Dressing up dark energy with no matter, is it the emperor's new clothes ?

por Troels Haugboelle (University of Aarhus, Dinamarca)

lunes 20 oct. 2008 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

The possibility that we live in a special place in the universe, close to the center of a large void, is an appealing alternative to the prevailing interpretation of the acceleration of the universe in terms of a Lambda-CDM model with a dominant dark energy component. I will introduce models with a large void embedded in a flat Einstein de Sitter space-time, and confront them with a plethora of observations, from Type Ia Supernovae to Cosmic Microwave Background, Baryon Acoustic Oscillations data, and kinetic Sunyaev-Zeldovich observations. I will show that void models successfully can explain the observational data, albeit with some strain, and comment on new observations, that may hint the existence of large scales flows in the universe, that could belinked to inhomogeneities on large scales.