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Topic: Cosmic censorship principle

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Gravitational singularity

Naked singularity

Quantum gravity

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	Gravitational singularity - Wikipedia, the free encyclopedia
		Until the early 1990s, it was widely believed that general relativity hides every singularity behind an event horizon, making naked singularities impossible.
		This is referred to as the cosmic censorship principle.
		Shapiro, S. L., and Teukolsky, S. Formation of Naked Singularities: The Violation of Cosmic Censorship, Phys.
	en.wikipedia.org /wiki/Gravitational_singularity (756 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Transforming Penrose's intuitive picture of a strong cosmic censorship principle - that generically forbids the appearance of locally naked space-time singularities - into a formal mathematical proof, remains at present, one of the most outstanding unsolved mathematical problems from the theory of gravitational collapse.
		Part of the difficulty lies in the fact that we do not possess yet a clear-cut understanding of the hypothesis needed for the establishment of some sort of strong cosmic censorship theorem.
		What we have is a selected list of solutions, which at first sight seem to go against cosmic censorship, but at the end they fail in some way.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20512992 (296 words)

	wormhole (Site not responding. Last check: 2007-10-29)
		Many physicists, including Stephen Hawking (see Hawking's Chronology Protection Conjecture), believe that due to the problems a wormhole would theoretically create, including allowing time travel, that something fundamental in the laws of physics would prohibit them.
		However, this remains speculation, and the notion that nature would censor inconvenient objects has already failed in the case of the cosmic censorship principle.
		This has been called into question by the suggestion that radiation would disperse after traveling through the wormhole, therefore preventing infinite accumulation.
	www.yourencyclopedia.net /Wormhole (689 words)

	Avoid Infinity! (Site not responding. Last check: 2007-10-29)
		There is a conjecture, called cosmic censorship, that proposes that all singularities that might develop in the real universe are hidden away inside event horizons.
		Therefore cosmic censorship implies that all singularities are hidden inside fl holes.
		These slices do not have any "bending pathology," but their length varies, and data on the left edge of the slice must be specified in some way.
	archive.ncsa.uiuc.edu /Cyberia/NumRel/AvoidInfinity.html (475 words)

	unification, spacetime foam, quantum vacuum, quantum fluctuations
		The cosmic singularity, that was the Universe at the beginning of time, is shielded by the lack of any physical observers.
		The same principles were probably in effect at the time of the Big Bang (although we can not test this hypothesis within our current framework of physics).
		There is the expectation that all the nuclear forces of matter (strong, weak and electromagnetic) unify at extremely high temperatures under a principle known as Grand Unified Theory, an extension of quantum physics using as yet undiscovered relationships between the strong and electroweak forces.
	zebu.uoregon.edu /~js/ast123/lectures/lec17.html (2014 words)

	Abstract (Site not responding. Last check: 2007-10-29)
		These phenomena raise fundamental questions, such as the validity of the principle of determinism in the context of classical physics.
		In particular, under a definite formulation, strong cosmic censorship is found to be false, and Cauchy horizons are shown to be stable, albeit in a weak sense.
		Besides relating to strong cosmic censorship and the fate of observers who dare cross the event horizon, this law has independent interest, as it can be interpreted in terms of observations in the astrophysical regime.
	www.math.psu.edu /ccma/seminar/abstracts/mdafermos04.html (368 words)

	CLASSICAL AND QUANTUM ASPECTS OF BLACK HOLES
		The second main subject deals with the charged rotating fl hole in three spacetime dimensions and the cosmic censorship principle.
		Here we want to obtain a deeper understanding of the electrically charged rotating fl hole and to explore the mechanism that underlies the cosmic censorship principle.
		Solving this problem will bring strong insights on the underlying mechanism of the cosmic censorship principle.
	www.conicyt.cl /cgi-bin/proyecto_fondecyt.cgi?0120011010446 (387 words)

	Did the Big Bang Have A Cause
		In this sense, it may be argued that classical big bang cosmology is not committed to the thesis that the universe has a beginning and that this beginning is uncaused.
		This will violate cosmic completeness (the principle that a universe has an inextendible spacetime) but this violation will occur only with the horizon of the Kerr fl hole (by the cosmic censorship principle).
		Kant’s argument that his causal principle is transcendental is that it is required to distinguish the subjective succession of representations from the objective succession of events in the world.
	www.qsmithwmu.com /did_the_big_bang_have_a_cause.htm (7869 words)

	The Disintegration of Possiblity
		The point, then, is that it is arbitrary to inventory the assaults modern physics had made by 1930 on the intuitive arena for the physical project.
		This arrow can be shown to be a consequence of the principle that entropy is increasing in one direction of time.
		As one of Hawking's quotes illustrates, physicists imagine that the principles of cosmic housekeeping which they have announced in the last twenty-five years are roles for God.
	www.henryflynt.org /studies_sci/disposs.html (9357 words)

	The ‘Holy’ Family (Site not responding. Last check: 2007-10-29)
		The epithet of the street may have a cosmic precedence.
		These considerations bring the cosmos back into a human perspective, and help to explain the connection between the cosmos and microcosm.
		It is probable that sexual taboo may play a significant role in cosmic censorship.
	mywebpages.comcast.net /dantsmith/aAquarium/HolyFamily.html (338 words)

	Time Travel Portal :: View topic - Black Holes, Singularities & Wormholes
		Moving closer into the cosmic phenomena, we eventually reach the mathematical construct: an event horizon.
		In principle you can arrange a bridge game, with all four players being you yourself, at different ages.
		In a recent paper on wormholes (gr-qc/0503097), the author of that paper demonstrated that he didn't know what he was talking about.
	timetravelportal.com /viewtopic.php?t=554 (7423 words)

	Re: expansion and the de Sitter horizon
		Covariance demands that this set of points be equidistant from any given observer, 6.
		there is no generally accepted principle (including Penrose's Cosmic Censorship conjecture) whereby we would be prevented from seeing the Big Bang itself.
		(v) Does Hawking's 'no boundary conditions' proposal operate like a Cosmic Censorship principle in that it would mean that we are effectively shielded from the initial singularity?
	www.lns.cornell.edu /spr/2003-01/msg0047729.html (493 words)

	sci.physics Frequently Asked Questions (Part 3 of 4)
		These processes occur as a result of penetration of the "Coulomb barrier" that inhibits emission of charged particles from the nucleus, and their rate is very sensitive to the height of the barrier.
		Changes in the electron density could, in principle, affect the barrier by some tiny amount.
		All told, the existence of changes in radioactive decay rates due to the environment of the decaying nuclei is on solid grounds both experimentally and theoretically.
	www.faqs.org /faqs/physics-faq/part3 (7828 words)

	Citebase - Liouville Models of Black Hole Evaporation
		Comment: 27 pages, revised ("Note Added" is expanded to show how careful treatment of quantum effects makes the Hawking radiation rate proportional to N/12 rather than (N-24)/12 and also to show that the cosmic censorship mechanism proposed by Russo et.al.
		A weak version of the cosmic censorship hypothesis is implemented as a set of boundary conditions on exact semi-classical solutions of two-dimensional dilaton gravity.
		We argue that this scenario could in principle...
	www.citebase.org /cgi-bin/citations?id=oai:arXiv.org:hep-th/9205089 (1209 words)

	[No title]
		Heisenberg's uncertainty principle, which requires that their energy density fluctuates randomly.
		This general principle states that the degree of disorder of a system—its entropy—cannot
		There are restrictions similar to the Quantum Inequalities on possible violations of cosmic censorship.
	www.geocities.com /brightestnewstar/RealWarpDrive.htm (6374 words)

	Duke Nuclear/Particle Theory Seminar - aka DNPT Seminar (Site not responding. Last check: 2007-10-29)
		In this talk I want to introduce the appropriate extension of the pQCD formalism: in principle one can take into account multiple scattering by the inclusion of higher twist corrections.
		This leads to new non-perturbative matrix elements beyond the level of parton distributions which now encode the medium effects.
		Brief explanations of spacetime singularities and cosmic censorship will be given.
	www.phy.duke.edu /research/NPTheory/QCD/spring02.html (1618 words)

	week31
		Louis Crane has been doing a lot of excellent work on topological quantum field theory for the last few years, strongly advocating the use of category theory as a unifying principle in physics (essentially as an extension of the concept of symmetry embodied in group theory), but this is quite different in flavor.
		Hawking's original solution to this problem was to bite the bullet and accept the nonunitarity, even though it goes against the basic principles of quantum theory.
		So again, while the idea must seem wild to anyone who has not encountered it before, physicists these days are fairly comfortable with the idea that certain "fundamental constants" could have been other than they were.
	math.ucr.edu /home/baez/week31.html (1543 words)

	This Is Nit Picking Isn't It? - Page 4 - Bad Astronomy and Universe Today Forum
		To prevent simple random acts of surrealism we must imagine some kind of cosmic censorship principle with respect to time travel, one which allows acts of no consequence but which prevents sofas.
		I didn't say it could not be true, I said it did not count as travel.
		I can easily see such a mechanism as being a basic part of whatever principles govern travelling in time.
	www.bautforum.com /showthread.php?p=344904#post344904 (3795 words)

	week204
		Well, for the Sun, as its hydrogen gradually runs out it'll become a "red giant", expanding to engulf the Earth...
		As the core shrinks it'll heat up, and when it reaches a temperature of 100 million kelvin the helium will catch fire and start fusing - mainly into carbon.
		Or is this principle unnecessary, or perhaps inherently unscientific?
	math.ucr.edu /home/baez/week204.html (3136 words)

	UCSB Physics: General Relativity and Quantum Gravity
		This includes trying to prove (or find a counterexample to) the cosmic censorship conjecture in general relativity, and studying semi-classical processes such as the pair creation of fl holes.
		String theory is a promising candidate for a complete quantum theory of gravity.
		Correspondence Principle for Black Holes and Strings (with J. Polchinski) Phys.
	www.physics.ucsb.edu /Research/activities/grqg.php3 (167 words)

	Naked singularity (Site not responding. Last check: 2007-10-29)
		The theoretical existence of naked singularities is important because their existence would mean that it would be possible to observe the collapse of an object to infinite density.
		Computer simulations of the collapse of a disk of dust have indicated that these objects can exist and thus the Cosmic censorship principle (stating that singularities are always hidden) does not hold.
		Stephen Hawking lost a bet about this question.\n
	www.informationdepot.us /n/na/naked_singularity.html (142 words)

	Philosophy Forum -> Origins of the Universe (Site not responding. Last check: 2007-10-29)
		However, I don't see how a singularity could observe itself.
		Someone free falling into a singularity will not encounter the singularity at all only the one who is a distant observer will "observe" (taking the cosmic censorship principle aside for a moment) the singularity.
		The free falling of the observer will increasingly correspond with the properties of the singularity, untill they merge.
	forum.darwinawards.com /index.php?showtopic=4689 (6037 words)

	SBF Glossary: R
		(Actually, the available bandwidth is greater in principle and narrower by law: two radio stations in close geographic proximity are not allocated adjacent frequencies, but in any case the
		The point, though, is that the ess following recht may be an inflection or may be the first letter of the next word in the compound.
		In principle, there might be a pair of distinct words like rechtsoof and rechtsoof, constructed with soof and oof respectively, but I can't come up with an example.
	www.plexoft.com /cgi-bin/R.cgi (13824 words)

	Alumni News April 2004
		What are the physical consequences to our freedom to move forward and backward in space, but only forward in time?
		Is there a cosmic censorship principle that prevents messing with time travel so you can not kill your mother before you are born?
		Does it even make sense to talk about time travel?
	www.mc.cc.md.us /alumni/newsletter/newsletter404.html (1880 words)

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