143 citations · 271 across the 15 of their papers we have counts for
15 papers
One Loop Vaccum Polarization in a Locally de Sitter Background
T. Prokopec, O. Tornkvist, R. P. Woodard
We compute the one loop vacuum polarization from massless, minimally coupled scalar QED in a locally de Sitter background. Gauge invariance is maintained through the use of dimensi…
Large-Scale Primordial Magnetic Fields from Inflation and Preheating
Ola Tornkvist, Anne-Christine Davis, Konstantinos Dimopoulos +1
We consider models in which the (transverse) photon mass is non-zero during inflation and drops to zero non-adiabatically at the end of inflation. Through this process, vacuum fluc…
The Origin of Cosmic Magnetic Fields
Ola Tornkvist
In this talk, I review a number of particle-physics models that lead to the creation of magnetic fields in the early universe and address the complex problem of evolving such primo…
Phase Equilibration and Magnetic Field Generation in U(1) Bubble Collisions
E. J. Copeland, P. M. Saffin, O. Tornkvist
We present the results of lattice computations of collisions of two expanding bubbles of true vacuum in the Abelian Higgs model with a first-order phase transition. New time-depend…
Magnetic Fields from Bubble Collisions - A Progress Report
Ola Tornkvist
Primordial magnetic fields may be created in collisions of expanding bubbles in a first-order cosmological phase transition and later serve as seed fields for galactic magnetic fie…
Definition of the Electromagnetic Field in the Broken-Symmetry Phase of the Electroweak Theory
Ola Tornkvist
In the broken-symmetry phase of the electroweak theory there is no unique definition of the electromagnetic field tensor in cases where the magnitude of the Higgs field differs fro…