547 citations · 1.4k across the 15 of their papers we have counts for
15 papers
Finite-difference time-domain simulation of strong-field ionization: Perfectly matched layer approach
Høgni C. Kamban, Sigurd S. Christensen, Thomas Søndergaard +1
A Finite-Difference Time-Domain (FDTD) scheme with Perfectly Matched Layers (PMLs) is considered for solving the time-dependent Schrödinger equation, and simulate the ionization of…
Quantum spill-out in nanometer-thin gold slabs: Effect on plasmon mode index and plasmonic absorption
Enok J. H. Skjølstrup, Thomas Søndergaard, Thomas G. Pedersen
A quantum mechanical approach and local response theory are applied to study plasmons propagating in nanometer-thin gold slabs sandwiched between different dielectrics. The metal s…
Quantum spill out in few-nanometer metal gaps: Effect on gap plasmons and reflectance from ultrasharp groove arrays
Enok J. H Skjølstrup, Thomas Søndergaard, Thomas G. Pedersen
Plasmons in ultranarrow metal gaps are highly sensitive to the electron density profile at the metal surfaces. Using a fully quantum mechanical approach, we study the effects of el…
Generalized nonlocal optical response in nanoplasmonics
N. Asger Mortensen, Søren Raza, Martijn Wubs +2
Metallic nanostructures exhibit a multitude of optical resonances associated with localized surface plasmon excitations. Recent observations of plasmonic phenomena at the sub-nanom…
The Complete KLT-Map Between Gravity and Gauge Theories
Poul H. Damgaard, Rijun Huang, Thomas Sondergaard +1
We present the complete map of any pair of super Yang-Mills theories to supergravity theories as dictated by the KLT relations in four dimensions. Symmetries and the full set of as…
Feynman Rules for QCD in Space-Cone Gauge
Alexander Karlberg, Thomas Sondergaard
We present the Lagrangian and Feynman rules for QCD written in space-cone gauge and after eliminating unphysical degrees of freedom from the gluonic sector. The main goal is to cla…
Perturbative Gravity and Gauge Theory Relations -- A Review
Thomas Sondergaard
This review is dedicated to the amazing Kawai-Lewellen-Tye relations, connecting perturbative gravity and gauge theories at tree level. The main focus is on n-point derivations and…
Monodromy--like Relations for Finite Loop Amplitudes
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Henrik Johansson +1
We investigate the existence of relations for finite one-loop amplitudes in Yang-Mills theory. Using a diagrammatic formalism and a remarkable connection between tree and loop leve…
Unusual identities for QCD at tree-level
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Bo Feng +1
We discuss a set of recently discovered quadratic relations between gauge theory amplitudes. Such relations give additional structural simplifications for amplitudes in QCD. Remark…
The Momentum Kernel of Gauge and Gravity Theories
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Thomas Sondergaard +1
We derive an explicit formula for factorizing an -point closed string amplitude into open string amplitudes. Our results are phrased in terms of a momentum kernel which in the l…
Proof of Gravity and Yang-Mills Amplitude Relations
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Bo Feng +1
Using BCFW on-shell recursion techniques, we prove a sequence of explicit n-point Kawai-Lewellen-Tye relations between gravity and Yang-Mills amplitudes at tree level.
New Identities among Gauge Theory Amplitudes
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Bo Feng +1
Color-ordered amplitudes in gauge theories satisfy non-linear identities involving amplitude products of different helicity configurations. We consider the origin of such identitie…
Gravity and Yang-Mills Amplitude Relations
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Bo Feng +1
Using only general features of the S-matrix and quantum field theory, we prove by induction the Kawai-Lewellen-Tye relations that link products of gauge theory amplitudes to gravit…
Monodromy and Jacobi-like Relations for Color-Ordered Amplitudes
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Thomas Sondergaard +1
We discuss monodromy relations between different color-ordered amplitudes in gauge theories. We show that Jacobi-like relations of Bern, Carrasco and Johansson can be introduced in…
New Relations for Gauge-Theory Amplitudes with Matter
Thomas Sondergaard
We extend a recently discovered set of relations for gauge-theory amplitudes to non-gluonic matter. For all MHV amplitudes we find that these can be made to hold for scalar/fermion…