Weak and Strong Cosmic Censorship Hypothesis
The weak and the strong cosmic censorship hypothesis are two conjectures concerned with the global geometry of spacetimes.
- The weak cosmic censorship hypothesis asserts there can be no singularity visible from future null infinity. In other words, singularities need to be hidden from an observer at infinity by the event horizon of a black hole.
Mathematically, the conjecture states that, for generic initial data, the maximal Cauchy development possesses a complete future null infinity.
- The strong cosmic censorship hypothesis asserts that, generically, general relativity is a deterministic theory, in the same sense that classical mechanics is a deterministic theory. In other words, the classical fate of all observers should be predictable from the initial data. Mathematically, the conjecture states that the maximal Cauchy development of generic compact or asymptotically flat initial data is locally inextendible as a regular Lorentzian manifold.
The two conjectures are mathematically independent, as there exist spacetimes for which the weak cosmic censorship is valid but the strong cosmic censorship is violated and, conversely, there exist spacetimes for which the weak cosmic censorship is violated but the strong cosmic censorship is valid.
Read more about this topic: Cosmic Censorship Hypothesis
Famous quotes containing the words weak and, weak, strong, cosmic, censorship and/or hypothesis:
“For them it’s out-of-date and outmoded to perform miracles; teaching the people is too like hard work, interpreting the holy scriptures is for schoolmen and praying is a waste of time; to shed tears is weak and womanish, to be needy is degrading; to suffer defeat is a disgrace and hardly fitting for one who scarcely permits the greatest of kings to kiss the toes of his sacred feet; and finally, death is an unattractive prospect, and dying on a cross would be an ignominious end.”
—Desiderius Erasmus (c. 1466–1536)
“It is the weak and confused who worship the pseudosimplicities of brutal directness.”
—Marshall McLuhan (1911–1980)
“If I were as I once was, the strong hoofs crushing the sand and the shells,
Coming out of the sea as the dawn comes, a chaunt of love on my lips,
Not coughing, my head on my knees, and praying, and wroth with the bells,
I would leave no saint’s head on his body from Rachlin to Bera of ships.”
—William Butler Yeats (1865–1939)
“Your mind was wrought in cosmic solitude,
Through which careered an undulous pageantry
Of fiends and suns, darkness and boiling sea,
All held in ordered sway by beauty’s mood.”
—Allen Tate (1899–1979)
“The censorship method ... is that of handing the job over to some frail and erring mortal man, and making him omnipotent on the assumption that his official status will make him infallible and omniscient.”
—George Bernard Shaw (1856–1950)
“It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.”
—Ludwig Wittgenstein (1889–1951)