Thanks to both of you. In the scenario you describe, and please forgive my very general familiarity with physics, are phenomena that occur without an observable cause.
Notice that the unobservable nature of an uncaused cause, would mean that the immediate effect would appear as if the effect was caused by nothing.
I got started down this rabbit hole many years ago, with a version of the ontological argument that proves a necessary being due to the impossibility (or contradiction) of positing the existence of nothing (or non-being).
Later I completed an undergrad in philosophy, so I’m slightly more competent in that realm.
And it’s been a curious thing to watch the reaction of physicists in recent years when asked if there can be an infinite number of objects in space.