While I do not agree with the Multiverse hypothesis which is I find to be potentially unfalsifiable as each universe is causally disconnected, it is not "
unobservable, untestable, and beyond the realm of empirical science" as trotted out by ignorant creationists.
Firstly the hypothesis is built around eternal inflation where each bubble universe including our own is formed using a quantum field theory as described in this post.
I have a question about your post. We are speaking of the "beginning of our universe - specifically the "Big Bang Theory". My expertise ends at The Big Bang Theory being one of my favorite shows, so forgive me if my question seems silly. @PeterDona mentioned the law of thermodynamics (I...
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Secondly bubble universe collisions are theorized to be common on a global scale (the scale on which bubble universes are formed), the question arises if our own universe has experienced such collisions. If so these collisions should leave circular or disk-like anomalies in the CMB (cosmic microwave background) temperature map, localized temperature gradients that are not predicted by the standard model and breaks in statistical isotropy, potentially seen as 'cold spots' or asymmetries.
One such candidate is the 'CMB cold spot' but the consensus this is a due to a supervoid in our universe.
Collisions with our universe leaving evidence would require our universe to be less than 300,000 years old while the probably of such collisions is debated in the science community.
Study | Estimated Observable Collision Probability |
---|
Aguirre, Johnson, and Shomer (2007) | Low, but not zero—collisions possible if nucleation rate is high and inflation duration is short |
Freivogel et al. (2009) | Observable collisions likely only if inflation duration in our bubble is finely tuned |
Kleban et al. (2011) | Expected number of observable collisions: ~0.1 to a few (order of magnitude) under favorable assumptions |
I'm prepared to be skeptical on the science and the evidence presented, not make blanket comments like the multiverse is unobservable, untestable, and beyond the realm of empirical science because it clashes with one's interpretation of the Bible.