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SUMMARY:Quasi-isotropic cycles and bounces in a Mixmaster cosmology - Chan
 drima Ganguly (University of Cambridge)
DTSTART:20191122T130000Z
DTEND:20191122T140000Z
UID:TALK129895@talks.cam.ac.uk
CONTACT:Nathan Johnson-McDaniel
DESCRIPTION:Bouncing cosmologies have been studied as alternatives to infl
 ation. They face an isotropy problem as the anisotropies increase in the c
 ontracting phase. In this work\, we study isotropy in the most general ani
 sotropic\, spatially homogeneous cosmology - called the Bianchi IX univers
 e. We show that a quadratic equation of state which acts like a super-stif
 f fluid reminiscent of Ekpyrosis at high energies is able to produce a bou
 nce in this universe. We also introduce a novel isotropisation mechanism u
 sing a negative anisotropic pressures that looks like shear viscosity and 
 show that it isotropises the Bianchi IX cosmology and also mitigates the c
 haotic Mixmaster behaviour that these models are known for.
LOCATION:Pavilion B Potter Room (B1.19)
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