In theory unicorns exists too. To talk about anything outside the universe is on the same level. I have no idea nor a position if the universe is eternal or emergent because I have not sufficient data to form a opinion from.
Darkness, silence, Coldness are not found outside the universe, these are real conditions within the universe.
Q. Do you believe the universe is eternal and not emergent?
The fields are the source of the particles which has the kinetic energy we perceive as sound or heat. So if you want to talk about a source it has to be the fields.
Round and round and back; sound/light/heat have a material source.
Q. Can this field produce heat without there being material or must material be there for heat to be produced?
We say dark as the opposition of light. Total darkness is how we describe our perception of the total absence of light. These linguistic models were developed before physics showed us that these concepts aren’t a true representation of reality.
Even if genesis would be a poetic description it still makes certain non-poetic claims about reality which are false. The question about if it is poetic or not can only be answered by the authors. And Augustine and the rest of the commentators had no access to the authors so what they say on the matter is on the level of speculation.
You said darkness is nothing and linguistically, there’s nothing stopping from saying ‘the condition in the room is nothing’, then it will sound as ridiculous as your hypothesis.
Darkness has a meaning, a definition and its importance like i said, it is the framework from which your perception of light is built.
The bible is poetic, the idea that it makes non poetic claims about reality already shows you are already lost in the poetic interpretation. In summary, God created the spiritual, the physical world (which you derive this so called reality from) is a result of sin and sin is nothing more than deception.
Asking the authors of the bible won’t solve anything, they’ll just refer you back to what is said in the bible.