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Beyond Einstein gravity
Pauli-Fierz Gravitons on Friedmann-Robertson-Walker Background
Abstract We derive the Hamiltonian describing Pauli–Fierz massive gravitons on a flat Friedmann–Robertson–Walker (FRW) cosmology in a particular, non-generic effective field theory. The cosmological
Lorentz-violating massive gauge and gravitational fields
Abstract We study nonlinear dynamics in models of Lorentz-violating massive gravity. The Boulware–Deser instability restricts severely the class of acceptable theories. We identify a model that is
Dynamical four-form fields
We present an example of a gauge-invariant Lagrangian that contains four derivatives and describes one massive, non-ghostlike, degree of freedom.
Tachyonic Quintessence and a Preferred Direction in the Sky
We show that quintessence, when it is described by a tachyonic field, can amplify a tiny primordial gradient generating a preferred direction in the sky. In its simplest realization, this mechanism
Dressed Domain Walls and holography
The cutoff version of the AdS/CFT correspondence states that the Randall Sundrum scenario is dual to a Conformal Field Theory (CFT) coupled to gravity in four dimensions. The gravitational field
Delocalization from anomaly inflow and intersecting brane dynamics
We study intersecting D-brane models, that describe at low energies a two dimensional chiral fermion theory localized at the intersection. The fermions are coupled to gauge fields in the bulk. The
Dynamical four-form fields
We present an example of a gauge-invariant Lagrangian that contains four derivatives and describes one massive, nonghostlike, degree of freedom.
Lorentz-violating massive gravity in curved space
In models of modified gravity, extra degrees of freedom usually appear. They must be removed from the spectrum because they may indicate the presence of instabilities and because otherwise the model
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