#big bounce

[paperandpencilsandskips]

which end of the universe scenario is your favorite

heat death

vacuum decay

big rip

big crunch

big bounce (assuming a big crunch doesn't already create a new universe)

Voting ended onMay 10

[erwan-soyer]

Trou noir - en cours

Pages de livres de physique et de biologie issues des archives du CNRS - Pages of physics and biology books from the CNRS archives (French center of scientific research) - 50x50 cm

[mysticstronomy]

WHAT IS BIG BOUNCE THEORY??

Blog #19                                                     Wednesday, September 16, 2020

Welcome back,

Everyone is heard of the Big Bang, the idea that, about 14 billion years ago, the universe emerged from nothingness through some sudden quantum event into an expanding space – time filled with hot matter and radiation. Many know that the Big Bang alone cannot explain the remarkable uniform distributing of matter and energy observed today or the absence of curves and warps that one might expect after sudden quantum event. Now, for the theory that has gained popularity in recent years. The Big Bang theory.

In simple terms, think of the Universe like a lung. Right now we are in a state of expansion, but this theory assumes that said expansion will eventually reach a stopping point. When this happens, a rapid contraction will occur. Once that contraction reaches a small, dense enough point, the whole process will begin again in an “explosive” event similar to the Big Bang.

Under this theory, the mysterious cause of the Universe's rapid expansion was not a singularity or sudden inflation, but rather a bounce. This theory assumes that there have been Universe’s before us that all eventually contract into an infinitely hot, dense cluster that then “bounces” back out.

So, what’s the difference? Well as for the actual expansion of our Universe, the two theories are pretty much the same; it’s all about the cause. Even though the Big Bang’s cause can’t be known for sure, the most popular idea, is that a singularity went through a massive blow up in size during the first few seconds of the Universe’s birth.

Proponents of the Big Bounce theory say that something must have triggered that event. This is where it gets weird. Some scientists believe that as the Universe compressed in on itself to the smallest point it didn’t become a singularity, but rather passed through a singularity and “bounced” outward. Under this theory, there could have been many Universe’s before our own and this is all just one big cycle. However, it could also be true that this is the first and only iteration of the bounce. At the end of the day, there is far more evidence for the Big Bang theory but it’s difficult to prove since we cannot look back that far and see the cause. Expansion of the Universe is absolutely occurring, it’s just a question of the origin.

There may not be much evidence for the Big Bounce theory currently, but researchers and proponents are working to gather that evidence to rival the current theory. It really comes down to whether you think the Big Bang was the start of everything or the end of something. ‌What do you believe? Does the Big Bang theory or Big Bounce theory sound more plausible? Perhaps there was another cause. Let me know below.

COMING UP!!!

(Saturday, September 19th 2020)

“WHAT IS A WORMHOLE??”

[startswithabang]

The Five Ways The Universe Might End

“4.) Dark energy could transition into another form of energy, rejuvenating the Universe. If dark energy doesn't decay, but instead remains constant or even strengthens, there's another possibility that arises. This energy, inherent to the fabric of space today, may not remain in that form forever. Instead, it could get converted into matter-and-radiation, similar to what occurred when cosmic inflation ended and the hot Big Bang began.

If dark energy remains constant until that point, it will create a very, very cold and diffuse version of the hot Big Bang, where only neutrinos and photons can self-create. But if dark energy increases in strength, it could lead to an inflation-like state followed by a new, truly hot Big Bang once again. This is the most straightforward way to rejuvenate the Universe, and create a cyclic-like set of parameters, where the Universe gets another chance to behave like ours did.”

Based on the best knowledge and data that we have today, it’s clear that the Universe isn’t just expansion, but the expansion is accelerating. Does this determine the fate of our Universe unambiguously? If we extrapolate what the data indicates about dark energy into the future, we fully expect that structures (like our local group) that are gravitationally bound today will remain so into the future, but that larger-scale structures which are unbound (like our supercluster, Laniakea) will eventually dissociate. But extrapolation is tricky, and assumes that dark energy doesn’t change over time.

If we allow the possibility of change, though, many more possibilities arise. Here are the five most likely, and how we’ll distinguish between them!

[danxiously]

oh ... yknow

[futureprof09]