Big bounce theory in light of the closed Universe finding

In summary, the new evidence suggests that a closed universe may be the most likely explanation for the data we have collected thus far. If confirmed, this would bring back the Big Bounce as a possible hypothesis for the evolution of the universe. This has long-term consequences being that the Big Bounce results in cyclic Big Bangs, since the expansion of the universe is not permanently accelerating, as once thought.Currently, it is too early to say how this new evidence will play out, but it is definitely exciting nonetheless.
  • #1
user30
96
11
TL;DR Summary
The Big Bounce theory has seen a resurgence in light of the Plank evidence of a closed universe. Which type of cyclic universe would it most likely point to?
As you all know:

Planck evidence for a closed Universe and a possible crisis for cosmology

https://www.nature.com/articles/s41550-019-0906-9

If confirmed, it would bring back the Big Bounce as a possible hypothesis for the evolution of the universe. This has long-term consequences being that the Big Bounce results in cyclic Big Bangs, since the expansion of the universe is not permanently accelerating, as once thought.

What I'm curious about is, which model would best fit the model - eternal return or differentiated Bing Bangs? That is to say same histories or different?

Here is some overview of the Big Bounce hypothesis.
https://en.wikipedia.org/wiki/Big_Bounce
 
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  • #2
I'll add: This is from a threadmaker who has been speaking of the Big Bounce and the cyclic universe in opposition to the status quo and accelerating universe, not at all convinced our data is all that meets the eye. As you all can imagine, I am more than excited by these findings. :smile:

Let's see if it sticks, too...
 
  • #3
It's all guesswork at this time. There doesn't seem to be any observational evidence to distinguish theories.
 
  • #4
mathman said:
It's all guesswork at this time. There doesn't seem to be any observational evidence to distinguish theories.

Then the field is dead by your estimation. Science withour falsification is pretty meaningless.
 
  • #5
FWIW

"Alternative pictures including a Big Bounce may provide a predictive and falsifiable possible solution to the horizon problem, and are under active investigation as of 2017.[1]"
 
  • #6
user30 said:
are under active investigation

Yes. But it is too early to tell how all this will turn out. The Planck evidence itself is still being reviewed and might turn out not to imply what some are saying it implies.

In short, this area is in too much flux right now for us to say anything definitive. Thread closed.
 

1. What is the Big Bounce Theory?

The Big Bounce Theory is a cosmological model that suggests the universe goes through cycles of expansion and contraction, rather than a single Big Bang event. This theory proposes that the universe was once in a contracted state before expanding, and will eventually contract again in a "big crunch" before bouncing back into a new expansion phase.

2. How does the closed Universe finding impact the Big Bounce Theory?

The discovery of a closed Universe would support the concept of a cyclical universe and provide evidence for the Big Bounce Theory. A closed Universe is one in which the curvature of space-time is positive, meaning that the universe will eventually collapse in on itself. This aligns with the idea of a "big crunch" in the Big Bounce Theory.

3. What evidence supports the Big Bounce Theory?

Some evidence for the Big Bounce Theory comes from the cosmic microwave background radiation, which shows a pattern of temperature fluctuations that could be explained by a previous contraction phase. Additionally, the theory is supported by mathematical models and simulations that suggest a cyclical universe is possible.

4. How does the Big Bounce Theory differ from the Big Bang Theory?

The Big Bang Theory proposes that the universe began with a single event, the Big Bang, and has been expanding ever since. The Big Bounce Theory, on the other hand, suggests that the universe has gone through multiple cycles of expansion and contraction. Additionally, the Big Bounce Theory does not require the existence of a singularity, as the universe would not have a beginning or an end.

5. Can the Big Bounce Theory be proven?

At this time, the Big Bounce Theory is still a theoretical concept and has not been proven. While there is some evidence that supports the idea, more research and observations are needed to fully validate the theory. Additionally, the concept of a cyclical universe is still a topic of debate among scientists, and there are other competing theories that offer different explanations for the origins and fate of the universe.

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