The universe came from nothing - this is how today's cosmologists describe our universe's origin. Why do they think that the uni...
The universe came from nothing - this is how today's cosmologists describe our universe's origin. Why do they think that the universe came from nothing? Because the universe looks like has zero energy. That is a strange statement. When we look around, we see energy, interactions, change, and movement everywhere. However, as the physicists state: all the energy what the matter and its movement represent compensated by the gravitational energy which is acts as opposite-signed energy. The universe has zero energy - as we know it today - so it could come from nothing. This nothingness is a disturbing thought. How is something from nothing?
As the universe has zero aggregated energy, it may come from nothing. What is this nothing? Is it a real nothingness, an absolute nothing, or something else? Moreover, if it is something else, how can something be nothing?
We should distinguish between absolute nothingness and physical nothingness. Absolute nothingness really means nothing, where nothing is there or exists. We do not know what universe-like nothingness is, but the universe may do not come from this kind of absolute nothingness. If the universe came from nothing, that nothingness must be a different kind of nothingness. A different kind of nothingness must exist, it is the physical nothingness.
What is physical nothingness? What is the difference between absolute and physical nothingness? The absolute nothingness is where absolutely nothing exists. Physical nothingness is a different thing. It allows something to exist.
How can something be nothing? What kind of physical system can act like nothing? Most of the physical systems are complex systems. The complex means in this case, that the system has different components, which are interacting with each other in many different ways, and creates various states of the system. That is the typical physical system. However, what if a physical system does not have different states? What if its state is the same everywhere? It may have different parts, but all the parts are in the same state. This kind of system can act like nothing. How?
An outside examiner could see this system as something, but only because it is seen from outside, from a different state. However, what could "see" an inside examiner? It would see nothing. Every part of this system - including the examiner - is in the same state. An inside examiner cannot see any difference of the system. This kind of system acts like nothing for all that exists inside this system. The same state requirement does not even mean that the system cannot change its state, but it requires that the change of the state must be global for the whole system. Intentionally did not mention the time in this changing case, like: the system may change its state in time. Time does not exist in this system either. Only an outside examiner could see and record the changes as it is happening in time, but an inside examiner cannot record the changes either because everything is in the same state, even if the state is changing. This is a nothing-like something.
This physical nothingness state of a system must be distinguished from a system, which is in thermodynamic equilibrium. At first sight, the two types of systems have similarities. However, the thermodynamic equilibrium, the heat death of the system differ from the physical nothingness of the system by the way, that the thermodynamic equilibrium does not require that the system must be in the same state everywhere. Thermodynamic equilibrium allows small local differences in the system if these differences equalize each other. The physical nothingness state does not allow that.
In this aspect, what the universe from nothing means? It does not mean absolute nothingness, but it means physical nothingness, the universe-like nothingness, where the whole universe is in the same state everywhere down to its smallest elements. This same state could, or even must change globally. Why? Because otherwise no potential possibility to break out from this state. If the whole system is in the same but changing state, this system may break out from this synchronized-changing state, a spontaneous desynchronization may occur. And something would be born from nothing. This spontaneous desynchronization could break the synchronous, may be called the quantum state, and this phase-change could disengage energy. And our universe could be born. A universe from nothing.
Are this universe-like nothingness, and the matter, which is capable of being in this state actually can exist? It is a theoretically possible quantum state. What kind of a matter of? It may be called quantum foam, Higgs field, etc. Or maybe it could be called the grid field, according to the grid model.
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