Bonn 2010 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 11: Kosmologie 2
GR 11.3: Talk
Wednesday, March 17, 2010, 14:40–15:00, JUR K
Propagation of vacuum bubbles on dynamical backgrounds — •Dennis Simon1, Julian Adamek1, Aleksandar Rakic1, and Jens Niemeyer1,2 — 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Institut für Astrophysik, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
In the context of nucleation of vacuum bubbles by Coleman-De Luccia tunneling we focus on the propagation of such bubbles in matter dominated FLRW and LT backgrounds. Using a thin wall approximation and the Israel junction method we solve the equations of motion and show that, in contrast to the standard de Sitter scenario, bubbles in dust dominated backgrounds can not expand. Furthermore the presence of dust and curvature inhomogeneities hardly affects the trajectory of the domain wall and therefore has no influence on the cosmology inside the bubble. However, a sudden phase transition in the matter background changes the motion of the bubble and raises the question whether this leads to potentially observable effects, e.g. in the CMB.