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Are you in the created universe?

2022-12-24 18:42:19Lifestyle SHKRUAR NGA PAUL SUTTER
Are you in the created universe?
Are you in the created universe?

We know that we live in an ever-expanding Universe. This means that the entire universe is getting bigger with each passing day. But it also means that in the past our Universe was smaller than it is today.

If we go back in time, physics suggests that our Universe was once an infinitely small, infinitely dense point, a single body. Most physicists think it expanded during the Big Bang.

Por për shkak se e gjithë fizika e njohur nuk vlen për kushtet ekstreme që mbizotëruan në fillimet e Universit tonë, është e vështirë të thuhet me siguri se çfarë ndodhi në ato momente, më të hershmet e Universit. Për pjesën më të madhe të historisë, Universi ka qenë i mbushur me objekte të ngjashme qiellore siç janë të pranishëm sot, vetëm se ishin thjesht më afër njëri-tjetrit.

Për shembull, kur Universi ynë ishte më pak se 380.000 vite i vjetër, vëllimi i tij ishte rreth 1 milionë herë më i vogël se sa është sot, dhe kishte një temperaturë mesatare prej rreth 9726 gradë Celcius. Pra ishte aq i nxehtë dhe i dendur, sa ishte në fakt në një gjendje plazmike, ku atomet ndahen në protone, neutrone dhe elektrone.

However, we encounter such conditions in many other situations in space and on Earth, so we have a good understanding of how they work. But the further we go, the more complex the physics becomes. When the Universe was only a few minutes old, it was a hot "soup" of protons, neutrons, and electrons, driven by the same physics we use to understand nuclear bombs and nuclear reactors.

However, if we go back even further in time, things get really fuzzy. When we try to understand the Universe when it was less than 1 second old, we have no theory of physics that can handle the insanely high temperatures and pressures that the universe experienced.

All our theories of physics fall down and we don't understand how particles, forces and fields work under those conditions. Physicists can describe the growth of the cosmos using Einstein's General Theory of Relativity, which relates the contents of the cosmos to its expansion history.

But this theory contains a fatal flaw. Because if we follow it all the way, then it turns out that for a finite time in the past, our entire Universe was compressed into a single, infinitely dense point. That moment is known as the "big bang singularity".

The singularity is referred to as the "beginning" of the universe. But he was not like that at all. Mathematically, the Big Bang singularity does not tell us that the Universe began at that exact moment. On the contrary, it is showing us that the Theory of General Relativity itself has collapsed and lost its predictive and explanatory power.

Physicists have long known that General Relativity is incomplete. Since it cannot explain gravity with a large force or on a small scale, known as quantum gravity. Therefore, to fully understand the earliest moments of the Universe, we need a new physics.

Unfortunately, we currently lack something like that. We currently have several hypotheses about quantum gravity, such as String Theory and Cyclic Quantum Gravity, but they have not been fully developed, nor have they been tested. But if either of these theories turns out to be correct, they could tell us interesting things about the early Universe.

In the case of the theory of Cyclic Quantum Gravity, the singularity is replaced by a part of the finite dimensions of space-time. Meanwhile, according to String Theory, our Universe originates from a "landscape" of possible Universes.

It is also likely that our Big Bang exists as just one of an infinite series of Universes, multiplying endlessly into a multiverse. Only further advances in theoretical physics will help untangle these possible ideas.

But there's another problem: we may never know what caused the Big Bang. In the earliest moments of the Universe, even our current concepts of time and space do not apply. On such extreme scales, normal, everyday concepts like "beginning" and "pre-creation" may not make any sense. / "Live Science"


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