You need to demonstrate this. It is not obvious and some physics theories disagree.
The Greeks already did that. And still those theorists make off with nothing to stuff away in their pockets!
I stated the proposition the way I did because I was reminded of lyrics of the Rogers and Hammerstein song, "Something Good" from the "Sound of Music". Of course I cannot demonstrate a universal negative, in the way I phrased it, but the real issue is whether or not something can come out of absolute nothing, and the metaphysical intuition is that a negative answer seems obvious. Universal empirical observation indicates the same, as far as I know. If you were playing at the world championship of poker science and metaphysics, and you had to bet on it, which proposition would you bet is the more plausible truth?
I not sure to which physics theories you are referring, but I doubt whether they can validly contradict the causal principle. Alamo-Girl alluded to it. It can be expressed in the syllogism that
Whatever begins to exist has a cause.
The universe began to exist.
Therefore, the universe has a cause.
Cordially,