Everything in our universe was created in our universe, by our universe. The bigger question is, what, if anything, created our universe. If there is a “why” to our existence, it probably can’t be answered by observing our universe. For that, we need to know what, if anything, preceded the Big Bang.
Our universe is the observable region of space and time that contains all the matter and energy we can detect or interact with. The Big Bang started the expansion of our universe from a hot, dense state ~13.8 billion years ago. Understanding how and why our universe came into existence is one of the fundamental questions in cosmology.
But answering this question isn’t easy, because we have very little information about what happened before the Big Bang, or even if the concept of “before” makes sense in this context. The Big Bang is the singularity where the laws of physics break down and become unpredictable. Anything that preceded the Big Bang is beyond the reach of our current observations and theories, and may remain so forever.
Some physicists have proposed models of how our universe may have come to be before the Big Bang, based on extensions of our existing knowledge. For example, some models suggest our universe was created by a quantum fluctuation in a larger multiverse (with different physical properties). Other models suggest our universe was born from a previous universe that underwent a contraction and bounce (the Big Bounce), driven by exotic forms of energy or gravity. There are other models, but no model has been conclusively confirmed or ruled out by empirical evidence.
To test these models, we’d need to develop new ways of observing and measuring the early universe, like detecting gravitational waves (ripples in the fabric of space and time), caused by the movement of massive objects. Gravitational waves could carry information about the conditions and events that occurred near the Big Bang, and possibly before it.
We’d also need to develop new theories of quantum gravity (combining the principles of quantum mechanics and general relativity). Quantum gravity could reveal the nature and structure of space and time at the Planck scale (the smallest possible unit of measurement).
We may never know for sure what happened before the Big Bang, or if there was a reason for it, but we can still try to find out as much as we can, using the best tools and methods known to science.
But, I’m not holding my breath. I don’t need to know “why” we exist. I just want to know if a harp will be in my post-mortal state of existence. If so, I should start taking harp lessons.