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4 papers
Living with ghosts in Lorentz invariant theories
Jaume Garriga, Alexander Vilenkin
We argue that theories with ghosts may have a long lived vacuum state even if all interactions are Lorentz preserving. In space-time dimension D = 2, we consider the tree level dec…
Perturbations in k-inflation
Jaume Garriga, V. F. Mukhanov
We extend the theory of cosmological perturbations to the case when the ``matter'' Lagrangian is an arbitrary function of the scalar field and its first derivatives. In particular,…
Canonical Quantization of Cosmological Perturbations in the One Bubble Open Universe
Jaume Garriga, Xavier Montes, Misao Sasaki +1
Faddeev and Jackiw's method for constrained systems is used to derive a gauge invariant formulation of cosmological perturbations in the one bubble inflationary universe. For scala…
Bubble fluctuations in inflation
Jaume Garriga
In the context of the open inflationary universe, we calculate the amplitude of quantum fluctuations which deform the bubble shape. These give rise to scalar field fluctuations in…