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SUMMARY:Chandrima Ganguly (University of Cambridge)
DTSTART:20200503T220000Z
DTEND:20200503T230000Z
DTSTAMP:20260423T021055Z
UID:CosmoConB/8
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CosmoConB/8/
 ">Mixmasters That Bounce</a>\nby Chandrima Ganguly (University of Cambridg
 e) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\nBouncing cos
 mologies have been studied as alternatives to inflation. They face an isot
 ropy problem as the anisotropies increase in the contracting phase. In thi
 s work\, we study isotropy in the most general anisotropic\, spatially hom
 ogeneous cosmology - called the Bianchi IX universe. We show that a quadra
 tic equation of state which acts like a super-stiff fluid reminiscent of E
 kpyrosis at high energies is able to produce a bounce in this universe. We
  also introduce a novel isotropisation mechanism using a negative anisotro
 pic pressures that looks like shear viscosity and show that it isotropises
  the Bianchi IX cosmology and also mitigates the chaotic Mixmaster behavio
 ur that these models are known for.\n\nVideo of Talk: <a href="https://www
 .youtube.com/watch?v=eKXPpyUY_Ok">https://www.youtube.com/watch?v=eKXPpyUY
 _Ok</a>\n\nRelevant Papers:<br> \n<a href="https://arxiv.org/abs/1710.0074
 7">[1710.00747] Evolution of Cyclic Mixmaster Universes with Non-comoving 
 Radiation</a>\, by Chandrima Ganguly\, John D. Barrow<br>\n<a href="https:
 //arxiv.org/abs/1703.05969">[1703.05969] Cyclic Mixmaster Universes</a>\, 
 by John D. Barrow\, Chandrima Ganguly<br>\n
LOCATION:https://researchseminars.org/talk/CosmoConB/8/
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