nature of the universe.The standard model of a closed universe suggests that the distribution of dark matter among the galaxies in CL0024+1654 is too smooth.
In a "closed" universe, the beams eventually cross; in an "open" universe, they spread apart.The difficulty with testing this by experiment is that the light beams must traverse an appreciable fraction of the universe before the deviations become significant.
When you watch them laugh or interact or finish one another's sentences, they seem to inhabit a closed universe, a world of secret delights that strangers can enter only by special invitation.
More tablet candidates will emerge this fall, but Apple has huge headstarts in hardware and customer base and relationships with developers large and small, and its iCloud initiative suggests a further retreat from the open Web into a closed universe of apps.
With a sufficiently high density the "closed" universe has enough gravitational pull to overcome the expansion.
Even after astronomers abandoned the notion of a closed Ptolemaic universe, hierarchical thinking was not abandoned.
With nary a snack nor workout left to chance, Dr. Levine was able to plumb the mysteries of a closed metabolic universe in which every calorie, consumed as food or expended for energy, could be accounted for.
Until this month, customers had to pay $16 a flight to log into Verizon's JetConnect system, a closed Internet universe of sorts that lets customers click through about 800 pages of news, sports, stock quotes and games, among other things, while also sending and receiving text messages, instant messages and e-mail.
