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# Graviton 2012

last edited by 9 years, 4 months ago

There are two parts to gravity: the force, and the proposed particle.  The force we have understood since Newton wrote his laws of gravity.  This force is apparent on earth, because it affects everything on it.  The other part of gravity, though, is not understood yet.  Since gravity is one of the four fundamental forces of the universe, we assume it has similar properties to the other three.  The other three have particles that regulate their working, for example, electromagnetism is regulated by photons, and weak nuclear force by W and Z bosons.  Although we have looked into the "particle" part of gravity, we have not yet found one.  We have given this theoretical particle an ominous name: The Graviton.

This is gravity not causing attraction, but bending space-time resulting in massive objects to exert a force on other objects: The Graviton is a theoretical massless particle that is responsible for gravity.  It must be a force carrier, and therefore a boson.  Scientists predict that it would have to have a spin of 2, which would be the highest of any of the four fundamental forces.  The Graviton is assumed as being a particle because the equations of gravity are similar to the equations of other particle-mediated forces, such as electromagnetism.  Also, the standard model works so well for the other 3 fundamental forces, and the properties of the graviton can be extrapolated.  Gravity depends on mass, so gravitons must be in a certain amount for any given atom.  Gravitons are said to bounce between two objects at the speed of light, bending space-time and creating an attraction between two objects.  Gravitons travel at the speed of light, and because they are massless, this is not a problem.  Gravity is the weakest of the four fundamental forces, so gravity was the first to break off from the main force, and therefore it is the last to rejoin with it when temperature and pressure rise enough.

Sites used: http://en.wikipedia.org/wiki/Graviton

http://curious.astro.cornell.edu/question.php?number=535