Imperfect Dark Energy of Kinetic Gravity Braiding

by Alexander Vikman

Friday 5 Nov 2010, 11:30 → 12:30 Europe/Zurich

Auditoire 234 (Geneva university)

This will be the talk about new class of scalar-tensor theories which exhibit Kinetic Gravity Braiding - essential kinetic mixing of the metric with the scalar filed. In particular I will discuss an equivalent formulation of these theories as hydrodynamics of imperfect fluids. Then I will consider cosmological dynamics in this systems and show that it allows for various interesting peculiar phenomena: stable violation of the Null Energy Condition, de Sitter solution with non-vanishing sound speed etc.