Wiktionary
a. (context mathematics English) Having to do with extremum. n. (context mathematics English) Any solution to a variety of equations in the calculus of variations
Usage examples of "extremal".
Surprisingly, after completing their calculation of the entropy of such a five-dimensional black hole they realized that no theoretician had as yet constructed such hypothetical extremal black holes in the setting of five-dimensional general relativity.
Not for the first time, Mannheim's thoughts turned enviously to the beautiful, high-tech liner from Novya Romanov that had pulled out six hours ago on an invisible wave of curved space-time, surfing in the grip of an extremal singularity.
The extremal singularity in her drive core let her accelerate in real space as rapidly as some warships: six light hours was a one-week cruise for her, not the painful odyssey an old hydrogen burner would have to endure.
Wednesday ignored the exhibitionist extremals: they were fundamentally boring, attention-craving types who needed to be needed and were far too demanding to make good fuck-friends.
They showed that they could build—theoretically, of course—certain extremal black holes by starting with a particular collection of BPS branes (of certain specified dimensions) and binding them together according to a precise mathematical blueprint.
At least for the class of extremal black holes, they had succeeded in using string theory to account for the microscopic constituents and the associated entropy precisely.