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Curvature of spacetime is just another word for gravity - in General Relativity they are regarded as the same thing.For spacetime to be curved you need mass/energy to produce gravity, but according to the Law of Conservation of Energy, mass/energy cannot be created. So the total mass/energy of the Universe is zero, and the curvature of spacetime must therefore be zero (on a large scale). The energy of the matter within the Universe is balanced by the negative energy of its gravitational field, giving a total of zero.So you do not need inflation to explain the flatness of spacetime, only the Law of Conservation of Energy.

Quote from: Pikaia on 16/11/2010 00:14:00Curvature of spacetime is just another word for gravity - in General Relativity they are regarded as the same thing.For spacetime to be curved you need mass/energy to produce gravity, but according to the Law of Conservation of Energy, mass/energy cannot be created. So the total mass/energy of the Universe is zero, and the curvature of spacetime must therefore be zero (on a large scale). The energy of the matter within the Universe is balanced by the negative energy of its gravitational field, giving a total of zero.So you do not need inflation to explain the flatness of spacetime, only the Law of Conservation of Energy.Yes inflation is required. ...sorry, you cannot view external links. To see them, please REGISTER or LOGIN

See what you said is basically the same as accepting there is very little curvature in spacetime, therefore you conclude niavely then that energy must be zero.

Quote from: QuantumClue on 16/11/2010 05:45:30See what you said is basically the same as accepting there is very little curvature in spacetime, therefore you conclude niavely then that energy must be zero. No it is the other way round. Total energy must be exactly zero because of the conservation of energy. It follows that the average curvature must be exactly zero. This is confirmed by observation, so I still do not see any need for inflation.