What General Relativity actually says is that the presence of a gravitational field can be produced by a change of coordinates, even in flat spacetime. This is so in a uniform g-field for example.heliocentricprose said:General relativity says that the gravitational "field" is just the warping of space by mass. I like to think of the ball on the trampoline analogy. Is dark energy, basically negative pressure, be caused by the natural curvature of spacetime?
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pmb_phy said:What General Relativity actually says is that the presence of a gravitational field can be produced by a change of coordinates, even in flat spacetime. This is so in a uniform g-field for example.
pmb_phy said:What General Relativity actually says is that the presence of a gravitational field can be produced by a change of coordinates, even in flat spacetime.
Dark energy is a theoretical form of energy that is thought to make up about 70% of the universe. It is believed to be responsible for the acceleration of the expansion of the universe, and its existence is inferred from the observed behavior of galaxies and other celestial objects.
Dark energy is thought to be the cause of the accelerated expansion of the universe, which in turn affects the curvature of spacetime. The more dark energy there is in the universe, the more accelerated the expansion and the more curved spacetime becomes.
The primary evidence for dark energy comes from observations of the large-scale structure of the universe, such as the distribution of galaxies and the cosmic microwave background radiation. These observations suggest that there is something causing the expansion of the universe to accelerate, and dark energy is the most commonly accepted explanation.
No, dark energy and dark matter are two different concepts. Dark matter is a type of matter that does not interact with light and is thought to make up about 27% of the universe. Dark energy, on the other hand, is a form of energy that is thought to make up about 70% of the universe and is responsible for the acceleration of the universe's expansion.
As of now, there is no known practical use for dark energy. It is a theoretical concept that has not been fully understood or harnessed by scientists. However, ongoing research and experiments may lead to a better understanding of dark energy and its potential applications in the future.