37 citations · 151 across the 20 of their papers we have counts for
20 papers
A non-trivial PT-symmetric continuum Hamiltonian and its Eigenstates and Eigenvalues
Lawrence Mead, David Garfinkle, Sungwook Lee
In this paper, a non-trivial system governed by a continuum PT-symmetric Hamiltonian is discussed. We show that this Hamiltonian is iso-spectral to the simple harmonic oscillator.…
Cosmological initial data for numerical relativity
David Garfinkle, Lawrence Mead
We find initial data for numerical relativity simulations of inhomogeneous cosmologies. This involves treating an exceptional case of the general relativity constraint equations. W…
Reaffirmation of Cosmological Oscillations in the Scale Factor from the Pantheon Compilation of 1048 Type Ia Supernovae
Harry I. Ringermacher, Lawrence R. Mead
We observe damped temporal oscillations in the scale factor at a dominant frequency of ~ 7 cycles/Hubble-time in the Pantheon Compilation of 1048 type Ia supernovae (SNe). The resi…
The shape of the orbit in FLRW spacetimes
David Garfinkle, Lawrence R. Mead, H. I. Ringermacher
The shape of the orbit of a free particle is examined in FLRW cosmologies. The spatial projection of the orbit is time-independent and has a simple geometric description. We relate…
Evidence for Scale Factor Oscillations Observed in the Large Scale Structure of the Universe
H. I. Ringermacher, L. R. Mead
We present two independent analyses as further evidence that galaxy clustering at scales of 500 Mpc and greater has a periodic time component induced by oscillations in the scale f…
In Defense of an Accelerating Universe: Model Insensitivity of the Hubble Diagram
H. I. Ringermacher, L. R. Mead
A recently published paper by Nielsen, Guffanti and Sarkar argues that the evidence for cosmic acceleration is marginal and that a coasting universe - the Milne Universe - fits the…