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Souhardya Nandi
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This may sound like a noob question but please help me out guys.Will universal acceleration ever retard ? And if it continues to accelerate for all eternity, where is it getting this never ending energy from ?
That was helpful. Thanks. However, what about the energy required for continuous expansion ?kimbyd said:As for whether the acceleration will slow, nobody knows at present. If the cause of the expansion is some kind of dynamical field that does dilute slowly as the universe expands, then yes, the acceleration will slow. If it's a cosmological constant, then the acceleration will never slow: it will approach a constant value.
Did you not understand mfb's answer? He addressed that issue specifically.Souhardya Nandi said:That was helpful. Thanks. However, what about the energy required for continuous expansion ?
Sorry. Actually I misplaced my question. Let me reframe my question. He gave 2 possible causes of this energy. I wanted to know which is consistent with the latest observations and models ?phinds said:Did you not understand mfb's answer? He addressed that issue specifically.
Sorry again. Oh yes. I understood mfb answer. Did not spot it at first. Thats why. Never mind. Ignore this subsequent question.Souhardya Nandi said:Sorry. Actually I misplaced my question. Let me reframe my question. He gave 2 possible causes of this energy. I wanted to know which is consistent with the latest observations and models ?
Both would be. You'd only notice a difference after cosmological timescales. If some energy pool exists that's slowly draining away, it could be trillions of years before it drains away by a noticeable amount. For all practical purposes, we assume the energy amount is constant. It will depend on whatever formulation we come up with for dark energy.Souhardya Nandi said:Sorry. Actually I misplaced my question. Let me reframe my question. He gave 2 possible causes of this energy. I wanted to know which is consistent with the latest observations and models ?
And we're not even 100% sure that it even happened, although if it didn't we're going to have to come up w/ some other explanations for other things.newjerseyrunner said:In the first few moments of the universe, it expanded ridiculously fast in a process called "inflation." Inflation though, stopped very quickly, and nobody is sure what it was or why it stopped.
The current scientific consensus is that the acceleration of the expansion of the universe will continue to increase, rather than decrease. This is due to the presence of dark energy, a mysterious force that is thought to be responsible for the expansion of the universe.
Several lines of evidence support the idea that the acceleration of the expansion of the universe will continue to increase. For example, observations of distant supernovae have shown that the expansion of the universe is actually accelerating, rather than slowing down. Additionally, measurements of the cosmic microwave background radiation and the distribution of galaxies also support this idea.
While it is theoretically possible for the acceleration of the expansion of the universe to reverse, it is highly unlikely. This would require a significant change in the underlying laws of physics, which is not currently supported by any evidence. Additionally, the continued presence of dark energy would likely prevent such a reversal from occurring.
At this point, it is impossible to accurately predict how long the acceleration of the expansion of the universe will continue. This is because the properties of dark energy are still not fully understood, and it is not clear how long it will continue to drive the expansion of the universe. Ongoing research and observations may provide more insight into this question in the future.
The "Big Rip" is a theoretical scenario in which the expansion of the universe accelerates to the point where it tears apart all matter and even space itself. While it is currently not possible to rule out this possibility entirely, most scientists believe that the acceleration of the expansion of the universe will not reach this extreme level. Instead, they predict that the expansion will continue at a steady rate, eventually resulting in a "heat death" of the universe.