41 citations · 70 across the 6 of their papers we have counts for
6 papers
Eternal Universes
Damien A. Easson, Joseph E. Lesnefsky
We consider the possibility of a past and future eternal universe, constructing geodesically complete inflating, loitering, and bouncing spacetimes. We identify the constraints ene…
Inflationary resolution of the initial singularity
Damien A. Easson, Joseph E. Lesnefsky
The inflationary paradigm has transformed our understanding of the early universe; yet most inflationary models are considered geodesically past-incomplete, suggesting a beginning…
On the past-completeness of inflationary spacetimes
J. E. Lesnefsky, D. A. Easson, P. C. W. Davies
We discuss the question of whether or not inflationary spacetimes can be geodesically complete in the infinite past. Geodesic completeness is a necessary condition for averting an…
Maximizing the hyperpolarizability of 1D potentials with multiple electrons
Christopher J. Burke, Joseph Lesnefsky, Rolfe G. Petschek +1
We optimize the first and second intrinsic hyperpolarizabilities for a 1D piecewise linear potential dressed with Dirac delta functions for non-interacting electrons. The optim…
Optimizing the second hyperpolarizability with minimally-parametrized potentials
Christopher J. Burke, Joseph Lesnefsky, Rolfe G. Petschek +1
The dimensionless zero-frequency intrinsic second hyperpolarizability γ_{int}=γ/4E_{10}^{-5}m^{-2}(e\hbar)^{4} was optimized for a single electron in a 1D well by adjusting the sha…
Maximizing the hyperpolarizability poorly determines the potential
T. J. Atherton, J. Lesnefsky, G. A. Wiggers +1
We have optimized the zero frequency first hyperpolarizability βof a one-dimensional piecewise linear potential well containing a single electron by adjusting the shape of that pot…