by Richard E. | May 12, 2020 | Early universe dynamics and observables
Cosmological parameter estimations can require many thousands of time-consuming evaluations of the likelihood function. We show that computed likelihoods can be used to train an emulator that accurately predicts likelihoods for later points in the MCMC analyses and...
by Richard E. | Apr 9, 2020 | Dark matter and dark energy, Multiverse cosmology
The density of empty space is not exactly zero, but is roughly 10-123 in “natural” units. One possible explanation is that there is a “landscape” of 10500 or more possible vacua and, if the heights of the vacua are uniformly distributed, a vast...
by Richard E. | Nov 1, 2018 | Technical Notes
PyUltraLight is a Python-based code designed for the study of non-relativistic ultralight dark matter dynamics in a static spacetime background. The code uses pseudo-spectral methods to compute the evolution of a complex scalar field governed by the...
by Richard E. | Dec 15, 2017 | Early universe dynamics and observables
We survey the full inflationary dynamics of a general quartic polynomial potential. There are several distinct inflationary scenarios but the models cannot completely fill the “parameter space” of spectral variables, making it possible for future...
by Richard E. | Oct 21, 2014 | Writing and Videos
Richard’s TEDx talk from the Auckland Aotea Centre, 2014 on dark matter and Christmas trees…
