A quick search reveals:
Why is there no sound in space?
Sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound. ... Radio is a form of electromagnetic radiation just like light and can therefore travel through the vacuum of space just fine.
The Bible says that God said. or (amar in Hebrew) amar means: to say, to answer, to say in one's heart, to think, to command, to promise, to intend, so take your pick.
I do not think it is a case of 'take your pick'. If you were to pick "to say" in that instance, it would imply that The Creator was bigger than the Universe but had vocal chords
But the point of Genesis 1:1 is that God existed before the universe.
The point of this thread is to explore the idea of sound creating the Universe. In that - it focuses on Genesis 1:3
So how do waves propagate outside our universe?
The OP assumes the interest in waves propagated
within the universe - specifically creating the Galaxies through some type of sound.
And string theory is an interesting theory along with quantum field theory which says that mass is created by quantum fields that permeate the universe. That would also be in the form of waves.
It might be that mass is created off of the Quantum Field. I see no reason as to why that has to be pluralized as my understanding is that Quantum particles at their source - while many, are all one and the same. It is only when they vibrate at certain frequencies that they become certain types of mass.
What is also interesting is that quantum fields create an infinite matrix.
Quantum fields are the quantum theoretical generalizations of classical fields. The two archetypal classical fields are Maxwell's electromagnetic field and Einstein's metric field of gravitation. ... In a quantum field theory, what we perceive as particles are excitations of the quantum field itself. [LINK]
I think that the QF can be imagined initially as an infinite inert medium which was excited by vibration and is now in excited in various trillions of points [Galaxies] each also containing billions of points [stars etc] and the Galaxies are perhaps misidentified as being in "QFs" implying that somehow each QF is different/separate from the other, rather than seeing that it is really the one QF. [Quantum Entanglement.]
So everything is made from a wave function.
Which is most often associated with sound.
So the Bible is correct if we interpret God speaking causing waves in the quantum field which created matter.
In the case of the OP, the argument is that the 'speaking' The Creator did, was specifically, "to think the Universe into existence." and that this thinking continues [has not stopped - still goes on] based upon the evidence that the Universe relative to itself, is only still in the initial stages of its forecasted life-span.
This can even have a deeper meaning. God's very voice created the quantum fields that make up all of the matter in which we see.
Unless that 'voice' was really a thought, which would mean that the QT acts as a mind-screen and is an aspect of The Creators Mind, rather than something which was created from or through a source external to The Creator.
Given the evidence, it is logical to assume the 'voice' is The Creators internal thought(s) rather than there actually exist some unbelievably bigger than the Universe, entity with a form which acts as an apparatus in order to produce external sound.