Could the universe have an exotic topology?

Measuring the topology of the universe.

Observations of microwave background fluctuations can yield information not only about the geometry of the universe but potentially about the topology of the universe. If the universe is negatively curved, then the characteristic scale for the topology of the universe is the curvature radius. Thus, if we are seeing the effects of the geometry of the universe, we can hope to soon see signatures ...

Exploring the Global Topology of the Universe

Since this area is still little known, in this talk I will present a summary of work done by myself and a few collaborators at IFT/UNESP in S~ao Paulo. The sections that follow list a number of published papers, which are representative of the e ect of nontrivial cosmic topology on the topics: section II, formal theoretical works; III, the quasar redshift controversy; IV, tting models to data; ...

The Shape and Topology of the Universe

What is the shape of the Universe? Is it curved or flat, finite or infinite ? Is space “wrapped around” to create ghost images of faraway cosmic sources? We review how tessellations allow to build multiply-connected 3D Riemannian spaces useful for cosmology. We discuss more particularly the proposal of a finite, positively curved, dodecahedral space for explaining some puzzling features of the ...

Could Morality Have

Could the South Have Won the War?

Although the Confederate surrenders in April 1865 marked the end of major hostilities of the American Civil War, disputes of interpretation continue to characterise the study of the conduct and outcomes of the War. Whilst this may be simply a feature of all historiography, the extent of these interpretive disputes may well be a direct consequence of the nature of the primary sources that have s...