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- For other uses, see Gravitation (disambiguation), Gravity (disambiguation).
In physics, gravitation or gravity is the tendency of objects with mass to accelerate toward each other. Gravitation is one of the four fundamental interactions in nature, the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravitation is the weakest of these interactions, but acts over great distances and is always attractive. In classical mechanics, gravitation arises out of the force of gravity (which is often used as a synonym for gravitation). In general relativity, gravitation arises out of spacetime being curved by the presence of mass, and is not a force. In quantum gravity theories, either the graviton is the postulated carrier of the gravitational force, or time-space itself is envisioned as discrete in nature, or both.
The gravitational attraction of the Earth endows objects with weight and causes them to fall to the ground when dropped (the earth also moves toward the object, but this is so small the effects are negligible at best ). Moreover, gravitation is the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not have coalesced into these bodies and life as we know it would not exist. Gravitation is also responsible for keeping the earth and the other planets in their orbits around the sun, the moon in its orbit around the earth, for the formation of tides, and for various other natural phenomena that we observe.
More on [ Gravitation ]
Superstrings :: Quantum Field Theory
Special Relativity
Gravitation is not responsible for people falling in love.Albert Einstein
indutkribel (Indy Prawira) Thu, 24 Dec 2009 18:24:23 -0000
Gravitation is not responsible for people falling in love.Albert Einstein
gmt, minha prima linda e absoluta tá aqui, ela chegou de viajem,e amanha eu vou pra salinas\õ e a manu me emprestou os mangas do gravitation
victorkey (João Victor Almeida) Thu, 24 Dec 2009 16:05:15 -0000
gmt, minha prima linda e absoluta tá aqui, ela chegou de viajem,e amanha eu vou pra salinas\õ e a manu me emprestou os mangas do gravitation
"Gravitation is not responsible for people falling in love." #creation by Einstein
XyngularBiz (Xyngular) Thu, 24 Dec 2009 11:59:03 -0000
"Gravitation is not responsible for people falling in love." #creation by Einstein
Gravitation Complete DVDRip GerJapDub GerSub (http://cli.gs/MpLUY)
Kino_Blog (Kino Blogger) Thu, 24 Dec 2009 11:31:54 -0000
Gravitation Complete DVDRip GerJapDub GerSub (http://cli.gs/MpLUY)
RT @PutriEinsteinia: quote from albert einstein RT @axlayam: Gravitation is not responsible for people falling in love.
riskila (Okki Priskila) Thu, 24 Dec 2009 11:22:40 -0000
RT @PutriEinsteinia: quote from albert einstein RT @axlayam: Gravitation is not responsible for people falling in love.
RT @axlayam: Gravitation is not responsible for people falling in love.
riskila (Okki Priskila) Thu, 24 Dec 2009 11:21:01 -0000
RT @axlayam: Gravitation is not responsible for people falling in love.
Quantum Gravity - A site maintained by Cambridge University on advances in quantum theories of gravity.
A new road to the Quantum Gravity - This Web site explores the possibility that our universe is not an isolated system. From this hypothesis a quantum origin of the gravitation is obtained.
An Introduction to Simplicial Gravity - Contains introductory material on quantum mechanics and relativity and outlines one method of combining the two theories.
An Ode to Effective Lagrangian - A brief introduction is given to the methods of effective lagrangians. The emphasis is on a summary of the overall picture, using a simple model of quantum gravity.
Astronomy Today - Quantum Gravity - Astronomy Today - Article on Gamma Ray bursts which may reveal Quantum Gravity.
Canonical Quantum Gravity - This is a summary of a talk delivered at the workshop Quantum gravity in the Southern Cone II
Cause of gravity and an explanation of field dynamics - An intuitive contribution to the gravity debate.
Meta Description: [ The cause of gravity remains illusive despite exhaustive mental energy applied to the subject. This is an intuitive contribution to the gravity debate ]
Classical and Quantum Gravity - A journal for physicists, mathematicians and cosmologists working in the fields of gravitation and the theory of spacetime. Abstracts, full text editorials, and freely available featured articles.
Cosmological applications of loop quantum gravity - After a brief introduction to classical and quantum gravity we discuss applications of loop quantum gravity in the cosmological realm. This includes the basic formalism and recent results of loop quantum cosmology.
Discrete Approaches to Quantum Gravity - The construction of a consistent theory of quantum gravity is a problem in theoretical physics that has so far defied all attempts at resolution. Reviewed here are three major areas of research: gauge-theoretic approaches; quantum Regge calculus; and the method of dynamical triangulations.
Gravitational Theory - Views on The Directional Gravity Theory.
Gravity as an Effective Field Theory - This is a pedagogical introduction to the treatment of general relativity as a quantum effective field theory.
How far are we from the quantum theory of gravity? - An assessment is offered of the progress that the major approaches to quantum gravity have made towards the goal of constructing a complete and satisfactory theory. The emphasis is on loop quantum gravity and string theory, although other approaches are discussed.
How gravity works at microscopic scales - Discusses in simple terms the problem of constructing a quantum theory of gravity.
Meta Description: [ The Problem of Constructing Quantum Gravity ]
Knots and Quantum Gravity - The book Knots and Quantum Gravity is the proceedings of a conference held at U.C. Riverside on May 14-16th, 1993. It is now available for free in Postscript format.
Loop Quantum Gravity - A general overview of ideas, results and open problems of loop quantum gravity.
Loop quantum gravity induced modifications to particle dynamics - The construction of effective Hamiltonians arising from Loop Quantum Gravity and incorporating Planck scale corrections to the dynamics of photons and spin 1/2 particles is summarized.
Matters of Gravity - An online journal with articles on advances in the theories of gravity.
Max Planck Institute for Gravitational Physics - Institute established to pursue research in gravitational physics, especially general relativity and quantum gravity.
Meta Description: [ The Max Planck Institutes perform basic research in the natural sciences, life sciences, and social sciences in the interestof the general public. In particular, the Max Planck Society takes up new and innovative research areas. ]
Numerical Quantum Gravity - An overview of work being done in the field of quantum gravity.
Perimeter Institute for Theoretical Physics - International focal point of cutting-edge research in foundational theoretical physics.
Meta Description: [ International focal point of cutting-edge scientific research and educational outreach in foundational theoretical physics. ]
Physics News Update - Quantum Gravitational States - Quantum gravitational states have been observed for the first time. An experiment with ultracold neutrons.
PhysicsWeb - Neutrons reveal quantum effects of gravity. - PhysicsWeb, A resource for physicists, PhysicsWorld, Institute of Physics, Electronic Publishing, online products and services.
Meta Description: [ TBA ]
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QGravity.Org - An simple overview of current theories of quantum gravity.
Quantum Gravity - A brief explanation of the search for a quantum theory of gravity, including links to sites on topological field theories.
Quantum Gravity - Quantum Gravity: A road map towards the Grand Unified Theory.
Meta Description: [ Quantum mechanics is weird science,quantum gravity is both weird and mysterious. Quantum gravity has a sort of a metaphysical connotation attached to it ]
Quantum Gravity and M-Theory - A review of modern approaches to quantum gravity.
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Quantum Gravity Treatment of the Angel Density Problem - How many angels can dance on the head of a pin? A discussion on a theological question since the Middle Ages.
Quantum Relativity Theory of Everything - Preliminary look at a new approach to Relativity, Cosmology and the Quantum nature of the universe.
Meta Description: [ Unification of Relativity and Quantum Mechanics. Unified mechanism of Zero point energy, Mass, Gravity, Cosmology, Inflation, Dark energy, Cosmological constant, Speed of light, Quantum entanglement, Chaos, Lumpiness of Universe ]
Sir Isaac Newton - The Universal Law of Gravitation - Sir Isaac Newton's theroy on gravitational attraction.
Spin Foam Models - A review of the spin foam formulation of quantum gravity.
Strings, Loops and Others - This postscript file contains a review of the present theoretical attempts to understand the quantum properties of spacetime.
Summary Report of the D2 Workshop - A review of material presented at 1998 conference on quantum cosmology.
Throwing Einstein for a Loop - A scientific american article which gives a summary of loop quantum gravity.
Meta Description: [ Science and Technology at Scientific American.com: Throwing Einstein for a Loop -- Science and Technology from Scientific American: daily science news and technology news, science trivia, science experts, science newsletters, science shop, science books and more ]
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