I don't have any physics background (except the material we did in high school-long time ago).
I was watching a documentary with Stephen Hawking about whether God created the Universe and I could not follow one of the arguments.
Note: This is not a theological question. I am not trying to determine if the conclusion about God is right or wrong, I am trying to understand the argument from the physics perspective.
One of the arguments (at least as much as I was able to understand it) was that:
For each positive energy in the universe (plannets etc) there is an equal negative energy. So the sum of both adds up to nothing. As a result there is no need for a God.
To make the argument more clear, the following analogy was presented:
A man on a flat area of sand or dirt wants to make a hill. So the man starts to dig and pile up the sand (or dirt) which is increasing and piling up as a hill.
In the end a hill has been created BUT at the same time a hole has also been created taking equal space as the hill in the oposite direction.
In this example it is clear that both do add up to nothing since if you reverse the process then you return to the original flat area.
What I can not understand are the following:
How can in the analogy and in reality things add up to nothing?I mean in the analogy with the pile of sand(dirt) the hill and the hole don't add up to nothing since you always have the original flat area with sand you started with. So how is this starting state ignored and it is stated that the 2 opposite forms add up to nothing? Why is the original flat area of sand which is a prerequisite for the existence of both the hole and the hill being ignored?
If someone could help me understand these, but explain it in layman's terms (as I have no physics background) it would be much appreciated.