It's a convenient axiom for many purposes, but contradicts the Big Bang hypothesis and its supporting observations.
How does the BB contradict 'can't get something from nothing'?
Its possible that the matter of the BB came from outside spacetime.
Indeed, even the zero-energy universe hypothesis requires a seed of matter - from outside of spacetime.
QuoteAlso nothing permanent can exist in time - 2nd law of thermodynamics.I think not
Everything in time withers and dies, or wears away or decays. Something permanent is required. I don't believe anything is permanent in time.
Anyway, I'm personally convinced that time must have a start:
All systems require an initial state else there are no subsequent states.
The universe is a system - so it requires an initial state - the start of time.