129 citations · 1k across the 41 of their papers we have counts for
14 papers · 1 filter
Electromagnetism and photons in continuous media
Finn Ravndal
Different theoretical and experimental aspects of electromagnetic phenomena in media is reviewed. The 100 year old Minkowski theory is in agreement with most experiments, but has t…
Electromagnetic energy-momentum tensors in media
Finn Ravndal
It is pointed out that the previous energy-momentum tensors of Minkowski and Abraham for the electromagnetic field in continuous media are based on a covariant formulation which do…
Resolution of an apparent inconsistency in the electromagnetic Casimir effect
H. Alnes, K. Olaussen, F. Ravndal +1
The vacuum expectation value of the electromagnetic energy-momentum tensor between two parallel plates in spacetime dimensions D > 4 is calculated in the axial gauge. While the pre…
Lagrangian formalism of gravity in the Randall-Sundrum model
Petter Callin, Finn Ravndal
We derive the effective Lagrangian of the physical four-dimensional fields in the Randall-Sundrum (RS) model, and use this to calculate the Newtonian gravitational potential betwee…
Higher order corrections to the Newtonian potential in the Randall-Sundrum model
Petter Callin, Finn Ravndal
The general formalism for calculating the Newtonian potential in fine-tuned or critical Randall-Sundrum braneworlds is outlined. It is based on using the full tensor structure of t…
Dynamics of the scalar field in 5-dimensional Kaluza-Klein theory
Ingunn Kathrine Wehus, Finn Ravndal
Using the language of differential forms, the Kaluza-Klein theory in 4+1 dimensions is derived. This theory unifies electromagnetic and gravitational interactions in four dimension…
Problems with the Casimir Vacuum Energy
Finn Ravndal
A critical look is taken at the calculation of the Casimir effect. The boundary conditions play an important role and should be imposed in a physical way. An acceptable result for…
Relativistic corrections to the Pionium Lifetime
Xinwei Kong, Finn Ravndal
Next to leading order contributions to the pionium lifetime are considered within non-relativistic effective field theory. A more precise determination of the coupling constants is…
Coulomb Effects in Low Energy Proton-Proton Scattering
Xinwei Kong, Finn Ravndal
Using a recently developed effective field theory for the interactions of nucleons at non-relativistic energies, we calculate non-perturbatively Coulomb corrections to proton-proto…
Effective Field Theory of QED Vacuum Fluctuations
Finn Ravndal
Plenary talk at PASCOS-98, Boston, Massachusetts, USA, March 22-29, 1998.
Non-Relativistic Pion Interactions and the Pionium Lifetime
Xinwei Kong, Finn Ravndal
We construct an effective Lagrangian for interacting pions with non-relativistic energies. The coupling constants can be expressed in terms of the different scattering lengths and…
Quantum Corrections to the QED Vacuum Energy
Xinwei Kong, Finn Ravndal
At energies much less than the electron mass the effects of quantum fluctuations in the vacuum due to virtual electron loops can be included by extending the Maxwell Lagrangian…
Radiative Corrections to the Stefan-Boltzmann Law
Finn Ravndal
Photons in blackbody radiation have non-zero interactions due to their couplings to virtual electron-positron pairs in the vacuum. For temperatures much less than the electron mass…
Applications of Effective Lagrangians
Finn Ravndal
Effective Lagrangians were originally used only at the tree level as so-called phenomenological Lagrangians since they were in general non-renormalizable. Today they are treated as…