Physics

The central drive of the analytic S-matrix program is to determine scattering amplitudes in any given theory from symmetries and analytic properties. This program led for instance to the birth of string theory with Veneziano's amplitude. Many recent...

Events with missing energies provide important channels for new physics searches at colliders. They appear in many new physics models with a dark matter candidate. I will give a more systematic discussion of the kinematic variables which are...

The loop approach to quantum gravity has developed considerably during the last few years, especially in its covariant ('spinfoam') version. I present the current definition of the theory and the results that have been proven. I discuss what I...

We present an alternative approach to low-energy supersymmetry. Instead of imposing R-parity we apply the minimal flavor violation (MFV) hypothesis to the R-parity violating MSSM. In this framework, squarks can be light and the proton long lived...