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29 papers · 1 filter
The mildly nonlinear imprint of structure on the CMB: the couplings are lensing and aberration
Tim Gebbie
The exact 1+3 covariant multipole hierarchy for the CMB brightness contains kinematic couplings between the shear, acceleration and vorticity of the observers and the temperature m…
Partially locally rotationally symmetric perfect fluid cosmologies
Nazeem Mustapha, George F R Ellis, Henk van Elst +1
We show that there are no new consistent cosmological perfect fluid solutions when in an open neighbourhood of an event the fluid kinematical variables and the electric…
A Solution to the Graceful Exit Problem in Pre-Big Bang Cosmology
G. F. R. Ellis, D. C. Roberts, D. Solomons +1
We examine the string cosmology equations with a dilaton potential in the context of the Pre-Big Bang Scenario with the desired scale factor duality, and give a generic algorithm f…
Fermion stars as gravitational lenses
Neven Bilic, Hrvoje Nikolic, Raoul D. Viollier
We study in detail gravitational lensing caused by a supermassive fermion star and compare it with lensing by a black hole of the same mass. It is argued that lensing effects, bein…
Dust Enshrouded AGB Variables in the LMC
Patricia Whitelock, Michael Feast
The luminosities and periods of obscured AGB stars in the LMC are discussed using a combination of ISO and ground-based infrared photometry. The bolometric luminosities of these st…
Can Mira Variables Tell us the Chemical Abundances in Stellar Systems?
Michael Feast, Patricia Whitelock
A period-metallicity relation for oxygen-rich Miras derived from globular clusters is applied to similar variables in the galactic Bulge. The metallicity distribution in the Bulge…