I just provided you with one.
A universe whose curvature is zero is necessarily infinite.
What is the Shape of the Universe?
All measurements made so far support this conclusion.
No infinite space implied infinite physical and material space. It will be composed of vanilla physical things i..e space-time-matter-energy. No non-physical stuff.
You are confused. Infinity is not some mystical concept. It simply means that space goes on forever in any direction. An infinite and flat universe is actually the
simplest way a physical universe can be. One does not have boundaries and hence does not need boundary conditions. It will be completely symmetric as all points in space are equivalent, while for bounded flat space some points will be closer to the edge than other, braking symmetry. The laws of physics absolutely depend on symmetry and equivalency of all points in space and hence a flat universe simply has to be infinite.
A finite universe has to be spherical to do the job, which means curvature of space must be positive, and so far its zero.
The universe is indeed going to expand forever, in fact the rate of expansion of the universe is accelerating and will exponentially increase with time. In what is called the heat "death" of the universe, the universe will expand so much that all matter and energy will dilute away and only space-time will be left that will go on expanding and expanding endlessly. Calling it death will be a misnomer everything in it continues to exist forever, just it becomes more and more dilute. It is going to expand forever because empty space has an inherent energy in it whose impact, according to General Theory of Relativity and confirmed by observation, is to continually exert a repulsive pressure on space and hence stretching or expanding it at ever increasing rates.
What happens as the universe expands? | The Naked Scientists
WMAP- Fate of the Universe
Space is infinitely compressible and/or stretchable depending on the pressures exerted upon it by various energy fields. Again this is according to well established laws of General Relativity. Gravity tries to compress space, while certain scalar fields (inflaton field and dark energy of space) tries to stretch it. See more here,
Metric expansion of space - Wikipedia
Let me emphasize..all of this is based on very well established laws of physics validated through countless experiments ( detection of gravity waves from colliding black holes that momentarily stretched and compressed space is the latest example).
So however non-intuitive it seems, this is what reality is truly like. None of this is speculative at all.
Again it always existed. It can stretch and compress, but creation of space is impossible (as far as we know).
Correct
No.
it always existed. You are artificially using an absurd language. That which exist eternally was never created nor ever destroyed. When you say that your God is eternal, does that mean He created Himself? Same for the universe , or the physical reality of an eternal existence through endless and beginning-less time.
There are no absurdities. Your mind is creating absurdities where none exist for it wants to reject a something it finds upsetting. This is what happens when people are set in their ideologies and locked into certain modes of thinking.