384 citations · 4.8k across the 89 of their papers we have counts for
89 papers
An Inverse Lyth Bound for Non-Attractor Inflation
William H. Kinney
I present a novel physics result generated entirely autonomously by ChatGPT 5.6 Sol. The Lyth bound relates an observable primordial tensor amplitude to a lower limit on the field…
The BGV Theorem and the Null Convergence Condition
William H. Kinney
We examine the relationship between the Null Convergence Condition (NCC) and the Borde-Guth-Vilenkin (BGV) Theorem. We first show that, for an expanding spacetime foliated orthogon…
Geodesic Completeness in General Cosmological Scenarios
William H. Kinney
The well-known Borde-Guth-Vilenkin Theorem shows that inflationary spacetimes are generically geodesically past-incomplete, necessitating the existence of a pre-inflationary bounda…
The Borde-Guth-Vilenkin Theorem in extended de Sitter spaces
William H. Kinney, Suvashis Maity, L. Sriramkumar
The Borde-Guth-Vilenkin (BGV) theorem states that any spacetime with net positive expansion must be geodesically incomplete. We derive a new version of the theorem using the fluid…
Simple single-field inflation models with arbitrarily small tensor/scalar ratio
Nina K. Stein, William H. Kinney
We construct a family of simple single-field inflation models consistent with Planck / BICEP Keck bounds which have a parametrically small tensor amplitude and no running of the sc…
Cyclic Cosmology and Geodesic Completeness
William H. Kinney, Nina K. Stein
We consider recently proposed bouncing cosmological models for which the Hubble parameter is periodic in time, but the scale factor grows from one cycle to the next as a mechanism…