Either we live in an unusually under dense region of the universe or our models are wrong ("new physics").
That's quite a strong claim. I'm skeptical. Sources?
> Have physicists looked into this?
They shelved it right next to "God Made The Universe" in the "Unfalsifiable Propositions" section, under the title "Grad Students Made The Universe."
Software engineers presenting weird pseudo science as serious physics is one way this manifests.
I could be wrong.