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Scale-Invariant Models of Gravity and Particle Physics and their Cosmological Implications

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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

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

High-temperature ultrafast polariton parametric amplification in semiconductor microcavities

Benoît Marie Joseph Deveaud, Stefan Kundermann, Cristiano Ciuti, Michele Saba

Cavity polaritons, the elementary optical excitations of semiconductor microcavities, may be understood as a superposition of excitons and cavity photons(1). Owing to their composite nature, these bosonic particles have a distinct optical response, at the ...

2001

Localizing gravity on a string-like defect in six dimensions

A study was carried out to determine what happens with gravity around a 3-brane of a specific structure in 6D spacetime with a negative cosmological constant. It was shown that there is a normalizible graviton zero mode attached to the stringlike defect, a ...

2000

Anomaly cancellation in K3 orientifolds

Claudio Scrucca

We study in detail the pattern of anomaly cancellation in D = 6 Type IIB Z(N) orientifolds, occurring through a generalized Green-Schwarz mechanism involving several RR antisymmetric tensors and scalars fields. The starting point is a direct string theory ...

2000

On some new warped brane world solutions in higher dimensions

We present new solutions of higher dimensional Einstein's equations with a cosmological constant that localize gravity on branes which are transverse to Ricci-flat manifolds or to homogeneous spaces with topologically non-trivial solutions of gauge field e ...

2000

A scale-dependent dynamic model for large-eddy simulation: application to a neutral atmospheric boundary layer

Fernando Porté Agel, Marc Parlange, Charles Vivant Ignacio Meneveau

A scale-dependent dynamic subgrid-scale model for large-eddy simulation of turbulent flows is proposed. Unlike the traditional dynamic model, it does not rely on the assumption that the model coefficient is scale invariant. The model is based on a second t ...

2000

The fate of the radion in models with metastable graviton

Riccardo Rattazzi

We clarify some general issues in models where gravity is localized at intermediate distances. We introduce the radion mode, which is usually neglected, and we point out that its role in the model is crucial. We show that the brane bending effects discusse ...

2000

Gauge freedom for gravitational wave problems in tensor-scalar theories of gravity

Yves Wiaux

A specific choice of gauge is shown to imply a decoupling between the tensor and scalar components of gravitational radiation in the context of Brans–Dicke-type theories of gravitation. The comparison of the predictions of these theories with those of gene ...

1999

Quantum gravity and extra dimensions at high-energy colliders

Riccardo Rattazzi

Recently it has been pointed out that the characteristic quantum-gravity scale could be as low as the weak scale in theories with gravity propagating in higher dimensions. The observed smallness of Newton's constant is a consequence of the large compactifi ...

1999