The w < -1 side of Dark Energy - Univers Invisible

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Can we live with a ghost?• Classically: Hamiltonian not bounded. Possibility <strong>of</strong>exchanging energy between positive and negative energysectors.Vikman ‘05No pathology until linear theory remainsvalid.• Quantum mechanically: Vacuum is unstable. Decay rate isinfinite in any Lorentz invariant theory.Cline, Jeon, Moore ‘03GWe take a conservative approach: forbid ghosts (negative kinetic energy).Can we get w Q< – 1 with positive kinetic energy?
Beyond a canonical fieldK-essence:Let us expand around:Convenient parametrization:etc,…Action for perturbations. Making explicit the background dependence:
Page 1 and 2: The w < -1 side of Dark EnergyFilip
Page 3 and 4: Is there a life below -1?• Energy
Page 5: Phantom from canonical field?Can we
Page 9 and 10: Quintessential plane(1+w Q) Ω Qc S
Page 11 and 12: w < -1 and gradient instabilitiesWi
Page 13 and 14: Gradient instability:2!Stability an
Page 15 and 16: Back to the plane with higher deriv
Page 17 and 18: For example...No other energycompon
Page 19: Conclusions• General framework to
Page 22 and 23: Scaling in EFTArkani-Hamed et al
Page 24 and 25: The action for perturbations... int
Page 26 and 27: Stability analysisCreminelli, Luty,
Page 28 and 29: The phantom divide- What happens to

The w < -1 side of Dark Energy - Univers Invisible

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