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- South African Radio Astronomy ObservatoryZA50 papers
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45 papers · 1 filter
The evolution of tensor perturbations in scalar-tensor theories of gravity
Sante Carloni, Peter K. S. Dunsby
The evolution equations for tensor perturbations in a generic scalar tensor theory of gravity are presented. Exact solution are given for a specific class of theories and Friedmann…
HST and Optical Observations of Three Pulsating Accreting White Dwarfs in Cataclysmic Variables
Paula Szkody, Anjum Mukadam, Boris T. Gaensicke +8
Ultraviolet observations using the Solar Blind Channel on the Hubble Space Telescope provide light curves and low resolution spectra of three pulsating white dwarfs in the cataclys…
The cosmological gravitational wave background from primordial density perturbations
Kishore N. Ananda, Chris Clarkson, David Wands
We discuss the gravitational wave background generated by primordial density perturbations evolving during the radiation era. At second-order in a perturbative expansion, density f…
A dynamical system approach to higher order gravity
Sante Carloni, Peter K. S. Dunsby
The dynamical system approach has recently acquired great importance in the investigation on higher order theories of gravity. In this talk I review the main results and I give bri…
Gauge invariant perturbations of Scalar-Tensor Cosmologies: The vacuum case
Sante Carloni, Peter K. S. Dunsby, Claudio Rubano
The covariant gauge invariant perturbation theory of scalar cosmological perturbations is developed for a general Scalar-Tensor Friedmann-Lemaitre-Robertson-Walker cosmology in a v…
Group classification of the Sachs equations for a radiating axisymmetric, non-rotating, vacuum space-time
Nail H. Ibragimov, Ewald J. H. Wessels, George F. R. Ellis
We carry out a Lie group analysis of the Sachs equations for a time-dependent axisymmetric non-rotating space-time in which the Ricci tensor vanishes. These equations, which are th…