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Old 10-11-2004   #3 (permalink)
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RE: Gravitons

All massless particles travel at the speed of light. and as it turns out that the graviton is massless, it travels at the speed of light.
the handwaving argument why massless particles travel with the speed of light:
- To accalarate a particle, you need some energy, proportional to it's mass.
- Special relativity says that the faster a particle moves,the higher it's 'effective' mass becomes.
- at the time you want to give the particle the speed f light: the mass becomes infinite, therefore the energy required to do this is infinite. This basicly means that it is impossible.
- so the only way to have a particle move at the speed of light, would mean to give it mass 0.

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