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Frame (in)equivalence in quantum field theory and cosmology

Publications associées (71)

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A tractable approximation of chance constrained stochastic MPC based on affine disturbance feedback

Colin Neil Jones

This paper deals with model predictive control of uncertain linear discrete-time systems with polytopic constraints on the input and chance constraints on the states. When having polytopic constraints and bounded disturbances, the robust problem with an op ...

IEEE2008

Non-Pauli-Fierz Massive Gravitons

Michele Redi

We study general Lorentz invariant theories of massive gravitons. We show that, contrary to the standard lore, there exist consistent theories where the graviton mass term violates Pauli-Fierz structure. For theories where the graviton is a resonance, this ...

2008

Causality, analyticity and an IR obstruction to UV completion

Riccardo Rattazzi, Arthur Adams

We argue that certain apparently consistent low-energy erective field theories described by local, Lorentz-invariant Lagrangians, secretly exhibit macroscopic non-locality and cannot be embedded in any UV theory whose S-matrix satisfies canonical analytici ...

2006

Theory of trapped polaritons in patterned microcavities

Vincenzo Savona, Davide Sarchi, Pierre Lugan

We consider the system of a quantum well embedded in a planar semiconductor microcavity with a shallow circular mesa patterned on top of the cavity spacer. For this system we develop the linear coupling theory of polaritons. We then compute polariton eigen ...

V C H PUBLISHERS, SUITE 909, 220 E 23RD ST, NEW YORK, NY 10010 USA2006

On the decoupling of heavy modes in Kaluza-Klein theories

In this paper we examine the 4-dimensional effective theory for the light Kaluza-Klein (KK) modes. Our main interest is in the interaction terms. We point out that the contribution of the heavy KK modes is generally needed in order to reproduce the correct ...

2006

Gravitational quantum corrections in warped supersymmetric brane worlds

Riccardo Rattazzi, Claudio Scrucca

We study gravitational quantum corrections in supersymmetric theories with warped extra dimensions. We develop for this a superfield formalism for linearized gauged supergravity. We show that the 1-loop effective Kahler potential is a simple functional of ...

2005

Running and matching from 5 to 4 dimensions

Riccardo Rattazzi, Roberto Contino

We study 5-dimensional grand-unified theories in an orbifold geometry by the method of effective field theory: we match the low and high energy theories by integrating out at 1-loop the massive Kaluza-Klein states. In the supersymmetric case the radius dep ...

2002

Graviton loops and brane observables

Riccardo Rattazzi, Roberto Contino

We discuss how to consistently perform effective Lagrangian computations in quantum gravity with branes in compact extra dimensions. A reparametrization invariant and infrared finite result is obtained in a non trivial way. It is crucial to properly accoun ...

2001

Nonlocal symmetry breaking in Kaluza-Klein theories

Claudio Scrucca

Scherk-Schwarz gauge symmetry breaking of a D-dimensional field theory model compactified on a circle is analyzed. It is explicitly shown that forbidden couplings in the,unbroken theory appear in the one-loop effective action only in a nonlocal way, implyi ...

2001

Quantum-Well Excitons In Semiconductor Microcavities - Unified Treatment Of Weak And Strong-Coupling Regimes

Vincenzo Savona, Paolo Schwendimann

The system of one or several quantum wells embedded in a planar semiconductor Fabry-Perot microcavity with distributed Bragg reflectors is studied in the framework of both a semiclassical and a full quantum theory. The results obtained with the two treatme ...

1995