Can we live in a baby universe formed by a delayed first-order phase transition?
Abstract
We examine the idea that our Universe began as a baby universe and show that this is feasible in a gauged U ( 1 ) B − L extension of the Standard Model with the classically conformal principle. For the first time, we define a measure to describe the probability that we reside in a baby universe, and find that it can be close to 1 in a considerable portion of the parameter space. The framework is consistent with current cosmological data, and it predicts the existence of a heavy neutral gauge boson, which could be detected at colliders, thereby offering a direct link between early universe dynamics and experimentally testable signatures at the TeV scale.
Fields of Study & Subjects
Origins and Evolution of Life
Lipid Membrane Structure and Behavior
Ecosystem dynamics and resilience
Publication details
- Journal / source
- Physical review. D/Physical review. D.
- Publisher
- American Physical Society (APS)
- Volume
- 113
- Issue
- 5
- Publication date
- 13 February 2026
- Language
- EN