Cosmological Perturbations at Second Order and Recombination Perturbed (2008)
Senatore, Leonardo, Tassev, Svetlin, Zaldarriaga, Matias
We derive the full set of second-order equations governing the evolution of cosmological perturbations, including the effects of the first-order electron number density perturbations, \delta_e. We...
Non-Gaussianities from Perturbing Recombination (2008)
Senatore, Leonardo, Tassev, Svetlin, Zaldarriaga, Matias
We approximately compute the bispectrum induced on the CMB by fluctuations in the standard recombination history. Of all the second order sources that can induce non-Gaussianity during recombination,...
Kinematic Density Waves in Accretion Disks (2007)
Tassev, Svetlin, Bertschinger, Edmund
When thin accretion disks around black holes are perturbed, the main restoring force is gravity. If gas pressure, magnetic stresses, and radiation pressure are neglected, the disk remains thin as...