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Topic: De Sitter space

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	Juegos de - Bienvenido a Juegos de
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		Con un poco de practica conseguiras saber jugar, se traya de junt...
		Juego de Pepsi, unos luchadores de sumo se encuentran en un campo...
	www.juegosde.info (805 words)

	Home Sitters
		Trip sitter is a term used by recreational drug users to describe a person who remains sober to ensure the safety of the drug user while he or she is under the influence of a drug.
		De Sitter is a lunar crater that is located near the northern limb of the Moon, to the north of the Baillaud-Euctemon crater pair.
		The interior floor of De Sitter is somewhat irregular and hummocky, with a slender central ridge near the mid-point.
	www.artistbooking.com /trips/83/home-sitters.html (1079 words)

	Sitter biography
		De Sitter corresponded with Ehrenfest in 1916, and he proposed that a four- dimensional space- time would fit in with cosmological models based on general relativity.
		De Sitter's work led directly to Eddington's 1919 expedition to measure the gravitational deflection of light rays passing near the Sun, results which, at that time, could only be obtained during an eclipse.
		De Sitter, unlike Einstein, maintained that relativity actually implied that the universe was expanding, theoretical results which were later verified observationally and accepted by Einstein.
	www-groups.dcs.st-and.ac.uk /~history/Biographies/Sitter.html (497 words)

	De Sitter space - Wikipedia, the free encyclopedia
		De Sitter space is most easily defined as a submanifold of Minkowski space in one higher dimension.
		De sitter space is the submanifold described by the hyperboloid
		The metric on de Sitter space is the metric induced from the ambient Minkowski metric.
	en.wikipedia.org /wiki/De_Sitter_space (512 words)

	Willem de Sitter Bibliography
		de Sitter, Willem, “A. Einstein’s Theory of Gravitation and its Astronomical Consequences,” MNRAS 76, 699-728 (1916); 77, 155-83 (1916); 78, 3-28 (1917).
		de Sitter, W., “On the Distances and Radial Velocities of Extra-Galactic Nebulae, and the Explanation of the Latter by the Relativity Theory of Inertia,” Proceedings of the National Academy of Sciences 16, 474-88 (1930).
		Einstein, A. and W. de Sitter, “On the Relation between the Expansion and the Mean Density of the Universe,” Proceedings of the National Academy of Sciences 18, 213 (1932).
	www.phys-astro.sonoma.edu /BruceMedalists/deSitter/deSitterRefs.html (1515 words)

	Willem de Sitter Summary
		The calculations are complex, but De Sitter's expertise in celestial mechanics and his mathematical precision enabled him to contribute new data on the moons, which he studied for many years.
		In 1905 De Sitter took note of Albert Einstein's special theory of relativity, and brought it to the attention of English-speaking scientists, using it to account for small deviations in the motions of the moon and planets.
		De Sitter died at Leiden, Netherlands, at the age of 62 on November 20, 1934.
	www.bookrags.com /Willem_de_Sitter (517 words)

	Ah, the Binomial Coefficient! \| UberKuh (Site not responding. Last check: 2007-10-28)
		Einstein immediately rejected the de Sitter solution because it went against his intuition - it implied that space-time can be curved in the absence of matter - although he ended up accepting the idea after some debate.
		In de Sitter space the universe expands exponentially, which is the basis of the inflationary model of the universe.
		Obtaining a de Sitter solution is therefore a major challenge for string theory, which has been the main candidate for a fundamental theory of the universe for almost 20 years.
	uberkuh.com /node/419 (834 words)

	research interests (Site not responding. Last check: 2007-10-28)
		de Sitter space, the space-time associated with a positive cosmological constant, often serves as an idealization for the slowly rolling phase of inflation.
		One striking difference from Minkowski space is the existence of a one-parameter family of invariant vacuum states, typically distinguished by a complex number α.
		I have also extended this work to include fermionic theories, which in de Sitter space have their own α states, and constructed a framework in which interacting theories of fermions could also be renormalized.
	people.umass.edu /hael/research.html (1819 words)

	[No title]
		An important question in high energy physics experimentation, is to establish the likelihood of inititating a transition towards de Sitter space thus releasing the force of supernova upon our earth, the solar system, and a host of nearby stars to the distance of some fifty lightyears.
		It may be postulated, however, that the intrusional event from de Sitter space may impinge upon the continuum from any point on the surface of the unit sphere.
		This work therefore is concerned with the novel hypothesis of an intrusional event from de Sitter space as an alternative hypothesis to the "central machine" accretion disk orbiting a supermassive (10 to the 8th - 10 to the 9th solar masses) fl hole model of Martin Rees.
	www2.hawaii.edu /~dixon/nova.txt (4762 words)

	The string-theory landscape (November 2003) - Physics World - PhysicsWeb
		De Sitter space is only a local minimum of the energy, whereas the global minimum corresponds to a flat 10D space-time.
		We therefore know that the de Sitter minimum has to be unstable, and that it will ultimately decay to the stable flat 10D minimum via quantum tunnelling (see figure).
		Once we know that there is one de Sitter solution, it is easy to find many more of them by just changing the values of the fluxes.
	physicsweb.org /articles/world/16/11/3 (1204 words)

	Professor Stephen Hawking
		Anti de Sitter fl holes may not seem of much interest, because we can be fairly sure, that the universe is not asymptotically anti de Sitter.
		The boundary of rotating anti de Sitter, is a rotating Einstein universe, of one dimension lower.
		This behavior is similar to that for Schwarzschild anti de Sitter space, and might indicate a phase transition in the corresponding conformal field theory.
	www.hawking.org.uk /lectures/nut.html (4915 words)

	4.1 Stability of de Sitter space (Site not responding. Last check: 2007-10-28)
		In [40] Friedrich proved a result on the stability of de Sitter space.
		In fact the result gives much more detail on the asymptotic behaviour than just this and may be thought of as proving a form of the cosmic no hair conjecture in the vacuum case.
		(This conjecture says roughly that the de Sitter solution is an attractor for expanding cosmological models with positive cosmological constant.) This result is proved using conformal techniques and, in particular, the regular conformal field equations developed by Friedrich.
	relativity.livingreviews.org /Articles/lrr-1998-4/node12.html (176 words)

	String Theory Sews Up Accelerating Space
		Willem de Sitter (1872—1934) was a mathematical astronomer who became a pioneer in exploring the astronomical implications of general relativity.
		A further motivation for working in de Sitter space is that it offers a means of quantizing general relativity.
		The model invites the exploration of spaces with fewer of the 11 dimensions of M theory being compact.
	www.sciencewatch.com /july-aug2005/sw_july-aug2005_page6.htm (983 words)

	www.myspace.com/sitter
		What makes SITTER shine is their ability to appeal to all age groups, from ballads to pop-rock to all-out rock ‘n roll.
		SITTER ensures that their audience is always treated to an energetic and explosive live performance.
		SITTER are currently in studio recording their follow-up to their debut album and with it are set to conquer both the South African music scene and the international music scene.
	www.myspace.com /sitter (721 words)

	Review of Top Cited HEP Articles of 2000
		A d-dimensional surface or `brane' that restricts the volume of anti-de Sitter space then corresponds to a momentum cutoff on the corresponding d-dimensional field theory, a brane at large radius corresponding to an ultraviolet cutoff, and a brane in the interior corresponding to an infrared cutoff.
		This is the `noncommutative Yang-Mills theory', invented by Connes in 1980, a theory of vector bosons on a rigid space-time in which the space derivatives have a nonzero commutator characterized by a fixed antisymmetric matrix.
		Randall and Sundrum [4] and Gogberashvili (hep-ph/9812296) observed that, in this scenario, the stretching due to the curvature of the anti-de Sitter space moves quantum fluctuations on the second brane to much lower energy, in fact, to arbitrarily low energy as the separation of the branes is increased.
	www.slac.stanford.edu /library/topcites/topcites.review.2000.html (4077 words)

	The Bruce Medalists: Willem de Sitter
		Willem de Sitter studied mathematics at the University of Groningen, where a chance meeting with David Gill led to an invitation to work at Her Majesty’s Observatory at the Cape of Good Hope.
		Since Holland remained neutral in World War I, de Sitter was able to be the liaison between scientists in warring countries, notably A.S Eddington in Britain and Albert Einstein in Germany.
		De Sitter-Suermondt, Eleonora [wife], Willem de Sitter, een Mensenleven (Tjeenk Willink and Zoon, Haarlem, 1948) [in Dutch].
	www.phys-astro.sonoma.edu /BruceMedalists/deSitter/index.html (371 words)

	Anti de Sitter space - Wikipedia, the free encyclopedia
		It may be regarded as the Lorentzian analog of n-dimensional hyperbolic space.
		In the language of general relativity, anti de Sitter space is the maximally symmetric, vacuum solution of Einstein's field equation with a negative cosmological constant Λ.
		The constant time slices of this coordinate patch are hyperbolic spaces in the Poincaré half-plane metric.
	en.wikipedia.org /wiki/Anti_de_Sitter_space (507 words)

	[No title] (Site not responding. Last check: 2007-10-28)
		ADS, CFT, is a conjectured duality between supergravity in anti de Sitter space, and a conformal field theory on the boundary of anti de Sitter space, at infinity.
		The trivial topology, periodically identified anti de Sitter space, fills in the torus, but so also do non-trivial topologies, the best known of which is Schwarzschild anti de Sitter.
		The action of an anti de Sitter like space, with a boundary at infinity, would be infinite, so one has to regularize.
	pancake.uchicago.edu /~carroll/hawkingdublin.txt (2582 words)

	[No title]
		As it turns out, everyone's right, according to his or her own definition of "de Sitter space" and "spatially finite." When cosmologists talk about de Sitter space, we slice it up into constant-time hypersurfaces that are spatially flat and infinite.
		The de Sitter universe > > > can be described as a hyperboloid in 5-dimensional space, therefore, > > > its slices are 3-spheres which are definitely spatially finite.
		When de Sitter first wrote the metric for this space, little was understood about what cosmological metrics should look like.
	www.math.niu.edu /~rusin/known-math/00_incoming/universe (1835 words)

	IngentaConnect On the solution of the Dirac equation in de Sitter space (Site not responding. Last check: 2007-10-28)
		It is shown that the maximal number of first-order symmetry operators for the Dirac equation (including spin symmetries), both in arbitrary signature flat space and in de Sitter space, is equal.
		The isomorphic representation of 11-dimensional nonlinear symmetry algebra (W-algebra) of first-order operators for the Dirac operator in flat space and de Sitter space is considered.
		As an example, we consider a model of asymptotically flat space that is glued from the de Sitter space and flat space.
	www.ingentaconnect.com /content/iop/cqg/2005/00000022/00000020/art00008 (311 words)

	The Hamiltonian mass of asymptotically anti-de Sitter space-times
		is again anti-de Sitter metric in a different coordinate system, which does not differ too much from the original one; in particular the metric approaches asymptotically the standard version of the anti-de Sitter metric in the unhatted coordinates.
		of the Kottler (``Schwarzschild - anti-de Sitter'') metrics in dimension
		It should be stressed that this problem mixes two different issues, one being the potential background dependence of (6), another one being the possibility of energy flowing in or out through the timelike conformal boundary of space-time.
	www.phys.univ-tours.fr /~piotr/papers/mass/letter/index.html (2196 words)

	De Sitter on My Mind \| Musings
		Recall that we are in asymptotically de Sitter space, that is, we consider only metrics which approach the de Sitter metric at timelike-infinity.
		In de Sitter space, local observers fall out of causal contact if you wait long enough, so the formulation of the quantum theory ought to involve a choice of a particular local observer.
		In this conjectured way of formulating quantum gravity in asymptotically de Sitter space, they simply don’t act as operators on the Hilbert space, as the Hilbert space is somehow based on the physics as seen by a local observer following the worldline γ.
	golem.ph.utexas.edu /~distler/blog/archives/000051.html (979 words)

	Springer Online Reference Works
		Ishihara proved that a complete maximal space-like submanifold in a de Sitter space
		Akutagawa [a1], Q.M. Cheng [a2] and K.G. Ramanathan that complete space-like submanifolds with parallel mean curvature vector in a de Sitter space
		S. Montiel, "An integral inequality for compact space-like hypersurfaces in a de Sitter space and application to the case of constant mean curvature" Indiana Univ. Math.
	eom.springer.de /d/d110040.htm (278 words)

	Brane - Interview with Dr. Igor Klebanov
		Anti-de Sitter space, or AdS space, is a negatively curved space, where again the curvature is the same everywhere.
		It is one of these classic spaces that people have been studying for many, many years, one of the simplest curved spaces in the books.
		So basically the formulation of this anti-de Sitter space/conformal field theory correspondence in its most crystallized form is attributed to three papers: the one by Maldacena, the one by us, and another one by Witten.
	www.esi-topics.com /brane/interviews/DrIgorKlebanov.html (1928 words)

	Quantum Gravity In De Sitter Space
		It has been argued that the Hilbert space is of finite dimension.
		We give a definition of the quantum Hilbert space using the asymptotic behavior in the past and future, without requiring detailed microscopic knowledge.
		We discuss the difficulties in defining any precisely calculable or measurable observables in an asymptotically de Sitter spacetime, and explore some meta-observables that appear to make mathematical sense but cannot be measured by an observer who lives in the spacetime.
	www.physicsforums.com /showthread.php?p=426203 (340 words)

	The Super Sitter - Part 1
		There are certain things that will be expected of you as a sitter and things that you should expect of the parents.
		In addition to "sitting" with the children, these are a few of the things you should know and remember as a Safe Sitter.
		If there is too much room (more than two fingers width) between the mattress and the side of the crib, an infant's head could get caught in between and the infant could suffocate.
	www.kidsource.com /kidsource/content2/supper_sitter.html (1604 words)

	de Sitter model concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-28)
		has definition A particular solution to Einstein's cosmological equations, found by Wilhelm de Sitter in 1917, in which space expands at a rapid, exponential rate.
		This solution was very different from the solutions of Friedmann and of Lemaitre, in which the universe expands at a much slower rate (a rate with the distance between any two points increasing as something between the square root of time and linearly with time).
		Recent modifications of the big bang model, such as the inflationary universe model, propose that the universe went through a period of exponential growth, or a de Sitter phase, early in its evolution.
	www.site.uottawa.ca:4321 /astronomy/deSittermodel.html (199 words)

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