2 papers
gr-qc2026
Anti-Ultralocality and Plateau Models of Inflation
Joshua Shterenberg, David Garfinkle, Anna I. Rosenzweig +2
Anti-ultralocality refers to the growth of spatial gradient terms relative to velocity terms in the coupled Einstein--scalar field equations. It is a characteristic feature of dece…
gr-qc2026
Causal Horizons, Geodesic Completeness and Stability in Slow Contraction Cosmology
Mariam Khaldieh, Anna I. Rosenzweig, Paul J. Steinhardt
We show that cosmological models with a semi-infinite phase of slow contraction (ekpyrosis) possess a combination of properties that can address several fundamental problems in cos…