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School of Physics and Astronomy

Cosmological dynamics for scalar fields with kinetic corrections

19 February 2014

Time: 4:30am
Venue: Maths 103

The London Relativity and Cosmology Seminar
Nicola Tamanini (UCL)

In this talk the background dynamical evolution of a universe filled with perfect fluid matter and a cosmological scalar field will be analyzed using dynamical system techniques. First the phenomenology of a canonical scalar field with exponential potential will be briefly revised. Then square and square root kinetic corrections to the scalar field canonical Lagrangian will be considered and the resulting dynamics at cosmological distances will be studied. These noncanonical cosmological models imply new interesting phenomenology including early time matter dominated solutions, cosmological scaling solutions and late time phantom dominated solutions with dynamical crossing of the phantom barrier. Stability and viability issues for these scalar fields will also be presented and discussed. The talk will be based on the results of arXiv:1401.6339.