I'm gonna try for an infinite past universe.
For analogy, think of negative tempurature. It is hotter than *all positive tempurature*. So there is an infinite amount of tempurature that is "colder" than it.
We place an order on events. There are events before, and events after. If we can make a consistent ordering of events such that an infinite number of events happen "before", then we have this model.
Now, all of the events *before* where causally connected to the now, things get bad. But why do they have to be?
Imagine a causal disconnection of a chain of events past a certain point. (For example, something falling into a black hole; what happens within the black hole is causally disconnected from what happens outside). If you can causally disconnect one chain of events from another, and label it *before*, and have that causally disconnected sequence of events be unbounded, you can have a date of omega+400 or whatever.
Now, justifying that those events are *before* is more than a bit tricky.
In the black hole case (where only a finite sequence of events occur in the causally disconnected "in black hole" event sequence), the events within it all happen "before" the black hole evaporates. And the events outside can be "after" the black hole evaporates. So despite being disconntected, we can reasonably argue they are *ordered*.
A: rocket ship outside black hole.
B: rocket ship crosses event horizon.
C0: pilot in rocket ship does a polka, inside event horizon.
C1: someone outside eats a donut
D: black hole evaporates due to hawking radiation.
E: the universe's greatest novel is written
Now C0 is causally disconnected from C1, D or E, but "obviously" it happens "before" D, and E happens "after" D.
All we now need is a way for a similar situation, but the events in C0 to be unbounded time-wise, yet still happen "before" D.
One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision - BRLast edited by JHVH on Fri Oct 23, 4004 BCE 6:17 pm, edited 6 times in total.