36 citations · 74 across the 13 of their papers we have counts for
13 papers
Compactification along Lightlike Lattices
Hanno Hammer
Spacetimes obtained by dimensional reduction along lattices containing a lightlike direction can admit semigroup extensions of their isometry groups. We show by concrete examples t…
Determination of the characteristic directions of lossless linear optical elements
Hanno Hammer
We show that the problem of finding the primary and secondary characteristic directions of a linear lossless optical element can be reformulated in terms of an eigenvalue problem r…
Collective states in highly symmetric atomic configurations, and single-photon traps
Hanno Hammer
Abbreviated Abstract: We study correlated states in a circular and linear-chain configuration of identical two-level atoms containing the energy of a single quasi-resonant photon i…
Reconstruction of spatially inhomogeneous dielectric tensors via optical tomography
Hanno Hammer, William R. B. Lionheart
A method to reconstruct weakly anisotropic inhomogeneous dielectric tensors inside a transparent medium is proposed. The mathematical theory of Integral Geometry is cast into a wor…
Collective excitations in circular atomic configurations, and single-photon traps
Hanno Hammer
Correlated excitations in a plane circular configuration of identical atoms with parallel dipole moments are investigated. The collective energy eigenstates, their level shifts and…
Application of Sharafutdinov's Ray Transform in Integrated Photoelasticity
H. Hammer, B. Lionheart
We explain the main concepts centered around Sharafutdinov's ray transform, its kernel, and the extent to which it can be inverted. It is shown how the ray transform emerges natura…