<p>Inhomogeneous Cosmologies III<p>

Session

Wednesday Session 2

19 Sept 2018, 11:00

Conveners

Wednesday Session 2

• Hayley Macpherson (Monash University)

18. Strict solutions in the linear theory of cosmological perturbations up to second order

Krzysztof Głód (Astronomical Observatory of the Jagiellonian University)

19/09/2018, 11:00

We consider scalar perturbations of the spatially flat Friedmann--Lemaitre cosmological model. We formulate conditions for the metric functions under which basic gauge-invariant kinematic and dynamic fields of the perturbed model vanish at the first order of the linear perturbation theory. Then we combine these conditions to construct especially interesting perturbed models with specific...

28. The special case of the Stephani solution for the Universe with accelerated expansion

Iryna Bormotova (Silesian University in Opava, Czech Republic) , Mariia Churilova (Dnipropetrovsk National University)

19/09/2018, 11:30

We present the particular case of the Stephani solution for shear-free perfect fluid with uniform energy density and non-uniform pressure. Such models appeared last time as possible alternative to the consideration of the exotic forms of matter like dark energy that would cause the acceleration of the Universe expansion. These models are characterised by the spatial curvature depending on...