Colliding Bubble Worlds
نویسنده
چکیده
We consider a cosmological model in which our Universe is a spherically symmetric bubble wall in 5-dimensional anti-de Sitter spacetime. We argue that the bubble on which we live will undergo collisions with other similar bubbles and estimate the spectrum of such collisions. The collision rate is found to be independent of the age of our Universe. Collisions with small bubbles provide an experimental signature of this scenario, while collisions with larger bubbles would be catastrophic.
منابع مشابه
Separation Distribution of Vacuum Bubbles in de Sitter Space
We compute the probability distribution of the invariant separation between nucleation centers of colliding true vacuum bubbles arising from the decay of a false de Sitter space vacuum. We find that even in the limit of a very small nucleation rate (ΓH−5 ≪ 1) the production of widely separated bubble pairs is suppressed. This distribution is of particular relevance for the recently proposed “co...
متن کاملExactly Scale-Invariant Cosmological Perturbations From a Colliding Bubble Braneworld Universe
One of the aims of braneworld cosmology is to identify a ‘smoking gun’ for the existence of large extra dimensions by means of observations of the early universe. Braneworld cosmology has succeeded in reproducing the conventional cosmology at late times in a higher-dimensional context, but finding a unique observational signature has proved elusive. Here we demonstrate that the recently propose...
متن کاملGravitational radiation from colliding vacuum bubbles: Envelope approximation to many-bubble collisions.
We introduce an approximation to calculate the gravitational radiation produced by the collision of true-vacuum bubbles that is simple enough to allow the simulation of a phase transition by the collision of hundreds of bubbles. This “envelope approximation” neglects the complicated “overlap” regions of colliding bubbles and follows only the evolution of the bubble walls. The approximation accu...
متن کاملVacuum Energy, Cosmological Supersymmetry Breaking and Inflation from Colliding Brane
In the context of colliding brane worlds I discuss a toy cosmological model, developed in collaboration with E. Gravanis, which arguably produces inflation and a relaxing to zero cosmological “constant” hierarchically small as compared to the supersymmetry breaking (TeV) scale. Supersymmetry breaking is induced by compactification of the brane worlds on magnetized tori. The crucial ingredient i...
متن کاملCosmological Perturbations Generated in the Colliding Bubble Braneworld Universe
We compute the cosmological perturbations generated in the colliding bubble braneworld universe in which bubbles filled with five-dimensional antide Sitter space (AdS5) expanding within a five dimensional de Sitter space (dS5) or Minkowski space (M5) collide to form a (3+1) dimensional local brane on which the cosmology is virtually identical to that of the RandallSundrum model. The perturbatio...
متن کامل