Friend Kirk Durston asks because:
It is very important for a physicist, especially when addressing a lay audience, to clearly distinguish between a mathematical model and the real world. It is simply false that the universe is eternal because we can build a mathematical model of an imaginary eternal universe. The fatal flaw in invoking mathematical models and theorems that describe a universe with an infinite past, where time t actually proceeds from minus infinity toward plus infinity, is that when applied to reality, every second of that actual countable infinite series must have actually occurred before we get to this particular time t now. More.
See also: Kirk Durston: Cosmologist Sean Carroll simply asserts “a conclusion with no supporting argument”
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