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55 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…
Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations
G. Fritz Benedict, Barbara E. McArthur, Michael W. Feast +6
(abridged) We present new absolute trigonometric parallaxes and relative proper motions for nine Galactic Cepheid variable stars: l Car, zeta Gem, beta Dor, W Sgr, X Sgr, Y Sgr, FF…
Gravitational waves generated by second order effects during inflation
Bob Osano, Cyril Pitrou, Peter Dunsby +2
The generation of gravitational waves during inflation due to the non-linear coupling of scalar and tensor modes is discussed. Two methods describing gravitational wave perturbatio…
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…
On the nature of the cool component of MWC 560
M. Gromadzki, J. Mikolajewska, P. A. Whitelock +1
MWC 560 (V694 Mon) is one of the most enigmatic symbiotic system with a very active accretion-powered hot component. Such activity can be supported only by a luminous asymptotic gi…