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SUMMARY:Isotropising anisotropic cyclic cosmologies - Chandrima Ganguly
DTSTART:20170512T120000Z
DTEND:20170512T130000Z
UID:TALK72664@talks.cam.ac.uk
CONTACT:Christopher Moore
DESCRIPTION:Standard models of cosmology use inflation as a mechanism to r
 esolve the isotropy and homogeneity problem of the universe as well as th
 e flatness problem. However\, due to various well known problems with the 
 inflationary paradigm\, there has been an ongoing search for alternatives.
  Perhaps the most famous among these is the cyclic universe scenario or sc
 enarios which incorporate bounces. As these scenarios have a contracting p
 hase in the evolution of the universe\, it is reasonable to ask whether th
 e problems of homogeneity and isotropy can still be resolved in these scen
 arios. In my talk\, I will focus on the problem of the resolution of isotr
 opy. In the contracting phase of the evolution\, the mechanism of ekpyrosi
 s is used in most cosmological scenarios which incorporate a contracting p
 hase to mitigate the problem of anisotropies blowing up on approaching the
  bounce. I will start by studying anisotropic universes and I shall examin
 e the effect of the addition of anisotropic pressures on the ekpyrotic pha
 se. I will then consider evolving such anisotropic universes through sever
 al cycles with increasing expansion maxima at each successive bounce. This
  is the mechanism suggested to deal with the flatness problem. My aim will
  be to see if the resolution of the flatness problem also leads to a simul
 taneous resolution of the isotropy problem.
LOCATION:Pavilion B Potter Room (B1.19)
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