MG11 
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Abstract

Big-Rip, Sudden Future and other exotic singularities in the universe.

Current observational data and the particle-physics-motivated cosmological models (superstring, M-theory) allow more exotic types of singularities in the universe than just a Big-Bang and Big-Crunch. One of them is admitted due to a superfast acceleration of the universe (a Big-Rip), another is possible due to unconstraining the evolution of the energy density and pressure (a Sudden Future, a Finite Density) and other appear under some different conditions (type III, type IV). I will discuss the nature of these singularities and present the links between their emergence and observations. I will also study the behaviour of both point particles and strings at these singularities and formulate some new energy conditions which could help to classify those singularities.

IPhantom dark energy and its cosmological consequences.

I will discuss phantom ($p<-\varrho$) dark energy which is an observational option for the current acceleration of the universe. Phantom forces the universe to expand even faster then the cosmological constant and brings it to the final disruption of the whole matter in a large size and density state - a Big-Rip. I will review possible classical and quantum cosmologies with phantom dark energy and relate them to superstring and M-theory cosmologies (scale factor and phantom dualities). Besides, I will also discuss other more exotic scenarios of the future evolution of the universe.