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Supersymmetry-breaking loops from analytic continuation into superspace

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Unificaxion

Riccardo Rattazzi

Dark matter, gauge coupling unification, and the strong CP problem find a common and simple solution (in the absence of naturalness) within axion models. We show that such a solution, even without specifying the details of the model implementation, makes t ...

Elsevier Science Bv2012

Design-dependent gauge factors of highly doped n-type 4H-SiC piezoresistors

Nico de Rooij, Danick Briand, Terunobu Akiyama

This paper presents the experimentally obtained gauge factor (GF) of 4H-SiC piezoresistors, fabricated out of the n-type epitaxial layer and characterized on millimeter-size SiC cantilever beams at room temperature. It was found that the GF is dependent on ...

2012

Antiferromagnetic Spin-S Chains with Exactly Dimerized Ground States

Frédéric Mila, Salvatore Manmana, Frédéric Alexis Michaud, François Vernay

We show that spin S Heisenberg spin chains with an additional three-body interaction of the form (Si-1 center dot S-i)(S-i center dot S-i (+) (1)) + H.c. possess fully dimerized ground states if the ratio of the three-body interaction to the bilinear one i ...

2012

The lightest scalar in theories with broken supersymmetry

Claudio Scrucca, Leonardo Brizi

We study the scalar mass matrix of general supersymmetric theories with local gauge symmetries, and derive an absolute upper bound on the lightest scalar mass. This bound can be saturated by suitably tuning the superpotential, and its positivity therefore ...

2011

Vacuum Stability in Supersymmetric Effective Theories

Leonardo Brizi

The main topics discussed in this thesis are supersymmetric low-energy effective theories and metastability conditions in generic non-renormalizable models with global and local supersymmetry. In the first part we discuss the conditions under which the low ...

EPFL2011

Lopsided gauge mediation

Riccardo Rattazzi, Duccio Pappadopulo, Roberto Franceschini, Andrea De Simone

It has been recently pointed out that the unavoidable tuning among supersymmetric parameters required to raise the Higgs boson mass beyond its experimental limit opens up new avenues for dealing with the so called mu-B-mu problem of gauge mediation. In fac ...

2011

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

Daniel Zenhäusern

Currently, the best theoretical description of fundamental matter and its gravitational interaction is given by the Standard Model (SM) of particle physics and Einstein's theory of General Relativity (GR). These theories contain a number of seemingly unrel ...

EPFL2011

Solving the mu problem with a heavy Higgs boson

Roberto Franceschini

We discuss the generation of the mu-term in a class of supersymmetric models characterized by a low energy effective superpotential containing a term lambda SH1H2 with a large coupling lambda similar to 2. These models generically predict a lightest Higgs ...

2011

Effects of heavy modes on vacuum stability in supersymmetric theories

Claudio Scrucca, Leonardo Brizi

We study the effects induced by heavy fields on the masses of light fields in supersymmetric theories, under the assumption that the heavy mass scale is much higher than the supersymmetry breaking scale. We show that the square-masses of light scalar field ...

2010

Metastable supersymmetry breaking in N=2 non-linear sigma-models

Claudio Scrucca, Jean-Claude Jacot

We perform a general study of the issue of metastability for supersymmetry-breaking vacua in theories with N=1 and N=2 global supersymmetry. This problem turns out to capture all the important qualitative features of the corresponding question in theories ...

Elsevier2010