2 papers
astro-ph.CO2019
Dark matter with excitable levels
Andrew J. Wren
This paper explores the possibility that dark matter particles are objects with a set of excitable levels, as for a string or drum. A change in excitation is associated with the ab…
gr-qc2017
Gravitational waves in a flat radiation-matter universe including anisotropic stress
Andrew J. Wren, Jorge L. Fuentes, Karim A. Malik
We present novel analytical solutions for linear-order gravitational waves or tensor perturbations in a flat Friedmann-Robertson-Walker universe containing two perfect fluids, radi…