Speaker
            Dr
    Malcolm Fairbairn
        
    Description
We show how the propagation of TeV photons differs in Universes with different 
expansion histories.  We discuss whether it is possible to identify different cosmologies 
based on their opacity, discuss uncertainties associated with the observed star 
formation rates and show how constraints from this method adds to existing data.
            Author
        
            
                
                        Dr
                    
                
                    Malcolm Fairbairn