“Our whole universe was in a hot, dense state . Then nearly fourteen billion years ago expansion started, wait”
The Big Bang theory has long reigned as the predominant explanation for the origin and evolution of the universe. This theory postulates a dramatic explosion that birthed the universe approximately 13.8 billion years ago. However, science is a field that thrives on exploration and innovation, and as such, it’s essential to consider alternative theories to the Big Bang. In this article, we’ll explore six intriguing alternatives that challenge the conventional wisdom.
Before we dive into these alternative theories, let’s examine the evidence that supports the Big Bang theory. Cosmologists have made certain key assumptions. They believe that the laws of physics are constant throughout the universe, that the cosmos is homogeneous, and that our observations aren’t biased by our specific position within the universe. These assumptions have allowed the Big Bang theory to explain a myriad of characteristics and properties of the universe.
But, what if these assumptions are flawed? Could it be possible that the Big Bang never actually happened?
1. Steady State Theory
One alternate theory of the development of the universe is the Steady State model. Emerging as one of the first opponents to the Big Bang theory, Steady State postulates continuous creation of matter all over the universe to explain its discernible expansion. This kind of universe would be infinite, and it wouldn’t have a beginning or an end. Be that as it may, the abundance of evidence and data collected since the mid-1960s successfully disproves this theory to this day.
2. Bouncing Cosmology
Better known as the Big Bounce theory agrees with the accelerated expansion of the universe proposed by the Big Bang theory. However, the Big Bounce states that the universe has been subjected to a state of expansion and compression, one after another recurrently, bouncing each time it contracts to a certain volume. Some suggest that the universe only bounced once. In this model, the cosmos had been shrinking before the bounce, since the innumerable past, and it will expand for the rest of the time.
3. Eternal Inflation
Another interesting alternative is the Eternal Inflation theory. Following the Big Bang, the universe expanded rapidly during a short period called inflation. The Eternal Inflation theory, on the other hand, presupposes that inflation never stopped, but continued to happen for an infinite timespan. Out there, somewhere, even today, new universes are being created in an immense complex called the multiverse. What is more, those numerous universes could have quite different physical laws from the ones we know.
4. The Cyclic Model
Also known as the Oscillating model of the universe implicated an endless streak of Big Bangs, later on accompanied by Big Crunches that reignited the cycle, perpetually. The Steinhardt–Turok cyclic model includes two parallel orbifold planes (also known as M-branes) that collide at intervals in a higher-dimensional space. In this theory, the discernable four-dimensional universe rests on one of these branes.
5. The Black Hole Theory
The Black Hole theory says that our universe came from a black hole of another universe. Therefore, we are living outside its event horizon. In an alternate version of the theory, the observable universe is the inside of a black hole subsiding as one of potentially many within a larger parent universe, or multiverse.
In this respect, we can claim that a new universe lies behind every black hole. Given that we cannot pass the event horizon of a black hole, there is no way to clearly prove or disprove this theory.
6. Merely a Simulation
Some intriguing ideas found in string theory and quantum gravity propose that the universe might be a mere illusion. According to this line of thought, our universe could be a flat hologram projected onto a spherical surface or even a digital simulation running within a colossal cosmic computer.
While the Big Bang theory is currently the most widely accepted explanation for the universe’s development, it’s essential to remember that scientific knowledge is continually evolving. What was once considered pure fiction has often become common knowledge. The exploration of alternative theories to the Big Bang is a testament to the ever-curious nature of science, reminding us that there is always room for new and groundbreaking discoveries in our understanding of the cosmos.