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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…
gr-qc2025
Particle Production by Time-Varying Dark Energy and the End of Cosmic Expansion
Nicolas Patino, Paul J. Steinhardt
We consider various possible consequences of time-varying dark energy due to a quintessence scalar field whose energy density is partially converted to particles as the field evolv…
gr-qc2025
Instant Folded Strings, Dark Energy and a Cyclic Bouncing Universe
Nissan Itzhaki, Uri Peleg, Paul J. Steinhardt
We present a wholly self-consistent, complete cyclic bouncing cosmology based on components drawn from string theory and constructed in a way that is under perturbative control thr…