Questions about Multiverse and beyond

[youngkiwi]

Somewhere I read Stephen Hawking’s words: “there is 98% chance that another Big Bang could happen and create another universe”. (meaning only) This makes the multiverse possible.

When there is one, there is another one, naturally there should have unlimited number of universes exist and there should have number of “neighbouring universes” around our ones.

Our universe is expanding now. Ultimately our universe would start shrinking or contracting. I imagine that the neighbouring universes are doing the same either expanding or shrinking right now. (I can not imagine that they are doing nothing at the moment).

To make something to expand or shrink there must have some kind of energy or force to drive it.

My Questions are:

1. What is the force to drive the universe to expand?

2. Is gravity the only force to make universe to contract?

3. How could the gravity, as a very weak force, to make the Big Crunch to start, where it has only 1-2% of the mass in the universe?

4. Where do the force(s) come from and what kind of characters this or these force(s) would have if they do exist?

5. Why does not the universe expand with a uniform speed?

6. Is there anything to do with its neighbouring universes while an universe is expanding or contracting? If there is, why and how?

 

[AndyW]

Hello,

Thank you for sharing your thoughts and questions about the possibility of a multiverse and the forces that may drive its expansion and contraction. I would like to offer my perspective on these questions.

1. The force driving the expansion of our universe is known as dark energy. This is a mysterious force that is causing the expansion of the universe to accelerate. Its exact nature is still not fully understood, but it is believed to make up about 68% of the total energy in the universe.

2. Gravity is indeed the main force responsible for the contraction of the universe, also known as the Big Crunch. However, it is not the only force at play. Other forces, such as dark energy and dark matter, also play a role in the dynamics of the universe.

3. Gravity may seem like a weak force compared to other fundamental forces, such as electromagnetism, but on a cosmic scale, its effects are significant. It is the cumulative effect of gravity from all the matter in the universe that causes the Big Crunch to start.

4. The origin and nature of dark energy and dark matter are still not fully understood. However, scientists are actively researching and studying these phenomena to better understand their properties and role in the universe.

5. The expansion of the universe is not uniform because of the distribution of matter and energy in the universe. Some regions have more matter and energy, which causes them to expand at a faster rate than others.

6. The neighboring universes may have an impact on our universe's expansion or contraction if they are close enough and have a significant amount of matter and energy. However, the exact nature of this interaction is still not known and is an active area of research.

Overall, the concept of a multiverse is still a theoretical idea, and there is much that we do not know about it. However, it is an exciting and thought-provoking concept that continues to inspire scientific research and exploration. Thank you for your curiosity and interest in these complex topics.