Concept

Astronomie gravitationnelle

Publications associées (135)

Mediation of supersymmetry breaking in extra dimensions

We review the mechanisms of supersymmetry breaking mediation that occur in sequestered models, where the visible and the hidden sectors are separated by an extra dimension and communicate only via gravitational interactions. By locality, soft breaking term ...

2005

D-type supersymmetry breaking and brane-to-brane gravity mediation

Riccardo Rattazzi, Claudio Scrucca

We revisit the issue of gravitational contributions to soft masses in five-dimensional sequestered models. We point out that, unlike for the case of F-type supersymmetry breaking, for D-type breaking these effects generically give positive soft masses squa ...

2005

Gravitational collapse of colloidal gels

Suliana Manley

We present a unified framework for understanding the compaction of colloidal gels under their own weight. The dynamics of the collapse are determined by the value of the gravitational stress σg, as compared to the yield stress σY of the network. For σg

2005

Cosmic microwave background constraints on the strong equivalence principle

Pierre Vandergheynst, Yves Wiaux

We study the effect of a violation of the strong equivalence principle (SEP) on the cosmic microwave background (CMB). Such a violation would modify the weight of baryons in the primordial gravitational potentials and hence their impact in the establishmen ...

2004

Innovative experimental concepts for optical coherence tomography

Markus Laubscher

Optical Coherence Tomography (OCT) is a recent biomedical imaging technique based on low-coherence interferometry that is capable of acquiring depth-resolved reflectivity maps of scattering tissues with high sensitivity. The conventionally employed imaging ...

EPFL2004

The Auxiliary Variable Trick for deriving Kalman Smoothers

We present a Forward-Backward Kalman smoother derivation that functions for small observation noise. Whilst this smoother can be found by judicious transformation of the standard Forward-Backward equations, we introduce an auxiliary variable trick which gr ...

IDIAP2004

Jones vector imaging by use of digital holography: simulation and experimentation

Christian Depeursinge, Tristan Colomb, Etienne Cuche, Frédéric Montfort, Pierre Marquet

We present a method to image Jones vector by use of digital holography. We demonstrate that with a single hologram acquisition, the method allows to image and to calculate Jones vector and derive the polarization parameters. The principle consists in using ...

2004

Local amplitude and phase retrieval method for digital holography applied to microscopy

Michaël Unser, Christian Depeursinge, Etienne Cuche, Michael Stefan Daniel Liebling, Thierry Blu, Pierre Marquet

We present a numerical two-step reconstruction procedure for digital off-axis Fresnel holograms. First, we retrieve the amplitude and phase of the object wave in the CCD plane. For each point we solve a weighted linear set of equations in the least-squares ...

SPIE2003

Local Amplitude and Phase Retrieval Method for Digital Holography Applied to Microscopy

Michaël Unser, Christian Depeursinge, Etienne Cuche, Thierry Blu, Pierre Marquet

SPIE2003

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

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