Leptogenesis from spontaneous symmetry breaking during inflation

Spontaneous Discrete Symmetry Breaking During Inflation and the NMSSM Domain Wall Problem

The Next to Minimal Supersymmetric Standard Model (NMSSM), proposed as a solution of the μ problem of the Minimal Supersymmetric Standard Model, has a discrete Z3 symmetry which is spontaneously broken at the electroweak phase transition, resulting in a cosmological domain wall problem. This domain wall problem cannot be solved by explicit Z3 breaking without introducing supergravity tadpole co...

Leptogenesis from supersymmetry breaking.

We show that soft supersymmetry breaking terms involving the heavy sneutrinos can lead to sneutrino-antisneutrino mixing and to new sources of CP violation, which are present even if a single generation is considered. These terms are naturally present in supersymmetric versions of leptogenesis scenarios, and they induce indirect CP violation in the decays of the heavy sneutrinos, eventually gen...

From Yukawa’s Pion to Spontaneous Symmetry Breaking

What we now call particle physics started first as nuclear physics in the 1930s, and I have once proposed to call Ernest Lawrence and Hideki Yukawa the two founders of particle physics: The first invented the cyclotron, the second ‘‘invented’’ the meson theory, which together opened the door to the exploration of ever higher energy phenomena and to the discovery of particles of ever increasing ...

Nonperturbative Spontaneous Symmetry Breaking

One of the most astonishing results of quantum field theory is spontaneous symmetry breaking. One can say that it is the situation when something arises from the quantization. This means that on the quantum level one has something that was not present on the classical level. Coleman and Weinberg [1] write : “ . . . higher-order effects may qualitatively change the character of a physical theory...

Spontaneous Symmetry Breaking