3 papers
gr-qc2020
Viable Gauge Choices in Cosmologies with Non-Linear Structures
Timothy Clifton, Christopher S. Gallagher, Sophia Goldberg +1
A variety of gauges are used in cosmological perturbation theory. These are often chosen in order to attribute physical properties to a particular choice of coordinates, or otherwi…
gr-qc2019
Multi-Scale Perturbation Theory I: Methodology and Leading-Order Bispectrum Corrections in the Matter-Dominated Era
Christopher Gallagher, Timothy Clifton, Chris Clarkson
Two-parameter perturbation theory is a scheme tailor-made to consistently include nonlinear density contrasts on small scales (), whilst retaining a traditiona…
gr-qc2018
Relativistic Euler Equations in cosmologies with non-linear structures
Christopher S. Gallagher, Timothy Clifton
We consider a new variant of cosmological perturbation theory that has been designed specifically to include non-linear density contrasts on scales 100 Mpc, while still allowing fo…