2 papers
astro-ph2003
The Luminosity Distance in Perturbed FLRW Spacetimes
Ted Pyne, Mark Birkinshaw
We derive an expression for the luminosity distance in FLRW spacetimes affected by scalar perturbations. Our expression is complete to linear order and is expressed entirely in ter…
astro-ph1994
Beyond the Thin Lens Approximation
Ted Pyne, Mark Birkinshaw
We obtain analytic formulae for the null geodesics of Friedmann-Lema\^ıtre-Robertson-Walker spacetimes with scalar perturbations in the longitudinal gauge. We use these to provide…