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van gogh
- 22
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can anyone explain how universe will end
I think he meant that the pressure of the vacuum due to the cosmological constant is equal to the negative of its density (x c2); it is three times as big (and the reverse sign) as the pressure of a photon gas of equivalent density.A cosmological constant with the right sign makes the energy density of the vacuum positive, but makes its pressure negative - and 3 times as big.
I don't know if it's exactly a subset--the Big Rip scenario says that the expansion rate goes to infinity in a finite time, which is a type of final singularity (though different from singularities with infinite density obviously).Chronos said:We will all be dead, so who cares? Seriously though, Harmony gives the three basic options [the Big Rip is a subset of eternal expansion].
Inflationary theory predicts the universe should be extremely close to flat.Chronos said:What is truly curious is how close the universe appears to being absolutely flat. There is no entirely satisfactory explanation for that apparent fact. It's like a coin flip that lands on its edge.
The most widely accepted theory is the "Big Crunch" where the expansion of the universe will eventually reverse, causing all matter and energy to collapse back into a singularity.
It is currently impossible to predict the exact timeframe of the universe's end. Some theories suggest it could happen in trillions of years, while others propose it could happen much sooner.
While the "Big Crunch" is the most widely accepted theory, there are other proposed scenarios such as the "Big Rip" where the expansion of the universe continues to accelerate until everything is torn apart.
It is highly likely that any scenario for the end of the universe would have significant impacts on Earth and humanity, potentially causing our extinction. However, the exact effects would depend on the specific scenario.
As of now, there is no known way to prevent the end of the universe. However, with continued scientific advancements, it is possible that we may discover new ways to prolong the lifespan of the universe.