16 papers · 1 filter
Damping rates in the MSSM and electroweak baryogenesis
Per Elmfors, Kari Enqvist, Antonio Riotto +1
We present an analysis of the thermalization rate of Higgsinos and winos based on the imaginary part of the two-point Green function in the {\it unbroken} phase of the MSSM. We use…
Strongly first order electroweak phase transition induced by primordial hypermagnetic fields
Per Elmfors, Kari Enqvist, Kimmo Kainulainen
We consider the effect of the presence of a hypermagnetic field at the electroweak phase transition. Screening of the Z-component inside a bubble of the broken phase delays the pha…
Stability of large scale chromomagnetic fields in the early universe
Per Elmfors, David Persson
It is well known that Yang-Mills theory in vacuum has a perturbative instability to spontaneously form a large scale magnetic field (the Savvidy mechanism) and that a constant fiel…
Anomalies at high temperature
Per Elmfors
The anomaly equation can be derived from the ultraviolet properties of quantum field theory and should, therefore, not depend on infrared properties, such as the presence of a ther…
Thermally induced photon splitting
Per Elmfors, Bo-Sture Skagerstam
We calculate thermal corrections to the non-linear QED effective action for low-energy photon interactions in a background electromagnetic field. The high-temperature expansion sho…
Neutrinos with Magnetic Moment: Depolarization Rate in Plasma
Per Elmfors, Kari Enqvist, Georg Raffelt +1
Neutrinos with a magnetic moment change their helicity when interacting with an electromagnetic field. Various aspects of this effect have been described as spin precession, sp…