Constructing Covariant Actions for Quantum Gravity with a Unique Vacuum
Published:Dec 31, 2025 16:45
•1 min read
•ArXiv
Analysis
This paper addresses the ambiguity in the vacuum sector of effective quantum gravity models, which hinders phenomenological investigations. It proposes a constructive framework to formulate 4D covariant actions based on the system's degrees of freedom (dust and gravity) and two guiding principles. This framework leads to a unique and static vacuum solution, resolving the 'curvature polymerisation ambiguity' in loop quantum cosmology and unifying the description of black holes and cosmology.
Key Takeaways
- •Addresses the vacuum ambiguity problem in effective quantum gravity.
- •Proposes a constructive framework for formulating 4D covariant actions.
- •Ensures a unique and static vacuum solution.
- •Resolves the curvature polymerisation ambiguity in loop quantum cosmology.
- •Unifies the description of black holes and cosmology.
Reference
“The constructive framework produces a fully 4D-covariant action that belongs to the class of generalised extended mimetic gravity models.”