What is meant by physical existence. For example does love exist?
Not as an entity with physical extension. You could say that there are actions which proceed out of love that have physical extension, if you wished.
If you wanted, you could even follow Aquinas and say that what we ascribe to God as ‘love’ is real (although again, not physical), and therefore, ‘love’ is eternal and not part of the physical universe. Or, again following Aquinas, you could claim that what we call ‘love’ in humans is not identical to what we call ‘love’ wrt God, and therefore, ‘love’ (as humans experience it) comes into existence with the creation of humans, and therefore, is not eternal, per se. (Again, though, we wouldn’t say it’s ‘physical’, strictly speaking.)
Nevertheless, this doesn’t seem to be relevant to the conversation at hand.
Your question is problematic because it does not define an instant of time and it does not say how or why the universe is coming into existence and not just continuing in existence.
The “instant of time” is the creation of the physical universe.
The “how” of creation is God.
The “why” of creation – as opposed to eternal existence – is that the physical universe is
contingent, not
necessary, and therefore, must have a creator.
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