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, strong, cosmic, censorship and/or hypothesis:
“How weak and little is the light,
All the universe of sight,
Love and delight,
Before the might,
If you love it not, of night.”
—Edward Thomas (1878–1917)
“It is very difficult for people to believe the simple fact that every persecutor was once a victim. Yet it should be very obvious that someone who was allowed to feel free and strong from childhood does not have the need to humiliate another person.”
—Alice Miller (20th century)
“A cosmic philosophy is not constructed to fit a man; a cosmic philosophy is constructed to fit a cosmos. A man can no more possess a private religion than he can possess a private sun and moon.”
—Gilbert Keith Chesterton (1874–1936)
“... a phallocentric culture is more likely to begin its censorship purges with books on pelvic self-examination for women or books containing lyrical paeans to lesbianism than with See Him Tear and Kill Her or similar Mickey-Spillanesque titles.”
—Robin Morgan (b. 1941)
“Oversimplified, Mercier’s Hypothesis would run like this: “Wit is always absurd and true, humor absurd and untrue.””
—Vivian Mercier (b. 1919)